How to make a HIGH SCORE in Unity Video Lecture | Build a Game: Unity Tutorial (English) - Game Development

hello everyone and welcome to this video
on creating a high score for your game
in this video we are going to explore
some simple techniques for storing data
on your system to do that we'll be using
unity building player prefs
something that's pretty easy to use but
can come in really really handy all
right let's get started
so as you can see I've set up this test
scene with a few UI pieces first up we
have the road dice button whenever you
press this we want the number to change
to a random number between 1 and 6 we
also have the high score which is going
to display the largest number that we
have so far so whenever our score is
greater than the high score we'll set
our high score equal to that number and
then finally we have a button for
resetting our high score so let's make
these things actually do something let's
begin by creating an empty object let's
reset the transform and call this one
dice we also add a component to this and
call that dice as well I'm going to
choose c-sharp and they create an ADD
let's double click it to open it up in
Visual Studio let's remove the two using
tags up here and both the methods so the
first thing we need to do is change our
score text to do that we need a
reference to the text object and it's
using this unity GUI system so remember
whenever we code for the unity GUI we
need to go up here and say using unity
engine UI we're now able to make a
variable of type text and we'll call it
our score of course you need to make
sure that this is marked as public and
this way when we save it and go back
into unity we can take this score object
and simply drag it in now in order to
update this we need to make a method
let's go void let's call it something
like update score or roll dice we can
then get a random number we do that by
going random range and the number we
want to get is between 1 and this is
inclusive and then 7 and this is
exclusive this way we can get the
numbers 1 2 3 4 5 & 6 but not the number
7 we can then store this in a temporary
variable so let's write integer and
let's give this variable a name say
let's just call it number so we're now
creating an integer variable code number
and giving it a random number between 1
and 6 we can then set score text equal
to that number however there is one
slight problem with this and that is
that our number is currently an integer
whereas our text is a string so we need
to convert from one data type to another
luckily converting to strings is really
see all we need to do is write dot to
string and then to parentheses and this
function will go ahead and convert the
number into a string so everything adds
up we now save this heading to unity and
of course nothing is going to happen so
far because we are not actually calling
the function we've made the function but
we need to also trigger it to do that we
use a button event let's find our roll
dice button and this is just an ordinary
button we go ahead and add an on-click
event by hitting the plus we drag in the
dice where script is sitting then if we
go here and select a function we can go
under the die script and select one but
you can see that our function is not
currently visible that's because we also
need to mark the function as public
let's go into visual studio and insert
public again save that and when we now
go into unity we can see that under dice
there's now a function called Road dice
alright so when we hit play we are now
able to roll the dice and get a random
number and displayed on this screen but
how do we store this as a high score to
do that we use what is called player
press player perhaps it's a data
civilization tool built into unity that
means that it's a way for unity to store
pieces of data somewhere on our system
that means the during our game we can
set certain values and then load them
back in at a later time and so we can
have data persist from one game play
session to another as long as it's on
the same computer taking advantage of
player press it's actually really easy
to set a number we go player press dot
set integer note that you can also set
floats or strings but we'll set integer
and this is a function that takes in two
values the first one is a key this is
simply a string that makes the name of
the variable so in our case we could
call it something like high score we
then write comma and feed it the value
in our case the value is going to be
number whatever number we rolled if we
then want it at a later point to get
this value we use player proofs get an
example of this could be at the
beginning of our game we could do this
in the start method which is called
whenever we start the game we could
display our high score so of course we
need a reference to a high score text
object so let's create another public
text and call this one high score and
then in the start method we'll set high
score dot text equal to and then we use
player press dot get int and as the key
we need to write the exact same as we
did down here or else it's
going to work so I'm just going to copy
it and that's all we need to do only of
course this is again returning an
integer and high score text is requiring
a string so we need to again follow this
up with dot to string so what we should
see now is that whenever we roll the
dice we're going to display a random
number and store that number on the
computer as high score then the next
time we start the game we're going to
set a high score text equal to that high
score number but of course the first
time we start our game that isn't going
to be a high score stored and so we need
to give this some kind of default value
and that's really easy all we do inside
of a get in method is write a comma and
then the default value we want and we're
just going to set that to zero let's
save this and see if it works of course
make sure to select the dice and drag in
the high score text to swap so we can
play we can see that at first our high
score sets itself to zero
we then roll the dice and our high score
is not going to update yet
but if we then exit play mode and play
again it's going to remember that value
but there are a few problems with this
first off we want the high score to
update as soon as we roll the dice but
we also only wanted to update if we get
a value that's larger right now if we
roll the dice and get say the value 2
that's what it's going to remember so if
we go back here and hit play it should
now display 2 and of course we never
want a high score to decrease to fix
this again we go into visual studio we
go down here to where it sets our high
score and we simply check if the number
we rolled is bigger than our current
high score to do that rewrite if then
number and we want to check if that's
greater than and then we get a high
score so we'd write player press and the
key is high school and then again a
default value of zero and that's it so
if this if statement is true it means
that we've beaten our high score and so
we can go ahead and set it to the new
number we could also add some kind of
effect here congratulating the player on
beating the score finally we probably
also want to update the high score right
away and not wait until we reboot the
game to do that we just set high score
equal to the number we wrote again we
only want to do this if we roll the
greater number and again remember to put
two strings here so if we now save and
hit back into unity our high score
system should actually be complete so
currently our high score is two if we
roll the dice and get a six you can see
it updating but if you roll the dice
again and get a one it stays at six and
if we exit the game and play it again we
can see that our high score still
remembers the six but what if we want to
reset our high score this is really
really handy when debugging but
sometimes you also want players to be
able to reset their settings and start
over doing that is really really simple
all we need to do is go in and add
another function we'll also make this a
public voice so we can trigger it using
the button and we'll call it something
like reset we can then open and close
some curly brackets and in here we'll
write player press Delete and here we
have the possibility of deleting a
specific key in our case we would go in
and say delete key and then high score
and this would work just fine
or we can delete all of the save
settings of course use this with caution
if you're also storing other stuff like
player usernames progress data or
anything else it will be deleted but I
like living on the edge so I'm just
going to write the lead all let's save
this and in unity we now need to add
this to the onclick event so let's go
into the reset button let's add an on
click event
let's drag in our dice and this time as
the function we are not going to select
row dice what we set and so when we hit
play we can still roll the dice and
everything but as soon as we hit reset
it's going to reset our high score of
course we can't see this because we are
updating the text object but if we go
out of play mode and go back in we can
see that it sets itself back to zero and
so all we need to do is just add high
score text equals and then we'll write a
zero here of course the quotation marks
are still there because we want it to be
a string now we can actually visually
see that it resets that said play roll
the dice
reset the high score roll it again and
you can see that now working
let's pretty much it for this video if
you enjoyed it make sure to subscribe so
you don't miss a future episode also
remember that you can easily expand upon
the system to turn it into a
full-featured scoreboard thanks for
watching and I will see you in the next
video
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