App Development Exam > App Development Videos > Swift in Xcode: The Complete iOS Development Guide > Making a Space Shooter Game (SpriteKit : Part 1 : Swift in Xcode)
Making a Space Shooter Game (SpriteKit Part 1 Swift in Xcode) Video Lecture
FAQs on Making a Space Shooter Game (SpriteKit : Part 1 : Swift in Xcode)
| 1. How do I create a space shooter game using SpriteKit in Swift and Xcode? |  |
Ans. To create a space shooter game using SpriteKit in Swift and Xcode, you can follow these steps: 1. Open Xcode and create a new project. 2. Choose the iOS template and select the "Game" option. 3. Give your project a name and set the language to Swift. 4. Select SpriteKit as the game technology. 5. Click "Next" and choose the location to save your project. 6. Once the project is created, you can start building your space shooter game using the SpriteKit framework and Swift programming language.
| 2. How can I add a spaceship sprite to my space shooter game? | |
Ans. To add a spaceship sprite to your space shooter game, you can follow these steps: 1. Prepare an image of a spaceship that you want to use in your game. 2. Add the spaceship image to your Xcode project by dragging and dropping it into the project navigator. 3. In your game scene's code, create a new SKSpriteNode instance using the spaceship image. 4. Set the position and size of the spaceship sprite as per your requirements. 5. Add the spaceship sprite to your game scene by using the `addChild()` method.
| 3. How can I make my spaceship shoot projectiles in the space shooter game? | |
Ans. To make your spaceship shoot projectiles in the space shooter game, you can follow these steps: 1. Create a new SKSpriteNode instance for the projectile sprite using your desired image. 2. Set the position of the projectile sprite relative to your spaceship. 3. Add the projectile sprite as a child of your game scene. 4. Create an action to move the projectile sprite upwards towards the top of the screen. 5. Attach the action to the projectile sprite using the `run()` method, so it starts moving when the spaceship shoots. 6. Handle the shooting event (e.g., when the player taps the screen) to create and shoot the projectile.
| 4. How can I detect collisions between the spaceship and enemy sprites in the space shooter game? | |
Ans. To detect collisions between the spaceship and enemy sprites in the space shooter game, you can follow these steps: 1. Set up physics bodies for both the spaceship and enemy sprites using the `physicsBody` property. 2. Configure the physics bodies with appropriate sizes and shapes to match the visual representation of the sprites. 3. Enable physics simulation for your game scene by setting its `physicsWorld` property. 4. Set the `contactTestBitMask` property of your spaceship's physics body to include the category of enemy sprites. 5. Implement the `didBegin(_:)` method of your game scene's physics contact delegate to handle the collision events. 6. In the `didBegin(_:)` method, check for collisions between the spaceship and enemy sprites using the contact's `bodyA` and `bodyB` properties.
| 5. How can I implement a scoring system in the space shooter game? | |
Ans. To implement a scoring system in the space shooter game, you can follow these steps: 1. Create a score variable in your game scene's code, e.g., `var score = 0`. 2. Display the score on the screen using an SKLabelNode or any other appropriate visual element. 3. Increment the score variable whenever the player destroys an enemy sprite. 4. Update the displayed score whenever the score variable changes. 5. Optionally, save the high score using UserDefaults or any other persistent storage mechanism. 6. Retrieve and display the high score on the screen, comparing it to the current score.
Text Transcript from Video
hey everybody today I'm going to show
you how to make a space shooter game
with Swift and Xcode now I actually made
this game myself this is the what the
whole project is I've made this game and
I put it on the App Store and I'm going
to show you how to make it with Swift
and Xcode I originally made it about two
years ago using GameSalad and haven't
updated it since so it's very bad I'm
just gonna warn you that right now but
either way I'm going to show you how to
make that game so let's go ahead and get
started so this is what we're going to
accomplish in this tutorial I just had
my main player right here and out from
him is falling spawning a bunch of
bullets at a certain interval and then
we have an enemy spawning randomly off
of the x axis right from the Y value up
here so let's go ahead and get started
alright first thing we need to do is
open up Pixelmator which is my given
which is my choice editor so I go file
new and I'm going to create a custom
custom size of a 60 by 80 pixels so 60
by 80 pixels image and this is going to
be our player now I'm just going to
option zoom in I'm going to make this
fairly quick and it's just going to be a
nice triangle as our player so now I'm
going to go down here to my objects and
just click and drag a triangle on there
of course if you are using whatever
editing software you use I use
Pixelmator but you can use whatever you
want just the same basic concept applied
throughout so I just have my player like
so and I'm going to change the color of
them to just a nice blue color and I'm
also wanting to make this an 8-bit game
so I can go convert pixels and I'm just
going to add a pixel 8 on to it that
looks pretty good to me
so now if we take this we can erase the
white background and then you want to
export as a PNG and this will assure
that the white there's no white
background in it is because if you were
to do a JPEG it would actually keep a
white background so we need to just say
call this player and this will be our
player Galaga
export and now we need to go file new or
actually we don't need a new one yet
this will our enemy will actually be
around the same size as this guy so we
can just add another triangle flip them
upside down if I can get ahold of them
flip them upside down we're just going
to add a nice orange to him or her
whatever gender is so now we have this
orange one right here and we can make
this a bit bigger and then we're also
going to pixelate this one so right
click convert to pixels and pixelate so
there we have it there is our enemy I
don't know I did a very rough draft
we're going to export this as our PNG
and this will be our enemy for Galaga
and now lastly we need to create our
spike or our bullet so we need to say
file new and this is just going to be a
very small 20 by 40 image pixels per
image click OK and now we just have this
very small bullet let's zoom in real
quick add another triangle and we're
just going to make this a nice purple
first thing that came to mind all right
so we have our bullet right here and we
can go file export and we're going to
export this as a PNG again and this is
going to be our bullet Galaga
of course you can name these whatever
you want I will also have these all
linked on my website if you want to go
download them but now I have the player
enemy and Galaga so let's go ahead go to
Xcode and we want to create a new Xcode
project this is going to be our game so
application and this is going to be a
game click Next our language will be set
to Swift our devices will be set to
iPhone and our game technology will be
set to sprite kit not seen kit as that's
3d OpenGL ES we're not going to mess
with that either and metal that's also
3d now go up here to your product name
and we're just going to type in
- or Galaga one and then create and now
let's make this a bit bigger and let's
head into our game scene dot Swift now
if we were to build and run this right
now you would actually have a pre-built
application running built and running
for you I'm sure you all have seen this
before but when you click on the screen
you get you'll have a hello world and
then you also have all of the spaceships
created at the location of your touch
now we need to actually just go into our
game scene dot Swift first end or
program we need to go into our game
scene but swift and erase everything
inside of our did move to view as this
is basically the viewdidload so when the
view loads something's going to happen
and then in our touches began we want to
release erase everything except for the
let location touch location in node we
just want to keep everything else so
there you have it and now let's go ahead
up here and we're going to create our
first sprite which is going to be our
player so we can save our player equals
SK sprite node open open parentheses and
this is going to be 8th in an image and
image named and then our image name we
just need to click and drag all three of
our images into the supporting files or
you can click and drag them anywhere
really but into the supporting files and
now we have these three images and now
if we just take this image we want the
player Galaga so if we go into game
scene dot Swift go to the image named we
just want to say open and quotation mark
close quotation mark and say player
Galaga dot PNG now down here in the did
move to view we want to add this player
onto our scene so you just say self dot
add child and this is going to be our
player now we also want to change the
aspects of our player back so we
actually build him and run him in the
exact location that we want him to be at
so we can say player dot location I'm
sorry dot position will be equal to CG
point
make and this will be our x and y value
and we're dealing with the game scene
SKS which is different than our main dot
storyboard just dealing differently with
these we we need to go to our game day
game scene dot Swift and inside of the
CG point we need to say our X will be
self dot size dot width divided by two
so this is going to be our x value and
our Y value will be equal to our self
dot size our self dot size dot height
height divided by five just kind of
pulling that one out of my head but this
was basically going to keep it down
below where you would typically be
playing at so now if we were to build
and run this we have our person being
built in ran and he's down here now of
course if you want to move them down you
can say divided by six or so on and so
forth so if we build and run that again
it'll be healed will be moved down more
anyway
we can I'm just going to move them back
to divided by five and inside it touches
began we want to move our player
position equal to wherever we touched so
in order to do this you just say player
dot position is equal to and this will
be our location dot X now I forgot to
mention that this should be player dot
position dot why I mean X so now where
I'm getting this location dot X is from
right up here where we if you didn't
delete it this is good because now we
have our X location automatically being
put inside of this location file and
with anywhere we click he's going to
move to that X location and also I can
click up here and he's still going to
stay in that same spot now we can go
back to here and one thing you'll notice
is I can click but I can't move the
image around which is bad so we need to
go down here and we want to say begin
I'm sorry touches touches moved and we
want to basically just copy and paste
this exact piece of code inside of our
touches moved so we can build and run
this
and as you will see we have our player
and you can touch and move him around
and now we want to actually spawn some
bullets from our players guns per se so
we can save function so f UNC and we're
going to type in spawn our our bullet so
spawn bullets and then open parentheses
close parentheses open pro curly mark
close curly bracket and inside of these
spawn bullets we want to create a bullet
object so we need to do basically what
exactly what we did right up here where
we said var player equals SK and up
sprite node we need to save our our
bullet so we're going to call this a
bullet equals an SK sprite node and this
is going to be an image named and this
will be equal to the image named our
bullet Galaga dot PNG so bullet Galaga
dot PNG and also make sure that it's
capitalized the same way and because
it's not going to work now down here we
want to say bullet dot Z position if you
don't know anything about 3d programming
basically it's just putting it behind an
object or in front of an object
depending on its Z position so this
player sprite node is automatically
built at a Z position of 0 now if we
move this behind 0 we can automatically
make the bullet seem like it's coming
from behind the enemy from our player
ship so you can say bullet dot Z
position equals negative 5 and this is
going to give it the illusion that it's
right behind it was built inside of our
ship now inside of this spawned bullets
we also want to say bullet dot position
will be equal to our CG point make and
our point make we're going to make this
point it the same as our player dot
position X and our player dot position
dot Y and now that we have those done we
can build and run actually we can't
build and run this chest yet because if
you were to build and run nothing would
happen so down here we want to say self
dot add child
and this will be our the same as our our
bullet that we created run up here so
we're adding this child on to our scene
now up here in our did move to view we
also want to create a timer so this
timer will just say that we're going to
save our timer is equal to NS timer dot
scheduled timer with time interval and
this time interval will be equal to zero
point we'll say 2 and our invocation
will be actually we we don't want this
one we want to say scheduled timer with
interval open curly braket like an
interval open curly bracket and we want
this one that's a TI target selector we
don't want the bundle above that so in
this one our time interval will be zero
point two our target will be self
meaning that we're going to be affecting
the scene itself and then our selector
we're going to say selector and
basically what the selector is meaning
is what is it going to call every point
two seconds what function is it going to
call every point two seconds now you
might think that this is good idea to
just take this spawn bullets and put it
right inside of our selector it looks
like it's working fine but it never does
I don't understand why it doesn't give
any errors but in here you will have the
user info we'll put this as nil and our
repeats as true now if you were to build
and run this right now you wouldn't get
any errors but you would be there are
some problems actually would get errors
I was wrong now let's go back to our
game scene dot Swift and hit on two over
to our spawn bullets it's not telling us
that we have an earth that's what I made
them at it's not telling us that we have
an error but there is an error so we
need to go down here to our selector and
just erase the parentheses that's around
our spawn bullets and say open group
open quotation mark close quotation mark
before the spawn bullet so it just
highlights it in red and now if we were
to build and run this we will have a
scheduled timer at running every point
two seconds building and running our
bullets at the point of our player dot
position now we actually need to make
this bullet fly forward so it's actually
going to be able to hit some of the
objects and
just laying down where it normally was
so in sort of in order to do this inside
of our spawn bullets we want to create
an action so it's a let action equal SK
action dot move to Y so we're going to
move to a y-value or a different Y
position for our bullet and the Y
position that we want it to go to is
self dot position
I'm sorry self dot size dot height in
our duration we'll just make this very
quick so we're going to make it go at a
speed of zero point zero point six
sounds good and then down here out
there's actually an error around with
this but I'll show you exactly how to
fix that in just a minute but press
ENTER and below the action we want to
add this action actually to our bullet
so it moved to this Y value with their
duration of 0.6 so in order to do this
you just say enemy I mean sorry bullet
getting mixed up your bullet dot run
action and this will be SK action dot to
repeat action forever and the action is
the action that we just created so we're
going to repeat this action that we just
created like so so now if we want to
build and run this we will have a our
bullets flying up and now as you can see
if you look at our nodes right down here
we are getting this just piling up with
the amount of nodes that we have and we
don't want this to happen either so in
order to do this there's a couple ways
you can do this
my favorite way is actually just getting
it to go off the scene so in order to do
this you just set the duration we'll set
it to a 1.0 so it's one second and then
we're going to add 30 pixels to on to
our scene like so and now this is
actually because it's going out of the
scene that's very nice about game scene
dot Swift about this sprite kit as soon
as it goes out of the scene it actually
destroys the node itself so now we
actually have a our bullets flying and
we can move our player all around so
yeah and now let's create our enemies
so in order to create some enemies we
need to create a new function I'm going
to end this process real quick so we
need to say function spawn enemies open
parentheses close parentheses open
quotation open curly braket close curly
bracket and inside of spawn enemies we
just save our enemy equals SK sprite
node and this is going to be image named
again and we're going to just fill in
our image in this is going to be enemy
Galaga as we have done before in the
past dot PNG so the trick with our enemy
is we want to take our enemy and we want
to spawn it at different X values along
this top y axis so in order to do this
you just need to go down here and say
our minimum this is going to be our
minimum value so actually we need to
save our minimum value is equals self is
equal to self dot size dot width so
we're taking the screen size and then
we're going to divide this by eight or
divided by eight like so and then our
maximum value we just need to save our
max value will be equal to self dot size
dot width and then we're going to
subtract 20 from that width so it
actually doesn't go off the scene this
will be helpful for later on and then
down here we need to take our var and
this will be basically the difference or
our main spawning point or our spawn
point will be equal to our maximum value
so we're taking the difference and we
just say maximum value minus the minimum
value and we're also going to convert
this to a UI int so UI int 32 like so
the main purpose of the UI in 32 is that
there are 32 bits that are going to be
stored in this and that's going to allow
for more precision in the placement of
things so when you just need to say
enemy dots position equals CG point and
then open
open bracket or open parentheses and
this will be X Y our x value will be
equal to our spawn point randomly chosen
so in order to do this you just say CG
float so CG float open parenthesis and
this is going to be random or arc sorry
arc for random underscore uniform this
is going to be our UI and 32 that we
just created right up here so and so
just type in spawn point like so and
then our Y value will be equal to our
self dot size dot height so now if we
were to we can't build and run this
chest yet because we need to add this
enemy T onto our scene in order to do
this you just say self dot add child and
this is going to be our enemy that we
just created so we're adding this child
onto our scene so now we want to go into
our did move to view and spawn our enemy
that we just created so in order to do
this we basically do exactly what we did
with the bullets by just saying var this
will be our enemy timer is equal to r NS
timer dot scheduled timer i spelt timer
wrong that's why it's not coming up dot
scheduled timer with time interval and
make sure it's the tire target selector
user info and repeats our time interval
i'm just going to make this every one
second our target will be equal to self
so we're going to send our timer over to
our game scene dot swift and then our
selector will be our again our selector
just type that in open parentheses close
parentheses open quotation my close
quotation mark take the name of this
copy and paste that in and this will be
our spawn enemies so now we're going to
spawn our function or at call this
function every one second userinfo nil
we don't want anything and the repeat
equals true so now if we were to build
and run this we would have our enemy
spawning at
in places along the top as you can see
they're not moving this is the exact
problem that we did with our bullets so
we need to go down here to our spawn
enemies and we need to create some
actions so we say let action equal and
our action will be equal to an SK action
dot move to Y and our Y value will be
equal to negative 30 as we want to just
go we want it to just go right out of
the scene and our duration will be
pretty slow we're going to make it three
seconds and now we're going to add the
action this action onto our enemy so we
just say enemy dot run action and this
is going to be SK action dot repeat
action forever and we're going to repeat
this action that we created like so and
now we're going to build and run and now
we should see our enemy just coming down
on us so now as you can see we have our
enemies and they're coming down on us
now of course the bullets aren't working
that will be done in part two of this
video tutorial series but as you will
see we have our player coming down
they're coming at a quite slow rate and
they would that is perfect now I am
seeing that this is spot piling up down
here so we're getting more and more
nodes every second we don't want that
because that reduces frame right so go
down here and we want to just increase
this move to Y just to 70 we'll just say
so we can build and run this again and
as you will see we have our player
moving down the scene like so and easy
racing every time if you watch the nodes
and now if you want to change the
duration at which our enemies come down
you can just or how fast the enemies
come down you can go to this action and
we can change the duration to just a two
seconds and that'll make it come down a
bit faster like so so that's going to
make it come down a bit faster and make
it a bit harder and if you want you can
also go up here to your spawn bullets
and also if you want to spawn more
enemies you can always come up here to
your enemy timer and we can change this
to up to a 0.5
and we'll we can spawn our bullets a bit
faster as well by just changing those
time intervals so we can build and run
those I like so and now we had those
bullets all running and now if you want
to speed up the bullets you can also
just set the duration of our action
right here to a zero so in 0.5 seconds
we want our bullets to hit up there hit
the top of the scene we can do so there
you have it that is very fast but you
might like that you might have a
fast-paced type of game anyway that is
it for this tutorial if you enjoyed it
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next one
hey everybody
you how to make a space shooter game
with Swift and Xcode now I actually made
this game myself this is the what the
whole project is I've made this game and
I put it on the App Store and I'm going
to show you how to make it with Swift
and Xcode I originally made it about two
years ago using GameSalad and haven't
updated it since so it's very bad I'm
just gonna warn you that right now but
either way I'm going to show you how to
make that game so let's go ahead and get
started so this is what we're going to
accomplish in this tutorial I just had
my main player right here and out from
him is falling spawning a bunch of
bullets at a certain interval and then
we have an enemy spawning randomly off
of the x axis right from the Y value up
here so let's go ahead and get started
alright first thing we need to do is
open up Pixelmator which is my given
which is my choice editor so I go file
new and I'm going to create a custom
custom size of a 60 by 80 pixels so 60
by 80 pixels image and this is going to
be our player now I'm just going to
option zoom in I'm going to make this
fairly quick and it's just going to be a
nice triangle as our player so now I'm
going to go down here to my objects and
just click and drag a triangle on there
of course if you are using whatever
editing software you use I use
Pixelmator but you can use whatever you
want just the same basic concept applied
throughout so I just have my player like
so and I'm going to change the color of
them to just a nice blue color and I'm
also wanting to make this an 8-bit game
so I can go convert pixels and I'm just
going to add a pixel 8 on to it that
looks pretty good to me
so now if we take this we can erase the
white background and then you want to
export as a PNG and this will assure
that the white there's no white
background in it is because if you were
to do a JPEG it would actually keep a
white background so we need to just say
call this player and this will be our
player Galaga
export and now we need to go file new or
actually we don't need a new one yet
this will our enemy will actually be
around the same size as this guy so we
can just add another triangle flip them
upside down if I can get ahold of them
flip them upside down we're just going
to add a nice orange to him or her
whatever gender is so now we have this
orange one right here and we can make
this a bit bigger and then we're also
going to pixelate this one so right
click convert to pixels and pixelate so
there we have it there is our enemy I
don't know I did a very rough draft
we're going to export this as our PNG
and this will be our enemy for Galaga
and now lastly we need to create our
spike or our bullet so we need to say
file new and this is just going to be a
very small 20 by 40 image pixels per
image click OK and now we just have this
very small bullet let's zoom in real
quick add another triangle and we're
just going to make this a nice purple
first thing that came to mind all right
so we have our bullet right here and we
can go file export and we're going to
export this as a PNG again and this is
going to be our bullet Galaga
of course you can name these whatever
you want I will also have these all
linked on my website if you want to go
download them but now I have the player
enemy and Galaga so let's go ahead go to
Xcode and we want to create a new Xcode
project this is going to be our game so
application and this is going to be a
game click Next our language will be set
to Swift our devices will be set to
iPhone and our game technology will be
set to sprite kit not seen kit as that's
3d OpenGL ES we're not going to mess
with that either and metal that's also
3d now go up here to your product name
and we're just going to type in
- or Galaga one and then create and now
let's make this a bit bigger and let's
head into our game scene dot Swift now
if we were to build and run this right
now you would actually have a pre-built
application running built and running
for you I'm sure you all have seen this
before but when you click on the screen
you get you'll have a hello world and
then you also have all of the spaceships
created at the location of your touch
now we need to actually just go into our
game scene dot Swift first end or
program we need to go into our game
scene but swift and erase everything
inside of our did move to view as this
is basically the viewdidload so when the
view loads something's going to happen
and then in our touches began we want to
release erase everything except for the
let location touch location in node we
just want to keep everything else so
there you have it and now let's go ahead
up here and we're going to create our
first sprite which is going to be our
player so we can save our player equals
SK sprite node open open parentheses and
this is going to be 8th in an image and
image named and then our image name we
just need to click and drag all three of
our images into the supporting files or
you can click and drag them anywhere
really but into the supporting files and
now we have these three images and now
if we just take this image we want the
player Galaga so if we go into game
scene dot Swift go to the image named we
just want to say open and quotation mark
close quotation mark and say player
Galaga dot PNG now down here in the did
move to view we want to add this player
onto our scene so you just say self dot
add child and this is going to be our
player now we also want to change the
aspects of our player back so we
actually build him and run him in the
exact location that we want him to be at
so we can say player dot location I'm
sorry dot position will be equal to CG
point
make and this will be our x and y value
and we're dealing with the game scene
SKS which is different than our main dot
storyboard just dealing differently with
these we we need to go to our game day
game scene dot Swift and inside of the
CG point we need to say our X will be
self dot size dot width divided by two
so this is going to be our x value and
our Y value will be equal to our self
dot size our self dot size dot height
height divided by five just kind of
pulling that one out of my head but this
was basically going to keep it down
below where you would typically be
playing at so now if we were to build
and run this we have our person being
built in ran and he's down here now of
course if you want to move them down you
can say divided by six or so on and so
forth so if we build and run that again
it'll be healed will be moved down more
anyway
we can I'm just going to move them back
to divided by five and inside it touches
began we want to move our player
position equal to wherever we touched so
in order to do this you just say player
dot position is equal to and this will
be our location dot X now I forgot to
mention that this should be player dot
position dot why I mean X so now where
I'm getting this location dot X is from
right up here where we if you didn't
delete it this is good because now we
have our X location automatically being
put inside of this location file and
with anywhere we click he's going to
move to that X location and also I can
click up here and he's still going to
stay in that same spot now we can go
back to here and one thing you'll notice
is I can click but I can't move the
image around which is bad so we need to
go down here and we want to say begin
I'm sorry touches touches moved and we
want to basically just copy and paste
this exact piece of code inside of our
touches moved so we can build and run
this
and as you will see we have our player
and you can touch and move him around
and now we want to actually spawn some
bullets from our players guns per se so
we can save function so f UNC and we're
going to type in spawn our our bullet so
spawn bullets and then open parentheses
close parentheses open pro curly mark
close curly bracket and inside of these
spawn bullets we want to create a bullet
object so we need to do basically what
exactly what we did right up here where
we said var player equals SK and up
sprite node we need to save our our
bullet so we're going to call this a
bullet equals an SK sprite node and this
is going to be an image named and this
will be equal to the image named our
bullet Galaga dot PNG so bullet Galaga
dot PNG and also make sure that it's
capitalized the same way and because
it's not going to work now down here we
want to say bullet dot Z position if you
don't know anything about 3d programming
basically it's just putting it behind an
object or in front of an object
depending on its Z position so this
player sprite node is automatically
built at a Z position of 0 now if we
move this behind 0 we can automatically
make the bullet seem like it's coming
from behind the enemy from our player
ship so you can say bullet dot Z
position equals negative 5 and this is
going to give it the illusion that it's
right behind it was built inside of our
ship now inside of this spawned bullets
we also want to say bullet dot position
will be equal to our CG point make and
our point make we're going to make this
point it the same as our player dot
position X and our player dot position
dot Y and now that we have those done we
can build and run actually we can't
build and run this chest yet because if
you were to build and run nothing would
happen so down here we want to say self
dot add child
and this will be our the same as our our
bullet that we created run up here so
we're adding this child on to our scene
now up here in our did move to view we
also want to create a timer so this
timer will just say that we're going to
save our timer is equal to NS timer dot
scheduled timer with time interval and
this time interval will be equal to zero
point we'll say 2 and our invocation
will be actually we we don't want this
one we want to say scheduled timer with
interval open curly braket like an
interval open curly bracket and we want
this one that's a TI target selector we
don't want the bundle above that so in
this one our time interval will be zero
point two our target will be self
meaning that we're going to be affecting
the scene itself and then our selector
we're going to say selector and
basically what the selector is meaning
is what is it going to call every point
two seconds what function is it going to
call every point two seconds now you
might think that this is good idea to
just take this spawn bullets and put it
right inside of our selector it looks
like it's working fine but it never does
I don't understand why it doesn't give
any errors but in here you will have the
user info we'll put this as nil and our
repeats as true now if you were to build
and run this right now you wouldn't get
any errors but you would be there are
some problems actually would get errors
I was wrong now let's go back to our
game scene dot Swift and hit on two over
to our spawn bullets it's not telling us
that we have an earth that's what I made
them at it's not telling us that we have
an error but there is an error so we
need to go down here to our selector and
just erase the parentheses that's around
our spawn bullets and say open group
open quotation mark close quotation mark
before the spawn bullet so it just
highlights it in red and now if we were
to build and run this we will have a
scheduled timer at running every point
two seconds building and running our
bullets at the point of our player dot
position now we actually need to make
this bullet fly forward so it's actually
going to be able to hit some of the
objects and
just laying down where it normally was
so in sort of in order to do this inside
of our spawn bullets we want to create
an action so it's a let action equal SK
action dot move to Y so we're going to
move to a y-value or a different Y
position for our bullet and the Y
position that we want it to go to is
self dot position
I'm sorry self dot size dot height in
our duration we'll just make this very
quick so we're going to make it go at a
speed of zero point zero point six
sounds good and then down here out
there's actually an error around with
this but I'll show you exactly how to
fix that in just a minute but press
ENTER and below the action we want to
add this action actually to our bullet
so it moved to this Y value with their
duration of 0.6 so in order to do this
you just say enemy I mean sorry bullet
getting mixed up your bullet dot run
action and this will be SK action dot to
repeat action forever and the action is
the action that we just created so we're
going to repeat this action that we just
created like so so now if we want to
build and run this we will have a our
bullets flying up and now as you can see
if you look at our nodes right down here
we are getting this just piling up with
the amount of nodes that we have and we
don't want this to happen either so in
order to do this there's a couple ways
you can do this
my favorite way is actually just getting
it to go off the scene so in order to do
this you just set the duration we'll set
it to a 1.0 so it's one second and then
we're going to add 30 pixels to on to
our scene like so and now this is
actually because it's going out of the
scene that's very nice about game scene
dot Swift about this sprite kit as soon
as it goes out of the scene it actually
destroys the node itself so now we
actually have a our bullets flying and
we can move our player all around so
yeah and now let's create our enemies
so in order to create some enemies we
need to create a new function I'm going
to end this process real quick so we
need to say function spawn enemies open
parentheses close parentheses open
quotation open curly braket close curly
bracket and inside of spawn enemies we
just save our enemy equals SK sprite
node and this is going to be image named
again and we're going to just fill in
our image in this is going to be enemy
Galaga as we have done before in the
past dot PNG so the trick with our enemy
is we want to take our enemy and we want
to spawn it at different X values along
this top y axis so in order to do this
you just need to go down here and say
our minimum this is going to be our
minimum value so actually we need to
save our minimum value is equals self is
equal to self dot size dot width so
we're taking the screen size and then
we're going to divide this by eight or
divided by eight like so and then our
maximum value we just need to save our
max value will be equal to self dot size
dot width and then we're going to
subtract 20 from that width so it
actually doesn't go off the scene this
will be helpful for later on and then
down here we need to take our var and
this will be basically the difference or
our main spawning point or our spawn
point will be equal to our maximum value
so we're taking the difference and we
just say maximum value minus the minimum
value and we're also going to convert
this to a UI int so UI int 32 like so
the main purpose of the UI in 32 is that
there are 32 bits that are going to be
stored in this and that's going to allow
for more precision in the placement of
things so when you just need to say
enemy dots position equals CG point and
then open
open bracket or open parentheses and
this will be X Y our x value will be
equal to our spawn point randomly chosen
so in order to do this you just say CG
float so CG float open parenthesis and
this is going to be random or arc sorry
arc for random underscore uniform this
is going to be our UI and 32 that we
just created right up here so and so
just type in spawn point like so and
then our Y value will be equal to our
self dot size dot height so now if we
were to we can't build and run this
chest yet because we need to add this
enemy T onto our scene in order to do
this you just say self dot add child and
this is going to be our enemy that we
just created so we're adding this child
onto our scene so now we want to go into
our did move to view and spawn our enemy
that we just created so in order to do
this we basically do exactly what we did
with the bullets by just saying var this
will be our enemy timer is equal to r NS
timer dot scheduled timer i spelt timer
wrong that's why it's not coming up dot
scheduled timer with time interval and
make sure it's the tire target selector
user info and repeats our time interval
i'm just going to make this every one
second our target will be equal to self
so we're going to send our timer over to
our game scene dot swift and then our
selector will be our again our selector
just type that in open parentheses close
parentheses open quotation my close
quotation mark take the name of this
copy and paste that in and this will be
our spawn enemies so now we're going to
spawn our function or at call this
function every one second userinfo nil
we don't want anything and the repeat
equals true so now if we were to build
and run this we would have our enemy
spawning at
in places along the top as you can see
they're not moving this is the exact
problem that we did with our bullets so
we need to go down here to our spawn
enemies and we need to create some
actions so we say let action equal and
our action will be equal to an SK action
dot move to Y and our Y value will be
equal to negative 30 as we want to just
go we want it to just go right out of
the scene and our duration will be
pretty slow we're going to make it three
seconds and now we're going to add the
action this action onto our enemy so we
just say enemy dot run action and this
is going to be SK action dot repeat
action forever and we're going to repeat
this action that we created like so and
now we're going to build and run and now
we should see our enemy just coming down
on us so now as you can see we have our
enemies and they're coming down on us
now of course the bullets aren't working
that will be done in part two of this
video tutorial series but as you will
see we have our player coming down
they're coming at a quite slow rate and
they would that is perfect now I am
seeing that this is spot piling up down
here so we're getting more and more
nodes every second we don't want that
because that reduces frame right so go
down here and we want to just increase
this move to Y just to 70 we'll just say
so we can build and run this again and
as you will see we have our player
moving down the scene like so and easy
racing every time if you watch the nodes
and now if you want to change the
duration at which our enemies come down
you can just or how fast the enemies
come down you can go to this action and
we can change the duration to just a two
seconds and that'll make it come down a
bit faster like so so that's going to
make it come down a bit faster and make
it a bit harder and if you want you can
also go up here to your spawn bullets
and also if you want to spawn more
enemies you can always come up here to
your enemy timer and we can change this
to up to a 0.5
and we'll we can spawn our bullets a bit
faster as well by just changing those
time intervals so we can build and run
those I like so and now we had those
bullets all running and now if you want
to speed up the bullets you can also
just set the duration of our action
right here to a zero so in 0.5 seconds
we want our bullets to hit up there hit
the top of the scene we can do so there
you have it that is very fast but you
might like that you might have a
fast-paced type of game anyway that is
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
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next one
hey everybody
About this Video
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Apr 19, 2026 Last updated
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