函数仅适用于第一个生成的精灵，而不适用于另一个

Posted 2023-03-08

【中文标题】函数仅适用于第一个生成的精灵，而不适用于另一个

【英文标题】：Function only works on the first spawned sprite and not the other

【发布时间】：2016-04-04 22:57:30

【问题描述】：

我是编程新手，但仍在学习很多东西。我刚刚遇到了一个问题。我遇到问题的部分是 SharkWall() 函数，它使“SHARKNODE”-sprite 以各种方式到达屏幕末端时转身并朝相反的方向前进。 “鲨鱼节点”每 0.75 秒产生一次，在 Y 方向上有一个计时器。这就是问题所在。 SharkWall() 函数似乎只在第一个生成的“SHARKNODE”-sprite 上工作，而不是在 Y 轴上更高处生成的其他精灵上工作。值得一提的是，第一个生成的精灵是唯一在屏幕上可见的精灵，直到玩家在 Y 轴上的位置更高，并且其他“SHARKNODE”精灵出现在屏幕上。当然，我想要的是让 SharkWall() 函数适用于所有“SHARKNODE”精灵。 任何对在这里做什么有想法并可以解释的人？提前致谢。

GameScene.swift：

class GameScene: SKScene, SKPhysicsContactDelegate 


var background:SKNode!
var midground:SKNode!
var foreground:SKNode!

var buttonPressed = 0

 var leftButtonFirst: UIButton!
 var rightButtonFirst: UIButton!

var hud: SKNode!
var scaleX = 0
var sharkSprite = SKSpriteNode()

var counter = 1
var player: SKNode!

var scaleFactor:CGFloat!

var startButton = SKSpriteNode(imageNamed: "TapToStart")

var endOfGamePosition = 0

let montionManager = CMMotionManager()

var xAcceleration:CGFloat = 1

var scoreLabel: SKLabelNode!
var flowerLabel: SKLabelNode!

var playersMaxY:Int!

var GameOver = false

required init?(coder aDecoder: NSCoder) 
    super.init(coder: aDecoder)

    

override init(size: CGSize)
    super.init(size: size)

    backgroundColor =  UIColor(red: (57/255.0), green: (214/255.0), blue: (255/255.0), alpha: 1.0)

    scaleFactor = self.size.width / 200


    background = createBackground()
    addChild(background)

    midground = createMidground()
    addChild(midground)

    foreground = SKNode()
    addChild(foreground)

    player = createPlayer()
    foreground.addChild(player)



    var bubbleTimer = NSTimer.scheduledTimerWithTimeInterval(0.75, target: self, selector: #selector(GameScene.bubbleMaker), userInfo: nil, repeats: true)

    var sharkTimer = NSTimer.scheduledTimerWithTimeInterval(0.75, target: self, selector: #selector(GameScene.sharkMaker), userInfo: nil, repeats: true)


    physicsWorld.gravity = CGVector(dx: 0, dy: -3)
    physicsWorld.contactDelegate = self

   



func bubbleMaker() 
    let randomXPos = arc4random_uniform(172) + 15
    let yPosition = CGRectGetMidY(self.frame) + 200 * CGFloat(counter)
    counter += 1
    let platformNode = createPlatformAtPosition(CGPoint(x: CGFloat(randomXPos), y: yPosition - 180), ofType: PlatformType.normalBubble)
    foreground.addChild(platformNode)





func sharkMaker() 
let randomXPos = arc4random_uniform(170) + 10
let yPosition = CGRectGetMidY(self.frame) + 200 * CGFloat(counter)
counter += 1
let shark = createSharkAtPosition(CGPoint(x: CGFloat(randomXPos), y: yPosition - 180), ofType: SharkType.normalShark)
foreground.addChild(shark)




override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) 

    if player.physicsBody!.dynamic 
        return
    

    player.physicsBody?.dynamic = true
    player.physicsBody?.velocity.dy = CGFloat(500)
    createLeftButton()
    createRightButton()

    createLeftButtonFirst()
    createRightButtonFirst()



override func didSimulatePhysics() 

    if player.position.x < -10 
        player.physicsBody?.applyImpulse(CGVectorMake(3, 0))
    else if (player.position.x > self.size.width + 10) 
          player.physicsBody?.applyImpulse(CGVectorMake(-3, 0))
    
    sharkWall()



func didBeginContact(contact: SKPhysicsContact) 
    var otherNode:SKNode!

    if contact.bodyA.node != player 
        otherNode = contact.bodyA.node
     else 
        otherNode = contact.bodyB.node
    

    (otherNode as! GenericNode).collisionWithPlayer(player)



override func update(currentTime: CFTimeInterval) 





    foreground.enumerateChildNodesWithName("PLATFORMNODE") (node, stop) -> Void in
        let platform = node as! PlatformNode
        platform.shoudRemoveNode(self.player.position.y)
    

    if player.position.y > 200 
        background.position = CGPoint(x: 0, y: -((player.position.y - 200)/10))
        midground.position = CGPoint(x: 0, y: -((player.position.y - 200)/4))
        foreground.position = CGPoint(x: 0, y: -((player.position.y) - 200))
    



func sharkWall()
if foreground.childNodeWithName("SHARKNODE")?.position.x < -10 
        foreground.childNodeWithName("SHARKNODE")?.xScale =  -1
        foreground.childNodeWithName("SHARKNODE")?.physicsBody?.velocity.dx = CGFloat(50)
    else if (foreground.childNodeWithName("SHARKNODE")?.position.x > self.size.width + 10) 
            foreground.childNodeWithName("SHARKNODE")?.xScale = 1
            foreground.childNodeWithName("SHARKNODE")?.physicsBody?.velocity.dx = CGFloat(-50)
    




func createLeftButton () 
    let button = UIButton();
    button.frame = CGRectMake(self.frame.width - self.frame.width, 0, self.frame.width / 2, self.frame.height) // X, Y, width, height

    button.addTarget(self, action: #selector(GameScene.buttonPressedRight(_:)), forControlEvents: .TouchUpInside)
    self.view!.addSubview(button)
    button.layer.zPosition = -1



func createRightButton () 

    let buttonRight = UIButton();

    buttonRight.frame = CGRectMake(self.frame.width / 2, 0, self.frame.width / 2, self.frame.height) // X, Y, width, height

    buttonRight.addTarget(self, action: #selector(GameScene.buttonPressedLeft(_:)), forControlEvents: .TouchUpInside)
    self.view!.addSubview(buttonRight)
    buttonRight.layer.zPosition = -1


func createLeftButtonFirst () 
    leftButtonFirst = UIButton()
    leftButtonFirst.frame = CGRectMake(self.frame.width - self.frame.width, 0, self.frame.width / 2, self.frame.height) // X, Y, width, height

    leftButtonFirst.addTarget(self, action: #selector(GameScene.buttonPressedLeftFirst(_:)), forControlEvents: .TouchUpInside)
    self.view!.addSubview(leftButtonFirst)
    leftButtonFirst.layer.zPosition = 1


func createRightButtonFirst () 

    rightButtonFirst = UIButton()
    rightButtonFirst.frame = CGRectMake(self.frame.width / 2, 0, self.frame.width / 2, self.frame.height) // X, Y, width, height
    rightButtonFirst.addTarget(self, action: #selector(GameScene.buttonPressedRightFirst(_:)), forControlEvents: UIControlEvents.TouchUpInside)
    self.view!.addSubview(rightButtonFirst)
    rightButtonFirst.userInteractionEnabled = true
    rightButtonFirst.layer.zPosition = 1




func buttonPressedRight(sender: UIButton!) 

    if player.physicsBody?.velocity.dx > 0 
       player.physicsBody?.velocity = CGVector(dx: -200, dy:  player.physicsBody!.velocity.dy)
 

    player.xScale = -1

func buttonPressedLeft(sender: UIButton!) 
    if player.physicsBody?.velocity.dx < 0 
        player.physicsBody?.velocity = CGVector(dx: 200, dy:  player.physicsBody!.velocity.dy)
    
    player.xScale = 1


func buttonPressedLeftFirst(sender: UIButton!) 
    player.physicsBody?.velocity = CGVector(dx: -200, dy:  player.physicsBody!.velocity.dy)

    player.xScale = -1

    rightButtonFirst.hidden = true
    leftButtonFirst.hidden = true


func buttonPressedRightFirst(sender: UIButton!) 
    player.physicsBody?.velocity = CGVector(dx: 200, dy:  player.physicsBody!.velocity.dy)
    player.xScale = 1

    rightButtonFirst.hidden = true
    leftButtonFirst.hidden = true

GameElements.swift：

 import SpriteKit

 extension GameScene 


func createBackground() -> SKNode
    let backgroundNode = SKNode()
    let spacing = 32 * scaleFactor

    for index in 0 ... 20 

        let node = SKSpriteNode(imageNamed: String(format: "Background/Background%02d", index + 1))
        node.setScale(scaleFactor)
        node.anchorPoint = CGPoint(x: 0.5, y: 0)
        node.position = CGPoint(x: self.size.width / 2, y:spacing * CGFloat(index))
        node.size.width = self.frame.width

        backgroundNode.addChild(node)
    

    return backgroundNode



func createMidground () -> SKNode

let midgroundNode = SKNode()
var anchor: CGPoint!
var xPos: CGFloat!

for index in 0 ... 250 
    var name: String

    let randomNumber = arc4random() % 2

    if randomNumber > 0 
        name = "whale"
        anchor = CGPoint(x: 0, y: 0.5)
        xPos = CGFloat(arc4random_uniform(170) + 15)
     else
        name = "whale"
        anchor = CGPoint(x: 1, y: 0.5)
        xPos = CGFloat(arc4random_uniform(170) + 15)
    
    let cloudNode = SKSpriteNode(imageNamed: name)
    cloudNode.alpha = 0.3
    cloudNode.anchorPoint = anchor
    cloudNode.position = CGPoint(x: xPos, y: 500 + 500 * CGFloat(index))
    midgroundNode.addChild(cloudNode)


    return midgroundNode



func createPlayer() -> SKNode 

let playerNode = SKNode()
    playerNode.position = CGPoint(x: self.size.width / 2, y: 80)

    let sprite = SKSpriteNode(imageNamed: "Player")
    playerNode.addChild(sprite)

    playerNode.physicsBody = SKPhysicsBody(circleOfRadius: sprite.size.width / 2)

    playerNode.physicsBody?.dynamic = false
    playerNode.physicsBody?.allowsRotation = false

    playerNode.physicsBody?.restitution = 1
    playerNode.physicsBody?.friction = 0
    playerNode.physicsBody?.angularDamping = 0
    playerNode.physicsBody?.linearDamping = 0

    playerNode.physicsBody?.usesPreciseCollisionDetection = true

    playerNode.physicsBody?.categoryBitMask = CollisionBitMask.Player

    playerNode.physicsBody?.collisionBitMask = 0
    playerNode.physicsBody?.contactTestBitMask = CollisionBitMask.Bubble | CollisionBitMask.Shark

    return playerNode





func createSharkAtPosition (position:CGPoint, ofType type:SharkType) -> SharkNode 

    let shark = SharkNode()
    let position = CGPoint(x: position.x * scaleFactor, y: position.y)
    shark.position = position
    shark.name = "SHARKNODE"
    shark.sharkType = type

    let spriteTexture1 = SKTexture(imageNamed: "shark1")
    let spriteTexture2 = SKTexture(imageNamed: "shark2")
    let spriteTexture3 = SKTexture(imageNamed: "shark3")

    let sharkAnimation = SKAction.animateWithTextures([spriteTexture1, spriteTexture2, spriteTexture3], timePerFrame: 0.2)
    let makeSharkFlap = SKAction.repeatActionForever(sharkAnimation)

    sharkSprite = SKSpriteNode(texture: spriteTexture1)
    sharkSprite.runAction(makeSharkFlap)
    shark.addChild(sharkSprite)


    shark.physicsBody = SKPhysicsBody(rectangleOfSize: sharkSprite.size)
    shark.physicsBody?.dynamic = true
    shark.physicsBody?.affectedByGravity = false
    shark.physicsBody?.categoryBitMask = CollisionBitMask.Shark
    shark.physicsBody?.collisionBitMask = 0
    shark.physicsBody?.velocity = CGVectorMake(-60, 0)

    return shark




func createPlatformAtPosition (position:CGPoint, ofType type:PlatformType) -> PlatformNode 

    let node = PlatformNode()
    let position = CGPoint(x: position.x * scaleFactor, y: position.y)
    node.position = position
    node.name = "PLATFORMNODE"
    node.platformType = type
    var sprite:SKSpriteNode

    sprite = SKSpriteNode(imageNamed: "bubble")

    node.addChild(sprite)

    node.physicsBody = SKPhysicsBody(circleOfRadius: sprite.size.height / 2)
    node.physicsBody?.dynamic = false
    node.physicsBody?.categoryBitMask = CollisionBitMask.Bubble
    node.physicsBody?.collisionBitMask = 0

    return node

【问题讨论】：

有人知道如何解决这个问题吗？

【参考方案1】：

childNodeWithName只调用第一个有名字的子节点，需要全部枚举出来

func sharkWall()
    foreground.enumerateChildNodesWithName("SHARKNODE")
        node, stop in 
        if node.position.x < -10 
            node.xScale =  -1
            node.physicsBody?.velocity.dx = CGFloat(50)
        else if (node.position.x > self.size.width + 10) 
            node.xScale = 1
            node.physicsBody?.velocity.dx = CGFloat(-50)