App Development Exam > App Development Videos > Swift in Xcode: The Complete iOS Development Guide > Making a Space Shooter Game (SpriteKit : Part 3 : Swift in Xcode)
Making a Space Shooter Game (SpriteKit : Part 3 : Swift in Xcode) Video Lecture | Swift in Xcode: The Complete iOS Development Guide - App Development
FAQs on Making a Space Shooter Game (SpriteKit : Part 3 : Swift in Xcode) Video Lecture - Swift in Xcode: The Complete iOS Development Guide - App Development
| 1. How do I create a Space Shooter game using SpriteKit in Xcode? |  |
Ans. To create a Space Shooter game using SpriteKit in Xcode, you can follow these steps:
1. Open Xcode and create a new project.
2. Choose the "Game" template and select "SpriteKit" as the technology.
3. Give your project a name and save it.
4. In the GameScene.swift file, you can start coding your game logic, such as creating the player spaceship, enemy spaceships, and handling their movements.
5. Use the SKPhysicsBody class to add physics to your game objects, allowing them to interact with each other.
6. Implement touch or keyboard controls to move the player spaceship and shoot projectiles.
7. Add sound effects and background music to enhance the gaming experience.
8. Test your game by running it on the simulator or a physical device.
| 2. What is SpriteKit and how does it help in developing a Space Shooter game? | |
Ans. SpriteKit is a framework provided by Apple for creating 2D games. It simplifies the development process by providing various tools and features specifically designed for game development. In the context of a Space Shooter game, SpriteKit helps in the following ways:
1. Rendering and Animations: SpriteKit provides a powerful rendering engine that efficiently handles the rendering of sprites and animations in your game.
2. Physics Simulation: SpriteKit includes a physics engine that allows you to create realistic physics-based interactions between game objects, such as collisions, gravity, and forces.
3. Scene Management: SpriteKit manages scenes, which represent different screens or levels in your game. You can easily transition between scenes and manage the elements within each scene.
4. Touch and Input Handling: SpriteKit simplifies the handling of touch events and user input, making it easier to implement controls for your game.
5. Audio Support: SpriteKit provides built-in support for playing sound effects and background music, allowing you to create an immersive gaming experience.
| 3. How can I add shooting functionality to the player spaceship in my Space Shooter game? | |
Ans. To add shooting functionality to the player spaceship in your Space Shooter game, you can follow these steps:
1. Create a method in your GameScene.swift file that handles the shooting action.
2. Inside the shooting method, create a new SKSpriteNode or SKShapeNode to represent the projectile.
3. Set the position of the projectile to the position of the player spaceship.
4. Add the projectile to the scene using the addChild() method.
5. Apply a physics body to the projectile and set its category, contact, and collision bitmask properties to enable collision detection with enemy spaceships or other game objects.
6. Implement a timer or cooldown mechanism to limit the rate of fire for the player spaceship.
7. When the shooting method is called, apply a force or impulse to the projectile in the desired direction to make it move.
8. Handle the collision between the projectile and enemy spaceships to determine if they are hit.
| 4. How can I create enemy spaceships that move and shoot in my Space Shooter game? | |
Ans. To create enemy spaceships that move and shoot in your Space Shooter game, you can follow these steps:
1. Create a method that generates enemy spaceships at regular intervals or based on specific conditions.
2. Inside the enemy generation method, create new SKSpriteNodes to represent the enemy spaceships.
3. Set the initial position of the enemy spaceships randomly within the game scene.
4. Add the enemy spaceships to the scene using the addChild() method.
5. Apply a physics body to the enemy spaceships and set their category, contact, and collision bitmask properties to enable collision detection with the player spaceship or other game objects.
6. Implement a movement logic for the enemy spaceships, such as moving them in a predefined pattern or towards the player spaceship.
7. Implement a shooting logic for the enemy spaceships, similar to the shooting functionality for the player spaceship.
8. Handle collisions between the enemy spaceships' projectiles and the player spaceship to determine if the player is hit.
| 5. How can I implement scoring and game over functionality in my Space Shooter game? | |
Ans. To implement scoring and game over functionality in your Space Shooter game, you can follow these steps:
1. Create a score variable to keep track of the player's score throughout the game.
2. Display the score on the screen using an SKLabelNode or any other appropriate UI element.
3. Increment the score whenever the player destroys an enemy spaceship or achieves a specific milestone in the game.
4. Implement a mechanism to detect when the player's spaceship is hit by an enemy projectile or collides with an enemy spaceship.
5. When the player's spaceship is hit or collides with an enemy spaceship, decrement the player's lives or health points.
6. Check if the player's lives or health points reach zero or a specific threshold to trigger the game over condition.
7. Display a game over message or screen, showing the final score and giving the player an option to restart the game.
8. Implement a restart functionality that resets the game scene, including the player's score, lives, and any other relevant game state variables.
Text Transcript from Video
it took me about like all day to make
this tutorial everybody welcome to part
3 of how to make your own space shooter
game with Swift in Xcode this time we're
going to be dealing with saving high
scores and scores so let's go ahead and
get started first thing we need to do is
open up our Galaga one Xcode project so
let's make this a bit bigger and head
over to our NCS KS now I actually did
this wrong we don't actually want an end
seemed sks we want an NC not Swift file
and this will actually control a view
controller so when you just need a
right-click or can I mean just
right-click on the end scene and click
delete and we're gonna move this to
trash and we're gonna say file new file
go to the source up here for iOS and
we're going to add a swift file and the
swift file we'll just call this end
scene create and now we can make this a
bit new you can just move this down here
and now we have our end scene and our
game scene now first we want to edit our
game scene so that it actually moves
over to our end scene and actually
actually you heard of art here and scene
first so inside of our end scene we want
to import and this will be our sprite
kit and this will allow us to use
certain element elements for our sprite
kit game that we are doing and we just
need to say class and this is going to
be the name of our scene so we're gonna
call this end scene and then we of the
superclass of an SK scene and again this
is also contained inside of the import
that we just did with sprite kit so
class and scene SK scene open curly
braket close curly bracket and inside of
the e so we want to say did move to view
and inside of the Dib move to view which
is going to add an NS log in there for
now just to make sure that we are moving
over to the scene let's head over to our
game seemed up swift and inside of our
collision with enemy I mean our
collision with person right down here we
instead of it saying self dot view dot
presents scene SK scene file
we want to actually just say present
scene and delete everything inside of
there and instead of present scene we
just want to say end scene like so so we
were actually just presenting the SK
scene that we just created right here
you just want to make sure it's the
exact same name as the class over there
so we can just build and run this right
now and once we hit our enemy we are
going to get I mean you know once we hit
our player against our enemy we're going
to move to the other scene that is
exactly what we want so let's head over
to our game our end scene dot Swift and
inside of our end scene that Swift we're
going to change the background color so
we can say scene dot background color
equals UI color dot and we'll just make
this a white color so when the game ends
we are want a white color next thing we
need is a restart button so we can just
save our and you actually we want to
create this right outside of our did
move to view so we can save our this
will be restart BTN for button and this
is going to be equal to so just say : UI
button exclamation point and this will
instantiate that this is a button now
inside of our did move to view we want
to say restart button equals UI button
and this is going to give it the frame
of a cg rekt so we can type in there cg
rekt open parenthesis our x-value we
will set later and our y-value we will
also set later so I'm just going to set
those to zero
our width I'm just going to put this as
200 and our height we're gonna make it
30 if you want to program Ecklie do this
we can actually do this this is probably
the better way to do that we can say
view dot frame dot size divided by and
we'll divide it by three size not width
size dot width divided by three will be
our width of our restart button and the
height of it we're just gonna let's
leave it at 30 I think that's perfectly
fine let's go down here and we're gonna
say restart button dot set title
so we're gonna set the title to just say
restart and this is going to be for the
state UI control state dot normal and
basically all this means is when it's
just sitting there doing nothing when
you're not pressing the button or
anything nothing's happening we will
just have the text said to restart now
let's go down here and we want to say
restart button dot set title color we're
gonna set the color to a UI color dot
dark gray color and this is going to be
again for the control state UI control
state state normal now go down here and
we want to add a target so basically
this is the landing we're wanting to
call some functions off of this so it
gets a restart button dot add target and
the target will be self our action will
be a selector so just type in selector
with capital S open parentheses close
parentheses for control state UI control
actually you for control events and this
is going to be UI control events events
dot touch up inside so once the button
is released after you touch up inside of
it we are going to call a function and
we're just gonna call the function and
we're gonna build it right down here
this will be a function called restart
and then after that open curly braket
close curly bracket now let's head on up
here to our restart button add target
and inside of the selector we just
actually want to say open quotation mark
close quotation mark and inside of these
you just want to type in restart or the
name of the function that you just
created also it is capitalized if it's
capitalized you want to capitalize it
inside of those quotation marks as well
and now lastly for now we need to say
self dot view dot add sub view and this
was going to allow us to add the restart
button into our view so just type in
restart button and we can build and run
this right now and now we should have
our restart button placed inside of
so we can just crash into there and we
have a restart button right up there so
now another thing we need to do is set
our restart button into a specific place
so we can say restart button that Center
will be equal to eg point and the CG
point is going to be an X value so you
can say CG point opened for an x value
of frame dot size dot width divided by
two so we're gonna set this right in the
center of our scene and we also want to
save frame again this should be view V
dot frame dot size dot width and then
over here on our Y value we just want
this to be let's just say view dot frame
dot size dot width and this will be
divided by seven so it's gonna barely be
going down and we can build and run this
right now just to see where our Center
is and we can adjust likewise so let's
go ahead crash in there that looks like
a good place we have restart we can we
click on restart nothing happens because
we didn't put in a Reese anything into
our function for restart so we can
automatically just do this but it's just
saying self dot view dot present scene
and we're going to present the scene
that we had before this is going to be
our game scene with the transition and
this is just going to be an SK
transition dot crossfade with duration
let's set that to one second although we
will change that in just a second I'm
just going to show you that one second
is actually wrong later on we will
change it later to zero point three so
if you want to you can change it to zero
point three right now but one point zero
seconds actually creates an error later
on and then we also want to delete our
restart button as soon as we change this
so we can say restart button dot remove
from super view so now if we built in
ran this right now we should see that
our present scene brings up our game
scene that we had before and when we
collide with it we will have our scene
come up we click restart and it goes
back to our original place now as you
can see I got this air
and it says fatal error unexpectedly
found nilval and wrapping an optional
value now basically the way I see it
right now is there's a two enemies being
built at the same time and that is
because of that longer duration
so as these enemies are being built at
the same time and that we are also
getting one of these is just nil
basically it might look like a enemy but
it's not really an enemy that might not
be the problem I don't exactly know what
is the problem but either way I figured
them out the way to fix this is just go
back and go back to your end scene dot
Swift and say crossfade with duration
and we're gonna just change this down to
0.3 so now if we were to build and run
this right now we should see that we're
getting a faster crossfade for one as we
restart we're getting a faster crossfade
but also we're not getting that error
and I can do this many times and we're
never gonna get that error as far as
I've tried it and now also you can see
that our our background I I just
switched to Peck actually but our
background is is this ugly gray color so
we actually want to change this and
we're gonna make it a nice dark grey
color and then we're going to add some
stars so we can say self dot scene dot
background color will be equal to a UI
color dot dark gray color so now if we
were to build and run this we should see
a dark grey color being built into the
background of our scene as you can see
then it goes over to restart and whatnot
we can head up here to our file and
we're gonna create a new file new file
and this is going to be an a resource
and this will be a sprite kit particle
file click Next and I'm just actually
going to make this snow you can make
this whatever you want it to be really
actually I'm gonna make this magic why
not magic because I think it's gonna
look cool so and our we're gonna save
this as just a magic particle system so
we'll save magic particle we could put
that in there and this is what magic
looks like of course you can go through
all the options such as fire and other
things like that but basically this is
going to be our background so we can
medet the background as much as you want
you can change the particle birth rate
ooh
quite low I think I like this a bit
better to just have it as a nice little
background we can make the lifetime of
each of these just a lot smaller so
they're more twinkling stars so let's do
that just by doing that and then we can
also change the scale so it's going to
start at a fairly small scale so we can
start it at zero and it's going to go to
a range of pretty big like there we can
change the speed of course you can edit
this to your heart's delight but let's
go over back to our game scene dot Swift
and now we're going to add this particle
system on to our scene so this is pretty
simple we can see say self dot add child
and we can add this child which is an SK
emitter node open parentheses our file
named and of course our file name is
magic particle and also make sure
everything is capitalized the way you
want it or else it will not be billed
properly and if we were to build and run
this we will see that actually we need
to edit some of the sizes so as you can
see we build and run and you'll see it's
right in here in the corner which is not
it what we want so let's go back to our
game scene I mean our magic particles
sks and we're gonna say the position
range will range from we'll make this
pretty wide our x value will be twelve
hundred and eighty as that's just double
of six hundred and forty and our Y value
will be just about twenty-two hundred
you can make that whatever you want but
it's just making it a lot bigger now you
can also because the because everything
is a bit smaller now we can also
increase the birth rate a bit more so we
get all these particles on to our scene
and we can build and run this and as you
can see we have a twinkling particle
background in the background so that is
how you would add a particle system onto
your scene as well of course you can
always add an image just by creating a
UI image and putting it in there I'm not
gonna do that
I like this particle system look so now
if I were to go back to our game scene
another thing we want to do is have a
heist
core so in order to do this we would
just take our score and we can we want
to pass it over to our next scene so go
down here to your collision with person
we're gonna create an NS user default so
save var and this will be called our
score will be equal to NS user defaults
dot standard user defaults and we can
say score dot set value set value and
our value will be are the same as our
score that we have so we can just put
that integer right in there and this can
actually be whatever you want it to be
but basically this is going to be placed
into some core data then you want to
grab from the core but using this
specific name that you give it so you
can say scored offset value score for
key and we'll just call this score so
we're gonna grab this score from the NS
user defaults later on so now next thing
we want to do is actually take this
number up here and we want to save it
and if it's larger than a certain number
or the high score then we want to save
it as the high score so in order for us
to do this we can go to our game scene
dot Swift and inside of our game scene
dot Swift we want to go down here with
our collision with person now we want to
inside of our collision with person we
just say bar this will be our score then
this will be X be called score default
you can call it that is equal to NS user
default NS user defaults doubt standard
user defaults and then we're going to
set the score default so score default
set value and the value will be set to a
score so we're passing this score along
inside of our core data with the key
name of score now let's go over to our
end scene and inside of our end scene we
want to go into our did move to view and
inside of this we just want to save our
score default will be equal to will be
equal to stent NS user defaults adopt
standard user defaults and then
a bar and this will be our score will be
equal to score default dot value for key
open parentheses close parentheses and
this is going to be the name of the key
that you gave it back in your game seen
dots if Swift be sure it's capitalized
the same in everything or else it will
not work properly then we want to say as
an NS integer so now if we were to build
and run this right now all right
actually first of all we want to see
that the score is actually being put in
properly so we just need to say NS log
open parentheses close parentheses and
inside of this you just want to say open
quotation mark open close Taoiseach mark
close quotation mark slash open for
disease close parentheses and inside of
these parentheses you just want to say
score and this is going to allow us to
see what exactly the score is I've typed
in 10s log of it wrong now let's build
and run and we should see that we have
our NS log score being built properly
and if we crash into one of these guys
we don't get that we don't get it
working properly course we don't now I'm
actually getting this error because I
did something wrong we need to go over
here to our score default and just click
and drag this right above the all the
rest of our text we could just copy and
we're gonna paste this right before we
say self dot view dot present seen that
is what was wrong because we're moving
to the other scene before we can save
anything so we can build and run this
right now and if we were to hit our
person we would actually see that our
score was 1 so there you have it of we
were grabbing and we're putting this
score as the score so now we want to
take this score and save a high score so
in order for us to do this let's go over
to our game scene dot Swift and first of
all we're gonna create a variable and
this variable will be our high score and
this will be equal to an integer and
then we need to go down here and to our
did move to view and do exactly what we
did with our score and create an NS user
default so we can save our and this will
be our high score default default will
be equal to that will be equal to NS
user defaults dot standard user
defaults and then down here we need to
go down here and say if our high-score
default dot value for key and we haven't
created this key yet but we're going to
make sure that this bit key is empty so
if the high-score default value for key
high-score is not equal to new meaning
that there is something inside of it so
what if there's not equal to nil then we
want to set our high-score equal to our
high-score default value for key
high-score default dot - value for key
and again this will be our high score
and it's going to give you this little
error so we need to say as an NS integer
so we are basically saying this is an
integer and we're making sure that it
knows that the high score is an integer
and if this is false we just want to set
our high score equal to zero so we can
just say high score equals zero because
of course if there's nothing inside of
our NS user defaults that means we
haven't played the game before so we're
automatically going to set our high
score equal to zero and then down here
on our collision with person we need to
say if the score is greater than is
greater than our high score then we want
to run a function so if it's greater
than the high score then we want to save
our high score defaults as you need to
call the high score default every time
you want to use it so save our high
score default is equal to NS user NS
user defaults standard user defaults
then we're going to say high score
default dot set value we're gonna set
the value high score for ki and this is
again oh sorry we're gonna set this
about set the value of score for ki and
this is going to be our open quote each
i'ma close quotation mark high score and
then we need to head over to our end
scene dot Swift and just call this high
score exactly as we did before so go
over to here and your game scene we're
gonna just copy and paste this right
here and put go to our game scene I mean
our end scene swift go down here and
we're gonna create another variable and
we're gonna create this variable
high-score right up here and this is
going to be equal to an integer and then
down here and your VAR high-score
default we need to set our integer to
equal to our high-score default value
for kiya so we can say high-score is
equal to our high-score default dot
high-score default dot value for key I
think this is going to be our high-score
key and again make sure it's capitalized
the way you the way it was or else
you're gonna get this wrong and again
this should be as an NS integer integer
then go down here we're gonna NS log our
high score that we just created NS log
and inside of these parentheses you just
wanted to go slash open for the C's
close parentheses and type in high score
so we're going to call this integer and
make sure what we have the integer that
we want so go down here we can build and
run and let's crash into our enemy and
we should see that our high score is
equal to 4 so there here is our high
score it was stored up from a previous
game that we did before so now if I were
to actually beat this score that we had
before say 5 crash into an enemy or I
guess I had 6 so there we have it
boom our score is equal to 6 and our
high score is equal to 6 and now we also
want to create some labels to go along
with this so we can save our score label
will be equal to UI label UI label open
parenthesis and this is going to be with
the frame of a CG wrecked and we're just
gonna basically make it the same frame
as what we had up here and we're gonna
set the center and then we want to set
the center of the score label so just a
score label dot Center will be equal to
and this will be equal to an XY value so
let's just say CG
point open parentheses and basically
we're gonna take the exact same x and y
values that we had up here so we can
just put those right in there we're
gonna paste that right in there
and inside of this we have our x value
as viewed off framed out sized out width
divided by two so it's gonna be right in
the center and viewed all framed out
size die width divided by and we're
gonna change this to four so it's a
little bit down below and then now we're
gonna take this and we're gonna also
have a highscore label so we can say var
high score label and we're basically
gonna take the exact same thing so we
can actually just copy and paste these
two lines put those right down there
this will be our high score high score
label again high score label dot Center
and this time we're gonna make this
divided by two at the end so we can see
it a bit better then we also want to set
the text of these labels so we can say
score label dot text will be equal to
open / Hotei smart close quotation mark
and slash that we're gonna type in score
and then we're also gonna do the same
down here so we're gonna say high score
dot text I mean high score label dot
text I don't think I'm typing this in
right high score label dot text equal to
this again open quotation mark close
quotation mark and inside of here we're
just gonna put high score so now we have
all those built in there and then we
need to say self dot view dot to add sub
view so we're gonna add the label into
our view we're gonna add the score label
go down here we're gonna do the exact
same thing except with our high score
label so say self dot view dot add sub
view and again this is going to be for
our high score label now if we were to
build and run this we should get all of
our high scores or scores or labels all
building and running inside of our
ending scene so now let's hit and there
you have it there is our score of for
that one and our high score now again
you can play around with the numbers
make sure that you're getting the
correct positioning for everything but
so as you can see the one and the six
were actually carried over to our main
view controller so in order to fix this
let's head over to our end seems whiffed
and we're just gonna take this score
label and make it public so we're gonna
save our score label and we're gonna
erase the variable right over here so
we're gonna just make this score label
and high score label and then up here
where it says restart button and all
this we need to do this right outside of
our override funk did move to view and
save our score label and this will be
equal to a UI label and then exclamation
point are actually : UI label so the
circuit actually be bar score label : UI
label exclamation point and then again
of our high score label : UI label
exclamation point and this is just going
to allow it to be public and it looks
like I named this wrong it should be
high score label with a capital S so now
that made it public and now we can go
down to our restart and we can say high
score label dot to remove from super
view and also score label of dot remove
from super view so now as you can see I
click the restart button and everything
disappears and I have my score up here
and then I hit the my player one six
restart and I can also reset the high
score hit my enemy and boom eight is my
score and now it is my high score that's
it for this tutorial if you enjoyed it
be sure to hit that like button down
below and if you want to see more
tutorials like this rumi in the future
be sure to subscribe if you want to know
more about me be sure to check out the
social links down in the description
down below this is the last tutorial of
this tutorial series of the space
shooters tutorial series so if you have
any couple more comments or questions
you can leave that down in the
description down below and I might make
another tutorial but as for now this is
the end anyway I thought this would be
good enough as you guys can take your
own creative ability and do your own
thing with this tutorial but other than
that thank you all so much for watching
and I will see you in the next one
this tutorial everybody welcome to part
3 of how to make your own space shooter
game with Swift in Xcode this time we're
going to be dealing with saving high
scores and scores so let's go ahead and
get started first thing we need to do is
open up our Galaga one Xcode project so
let's make this a bit bigger and head
over to our NCS KS now I actually did
this wrong we don't actually want an end
seemed sks we want an NC not Swift file
and this will actually control a view
controller so when you just need a
right-click or can I mean just
right-click on the end scene and click
delete and we're gonna move this to
trash and we're gonna say file new file
go to the source up here for iOS and
we're going to add a swift file and the
swift file we'll just call this end
scene create and now we can make this a
bit new you can just move this down here
and now we have our end scene and our
game scene now first we want to edit our
game scene so that it actually moves
over to our end scene and actually
actually you heard of art here and scene
first so inside of our end scene we want
to import and this will be our sprite
kit and this will allow us to use
certain element elements for our sprite
kit game that we are doing and we just
need to say class and this is going to
be the name of our scene so we're gonna
call this end scene and then we of the
superclass of an SK scene and again this
is also contained inside of the import
that we just did with sprite kit so
class and scene SK scene open curly
braket close curly bracket and inside of
the e so we want to say did move to view
and inside of the Dib move to view which
is going to add an NS log in there for
now just to make sure that we are moving
over to the scene let's head over to our
game seemed up swift and inside of our
collision with enemy I mean our
collision with person right down here we
instead of it saying self dot view dot
presents scene SK scene file
we want to actually just say present
scene and delete everything inside of
there and instead of present scene we
just want to say end scene like so so we
were actually just presenting the SK
scene that we just created right here
you just want to make sure it's the
exact same name as the class over there
so we can just build and run this right
now and once we hit our enemy we are
going to get I mean you know once we hit
our player against our enemy we're going
to move to the other scene that is
exactly what we want so let's head over
to our game our end scene dot Swift and
inside of our end scene that Swift we're
going to change the background color so
we can say scene dot background color
equals UI color dot and we'll just make
this a white color so when the game ends
we are want a white color next thing we
need is a restart button so we can just
save our and you actually we want to
create this right outside of our did
move to view so we can save our this
will be restart BTN for button and this
is going to be equal to so just say : UI
button exclamation point and this will
instantiate that this is a button now
inside of our did move to view we want
to say restart button equals UI button
and this is going to give it the frame
of a cg rekt so we can type in there cg
rekt open parenthesis our x-value we
will set later and our y-value we will
also set later so I'm just going to set
those to zero
our width I'm just going to put this as
200 and our height we're gonna make it
30 if you want to program Ecklie do this
we can actually do this this is probably
the better way to do that we can say
view dot frame dot size divided by and
we'll divide it by three size not width
size dot width divided by three will be
our width of our restart button and the
height of it we're just gonna let's
leave it at 30 I think that's perfectly
fine let's go down here and we're gonna
say restart button dot set title
so we're gonna set the title to just say
restart and this is going to be for the
state UI control state dot normal and
basically all this means is when it's
just sitting there doing nothing when
you're not pressing the button or
anything nothing's happening we will
just have the text said to restart now
let's go down here and we want to say
restart button dot set title color we're
gonna set the color to a UI color dot
dark gray color and this is going to be
again for the control state UI control
state state normal now go down here and
we want to add a target so basically
this is the landing we're wanting to
call some functions off of this so it
gets a restart button dot add target and
the target will be self our action will
be a selector so just type in selector
with capital S open parentheses close
parentheses for control state UI control
actually you for control events and this
is going to be UI control events events
dot touch up inside so once the button
is released after you touch up inside of
it we are going to call a function and
we're just gonna call the function and
we're gonna build it right down here
this will be a function called restart
and then after that open curly braket
close curly bracket now let's head on up
here to our restart button add target
and inside of the selector we just
actually want to say open quotation mark
close quotation mark and inside of these
you just want to type in restart or the
name of the function that you just
created also it is capitalized if it's
capitalized you want to capitalize it
inside of those quotation marks as well
and now lastly for now we need to say
self dot view dot add sub view and this
was going to allow us to add the restart
button into our view so just type in
restart button and we can build and run
this right now and now we should have
our restart button placed inside of
so we can just crash into there and we
have a restart button right up there so
now another thing we need to do is set
our restart button into a specific place
so we can say restart button that Center
will be equal to eg point and the CG
point is going to be an X value so you
can say CG point opened for an x value
of frame dot size dot width divided by
two so we're gonna set this right in the
center of our scene and we also want to
save frame again this should be view V
dot frame dot size dot width and then
over here on our Y value we just want
this to be let's just say view dot frame
dot size dot width and this will be
divided by seven so it's gonna barely be
going down and we can build and run this
right now just to see where our Center
is and we can adjust likewise so let's
go ahead crash in there that looks like
a good place we have restart we can we
click on restart nothing happens because
we didn't put in a Reese anything into
our function for restart so we can
automatically just do this but it's just
saying self dot view dot present scene
and we're going to present the scene
that we had before this is going to be
our game scene with the transition and
this is just going to be an SK
transition dot crossfade with duration
let's set that to one second although we
will change that in just a second I'm
just going to show you that one second
is actually wrong later on we will
change it later to zero point three so
if you want to you can change it to zero
point three right now but one point zero
seconds actually creates an error later
on and then we also want to delete our
restart button as soon as we change this
so we can say restart button dot remove
from super view so now if we built in
ran this right now we should see that
our present scene brings up our game
scene that we had before and when we
collide with it we will have our scene
come up we click restart and it goes
back to our original place now as you
can see I got this air
and it says fatal error unexpectedly
found nilval and wrapping an optional
value now basically the way I see it
right now is there's a two enemies being
built at the same time and that is
because of that longer duration
so as these enemies are being built at
the same time and that we are also
getting one of these is just nil
basically it might look like a enemy but
it's not really an enemy that might not
be the problem I don't exactly know what
is the problem but either way I figured
them out the way to fix this is just go
back and go back to your end scene dot
Swift and say crossfade with duration
and we're gonna just change this down to
0.3 so now if we were to build and run
this right now we should see that we're
getting a faster crossfade for one as we
restart we're getting a faster crossfade
but also we're not getting that error
and I can do this many times and we're
never gonna get that error as far as
I've tried it and now also you can see
that our our background I I just
switched to Peck actually but our
background is is this ugly gray color so
we actually want to change this and
we're gonna make it a nice dark grey
color and then we're going to add some
stars so we can say self dot scene dot
background color will be equal to a UI
color dot dark gray color so now if we
were to build and run this we should see
a dark grey color being built into the
background of our scene as you can see
then it goes over to restart and whatnot
we can head up here to our file and
we're gonna create a new file new file
and this is going to be an a resource
and this will be a sprite kit particle
file click Next and I'm just actually
going to make this snow you can make
this whatever you want it to be really
actually I'm gonna make this magic why
not magic because I think it's gonna
look cool so and our we're gonna save
this as just a magic particle system so
we'll save magic particle we could put
that in there and this is what magic
looks like of course you can go through
all the options such as fire and other
things like that but basically this is
going to be our background so we can
medet the background as much as you want
you can change the particle birth rate
ooh
quite low I think I like this a bit
better to just have it as a nice little
background we can make the lifetime of
each of these just a lot smaller so
they're more twinkling stars so let's do
that just by doing that and then we can
also change the scale so it's going to
start at a fairly small scale so we can
start it at zero and it's going to go to
a range of pretty big like there we can
change the speed of course you can edit
this to your heart's delight but let's
go over back to our game scene dot Swift
and now we're going to add this particle
system on to our scene so this is pretty
simple we can see say self dot add child
and we can add this child which is an SK
emitter node open parentheses our file
named and of course our file name is
magic particle and also make sure
everything is capitalized the way you
want it or else it will not be billed
properly and if we were to build and run
this we will see that actually we need
to edit some of the sizes so as you can
see we build and run and you'll see it's
right in here in the corner which is not
it what we want so let's go back to our
game scene I mean our magic particles
sks and we're gonna say the position
range will range from we'll make this
pretty wide our x value will be twelve
hundred and eighty as that's just double
of six hundred and forty and our Y value
will be just about twenty-two hundred
you can make that whatever you want but
it's just making it a lot bigger now you
can also because the because everything
is a bit smaller now we can also
increase the birth rate a bit more so we
get all these particles on to our scene
and we can build and run this and as you
can see we have a twinkling particle
background in the background so that is
how you would add a particle system onto
your scene as well of course you can
always add an image just by creating a
UI image and putting it in there I'm not
gonna do that
I like this particle system look so now
if I were to go back to our game scene
another thing we want to do is have a
heist
core so in order to do this we would
just take our score and we can we want
to pass it over to our next scene so go
down here to your collision with person
we're gonna create an NS user default so
save var and this will be called our
score will be equal to NS user defaults
dot standard user defaults and we can
say score dot set value set value and
our value will be are the same as our
score that we have so we can just put
that integer right in there and this can
actually be whatever you want it to be
but basically this is going to be placed
into some core data then you want to
grab from the core but using this
specific name that you give it so you
can say scored offset value score for
key and we'll just call this score so
we're gonna grab this score from the NS
user defaults later on so now next thing
we want to do is actually take this
number up here and we want to save it
and if it's larger than a certain number
or the high score then we want to save
it as the high score so in order for us
to do this we can go to our game scene
dot Swift and inside of our game scene
dot Swift we want to go down here with
our collision with person now we want to
inside of our collision with person we
just say bar this will be our score then
this will be X be called score default
you can call it that is equal to NS user
default NS user defaults doubt standard
user defaults and then we're going to
set the score default so score default
set value and the value will be set to a
score so we're passing this score along
inside of our core data with the key
name of score now let's go over to our
end scene and inside of our end scene we
want to go into our did move to view and
inside of this we just want to save our
score default will be equal to will be
equal to stent NS user defaults adopt
standard user defaults and then
a bar and this will be our score will be
equal to score default dot value for key
open parentheses close parentheses and
this is going to be the name of the key
that you gave it back in your game seen
dots if Swift be sure it's capitalized
the same in everything or else it will
not work properly then we want to say as
an NS integer so now if we were to build
and run this right now all right
actually first of all we want to see
that the score is actually being put in
properly so we just need to say NS log
open parentheses close parentheses and
inside of this you just want to say open
quotation mark open close Taoiseach mark
close quotation mark slash open for
disease close parentheses and inside of
these parentheses you just want to say
score and this is going to allow us to
see what exactly the score is I've typed
in 10s log of it wrong now let's build
and run and we should see that we have
our NS log score being built properly
and if we crash into one of these guys
we don't get that we don't get it
working properly course we don't now I'm
actually getting this error because I
did something wrong we need to go over
here to our score default and just click
and drag this right above the all the
rest of our text we could just copy and
we're gonna paste this right before we
say self dot view dot present seen that
is what was wrong because we're moving
to the other scene before we can save
anything so we can build and run this
right now and if we were to hit our
person we would actually see that our
score was 1 so there you have it of we
were grabbing and we're putting this
score as the score so now we want to
take this score and save a high score so
in order for us to do this let's go over
to our game scene dot Swift and first of
all we're gonna create a variable and
this variable will be our high score and
this will be equal to an integer and
then we need to go down here and to our
did move to view and do exactly what we
did with our score and create an NS user
default so we can save our and this will
be our high score default default will
be equal to that will be equal to NS
user defaults dot standard user
defaults and then down here we need to
go down here and say if our high-score
default dot value for key and we haven't
created this key yet but we're going to
make sure that this bit key is empty so
if the high-score default value for key
high-score is not equal to new meaning
that there is something inside of it so
what if there's not equal to nil then we
want to set our high-score equal to our
high-score default value for key
high-score default dot - value for key
and again this will be our high score
and it's going to give you this little
error so we need to say as an NS integer
so we are basically saying this is an
integer and we're making sure that it
knows that the high score is an integer
and if this is false we just want to set
our high score equal to zero so we can
just say high score equals zero because
of course if there's nothing inside of
our NS user defaults that means we
haven't played the game before so we're
automatically going to set our high
score equal to zero and then down here
on our collision with person we need to
say if the score is greater than is
greater than our high score then we want
to run a function so if it's greater
than the high score then we want to save
our high score defaults as you need to
call the high score default every time
you want to use it so save our high
score default is equal to NS user NS
user defaults standard user defaults
then we're going to say high score
default dot set value we're gonna set
the value high score for ki and this is
again oh sorry we're gonna set this
about set the value of score for ki and
this is going to be our open quote each
i'ma close quotation mark high score and
then we need to head over to our end
scene dot Swift and just call this high
score exactly as we did before so go
over to here and your game scene we're
gonna just copy and paste this right
here and put go to our game scene I mean
our end scene swift go down here and
we're gonna create another variable and
we're gonna create this variable
high-score right up here and this is
going to be equal to an integer and then
down here and your VAR high-score
default we need to set our integer to
equal to our high-score default value
for kiya so we can say high-score is
equal to our high-score default dot
high-score default dot value for key I
think this is going to be our high-score
key and again make sure it's capitalized
the way you the way it was or else
you're gonna get this wrong and again
this should be as an NS integer integer
then go down here we're gonna NS log our
high score that we just created NS log
and inside of these parentheses you just
wanted to go slash open for the C's
close parentheses and type in high score
so we're going to call this integer and
make sure what we have the integer that
we want so go down here we can build and
run and let's crash into our enemy and
we should see that our high score is
equal to 4 so there here is our high
score it was stored up from a previous
game that we did before so now if I were
to actually beat this score that we had
before say 5 crash into an enemy or I
guess I had 6 so there we have it
boom our score is equal to 6 and our
high score is equal to 6 and now we also
want to create some labels to go along
with this so we can save our score label
will be equal to UI label UI label open
parenthesis and this is going to be with
the frame of a CG wrecked and we're just
gonna basically make it the same frame
as what we had up here and we're gonna
set the center and then we want to set
the center of the score label so just a
score label dot Center will be equal to
and this will be equal to an XY value so
let's just say CG
point open parentheses and basically
we're gonna take the exact same x and y
values that we had up here so we can
just put those right in there we're
gonna paste that right in there
and inside of this we have our x value
as viewed off framed out sized out width
divided by two so it's gonna be right in
the center and viewed all framed out
size die width divided by and we're
gonna change this to four so it's a
little bit down below and then now we're
gonna take this and we're gonna also
have a highscore label so we can say var
high score label and we're basically
gonna take the exact same thing so we
can actually just copy and paste these
two lines put those right down there
this will be our high score high score
label again high score label dot Center
and this time we're gonna make this
divided by two at the end so we can see
it a bit better then we also want to set
the text of these labels so we can say
score label dot text will be equal to
open / Hotei smart close quotation mark
and slash that we're gonna type in score
and then we're also gonna do the same
down here so we're gonna say high score
dot text I mean high score label dot
text I don't think I'm typing this in
right high score label dot text equal to
this again open quotation mark close
quotation mark and inside of here we're
just gonna put high score so now we have
all those built in there and then we
need to say self dot view dot to add sub
view so we're gonna add the label into
our view we're gonna add the score label
go down here we're gonna do the exact
same thing except with our high score
label so say self dot view dot add sub
view and again this is going to be for
our high score label now if we were to
build and run this we should get all of
our high scores or scores or labels all
building and running inside of our
ending scene so now let's hit and there
you have it there is our score of for
that one and our high score now again
you can play around with the numbers
make sure that you're getting the
correct positioning for everything but
so as you can see the one and the six
were actually carried over to our main
view controller so in order to fix this
let's head over to our end seems whiffed
and we're just gonna take this score
label and make it public so we're gonna
save our score label and we're gonna
erase the variable right over here so
we're gonna just make this score label
and high score label and then up here
where it says restart button and all
this we need to do this right outside of
our override funk did move to view and
save our score label and this will be
equal to a UI label and then exclamation
point are actually : UI label so the
circuit actually be bar score label : UI
label exclamation point and then again
of our high score label : UI label
exclamation point and this is just going
to allow it to be public and it looks
like I named this wrong it should be
high score label with a capital S so now
that made it public and now we can go
down to our restart and we can say high
score label dot to remove from super
view and also score label of dot remove
from super view so now as you can see I
click the restart button and everything
disappears and I have my score up here
and then I hit the my player one six
restart and I can also reset the high
score hit my enemy and boom eight is my
score and now it is my high score that's
it for this tutorial if you enjoyed it
be sure to hit that like button down
below and if you want to see more
tutorials like this rumi in the future
be sure to subscribe if you want to know
more about me be sure to check out the
social links down in the description
down below this is the last tutorial of
this tutorial series of the space
shooters tutorial series so if you have
any couple more comments or questions
you can leave that down in the
description down below and I might make
another tutorial but as for now this is
the end anyway I thought this would be
good enough as you guys can take your
own creative ability and do your own
thing with this tutorial but other than
that thank you all so much for watching
and I will see you in the next one
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Dec 23, 2024 Last updated |
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