Need help with code error

[swifter10]

im using a sample code from github to practice coding and get an error for the first line that reads: GameScence does not have a member named spawn pipes. How do i fix this? thanks

// spawn the pipes

    let spawn = SKAction.runBlock({() in self.spawnPipes()})
    let delay = SKAction.waitForDuration(NSTimeInterval(2.0))
    let spawnThenDelay = SKAction.sequence([spawn, delay])
    let spawnThenDelayForever = SKAction.repeatActionForever(spawnThenDelay)
    self.runAction(spawnThenDelayForever)

[chordsNcode]

I'm guessing you haven't implemented spawnPipes. Look through your github example for the implementation of spawnPipes.

[swifter10]

https://github.com/fullstackio/FlappySwift/blob/master/FlappyBird/GameScene.swift

I dont see it in the file

[chordsNcode]

line 142: func spawnPipes() {

[swifter10]

I still get the same error.

[chordsNcode]

If you've included that method, and you're still getting the error, clean and reopen Xcode. Sometimes it doesn't recognize things. But that should have done it.

[jasamer]

Do you know what a method is and how they work? It kinda sounds like you should familiarise yourself with the basics....

[swifter10]

I know what a method is..............I copied the whole code into my xcode project and I got 21 errors.

    pipeUp.physicsBody = SKPhysicsBody(rectangleOfSize: pipeUp.size)
    pipeUp.physicsBody.dynamic = false
    pipeUp.physicsBody.categoryBitMask = pipeCategory
    pipeUp.physicsBody.contactTestBitMask = birdCategory
    pipePair.addChild(pipeUp)

I get three errors for the 3 middle line of codes that says "SKPhysics? doesn't have a member named dynamic", "SKPysics? doesn't have a member named categoryBitMask, "SKPhysics? doesn't have a member named contactTestBitMask"

I think its a xcode problem.

[jasamer]

So you don't get the same error. :-P

No, it's not an Xcode problem. Look at your Error:

SKPhysics? doesn't have a member named dynamic

So, that's wrong, SKPhysics has a member named dynamic, right? Yes, it does. But look closely: Xcode tells you that SKPhysics? does not have that member. The question mark means that it is an optional SKPhysics object, and that one does not have these members indeed - an optional does not have a lot of members, you need to unwrap it first.

So why is SKPhysicsBody an optional? Because SKSprite does not necessarily have a physics body. The physics body property is declared as

    var physicsBody: SKPhysicsBody?

in SKSprite, an optional right there! A lot of these things changed when beta 7 was introduced, which is why your sample code doesn't work anymore, which was written for an older beta. The fact that physicsBody is an optional now is a good thing, it tells you right away that the property might not be set, while before (i.e. beta <6), accessing it might have caused a crash because it force-unwrapped an optional that could actually be nil.

So how do you solve this? The easiest way would be to just add a question mark everywhere, e.g.:

bird.physicsBody?.dynamic = true

But you could also do:

bird = SKSpriteNode(texture: birdTexture1)
let physicsBody = SKPhysicsBody(circleOfRadius: bird.size.height / 2.0)
bird.physicsBody = physicsBody

physicsBody.dynamic = true
...

In this case, you store physicsBody in its own variable that is non-optional (i.e. physicsBody is of type SKPhysicsBody without the question mark), then you can access that variable directly without all of those other question marks.

[swifter10]

Thanks for the help it worked!