making a platformer game in xcode - part 2 movement

Hello and welcome back to part 2.

And this time we're going to make a left

and right button to make our character

move left and right. Now this is a bit

complicated because we need 2 actions for

one button. So when you press the button,

the character starts moving, and when you

let go of the button, the character stops

moving. So let's get some buttons down,

just copy and paste jump and then rename

them. And you have to cancel off

these because when you copy and paste the

button, it also copies the, the actions.

So let's call this left and then call

this right, and we'll put it down here.

So we need 2 IBOutlets

for the buttons, left and

right. And we also need

2 timers for— oops.

Need 2 timers for left and right. Maybe we

should change this to left timer and

right timer.

We also need a void— 2 voids,

or was it 4 voids? Go left and

go right. And we

need— I think it's 4 actions.

I'm gonna have to check later.

Start left.

And we also want StopLeft.

So this is what happens when you, when you

stop, when you let go of the button.

And then the same for StartRight and

StopRight. Okay, so do

IBAction and get rid

of sender. And we do startLeft.

Now when you press startLeft, you want to

start the timer. So leftTimer equals

NSTimer.scheduleTimeInterval,

and do this one: 0.05,

target self at selector And

in here we have to put— what did we name

it? Yeah, it's goLeft, and then do

userInfo nil, repeats yes.

And then we need

a void for goLeft.

Now when you press on goLeft, you want

the character to be moving to the left.

So CGPoint.make .

And let's link them up. It probably won't

work right now because it's kind of

unfinished.

So left goes to left,

right goes to right, start left

goes to left. Now for start left, we want

touchdown. So touchdown is holding

the button down. Start right is also

touchdown, and stop left is going to be

touch up inside. So that when you let go

of the button, that code runs.

Same for right touch up inside. So let's

just see what happens.

Where is it?

It's taking its time to open.

Okay, there we go. So what does left

do? It crashes. Okay, that's because we

haven't done the stop left code yet,

so we need to do IBAction Stop

left.

Now what's going to happen is we

invalidate the timer, so leftTimer

invalidate. Okay, see what happens now.

Yep, that's it. That's strange because in

my other game there was more code, more

code to it, but I guess that's all you

need. So you hold left and he goes left,

let go of left and he stops moving. So

let's just repeat that for the right-hand

side. So just copy, copy and paste all

this and then just change left to

right. Go right. And change

this to plus. And start right,

right timer, go right,

stop right, right timer.

And that's it, should be done.

So we got right And we got left, and we

also have a jump. So yeah,

that's that's it. We're done. It was

easier than I expected actually. How about

you? Did you find it easy? It's pretty

easy, right? Oh crap! We've bugged it.

Okay, so maybe there's some problems.

Okay, I think I found the problem.

Oh, I had this problem before. If you hold

the button and drag off the button, it

just keeps moving like this. Now, how did

I fix this last time?

I think I changed touch up inside to

something else. Was it touch up?

Touch— was it touch cancel?

So I had the same problem before and I

fixed it, but I can't remember how I did

it. Okay, I just found out what happened.

Okay, so we actually need stop right 2

times on each button, not just once. So

we've got stop left, touch up inside. We

also need second one, touch up outside.

So the code doesn't only cancel when

you've stopped pressing the button, but

also when you've dragged off the button

and let go. So let's just see what

So we drag off and it should stop.

That's good. Okay, so we didn't do that

for the right button. So as you can see,

if you press the right button and then

drag off and and then let go, he keeps

going on. So to fix that, just get your

stop right again, drag it back onto right,

and also do touch up outside. So if you

let go of the button on the button and

outside of the button, it's going to run

the stop right code, if that makes any

sense. So there we go,

we're moving left and right, and we're

also jumping. Next time we're gonna add

like an obstacle we can jump over.

And yeah, I'll see you, see you next time.

Bye-bye.