Swift 和生成对象的计分方法
Scoring Method for Swift & Spawning objects
我似乎无法弄清楚如何让我的评分发挥作用...
游戏的概念是小鸟会从右手边进来，当它们到达左手边时，我希望我的分数增加 1。
在Obj_c我会做类似
的事情
if (bird.enter.x < 0) {
score++
}
但是在 swift sprite kit 中，我不确定该怎么做...
我遇到的另一个问题是我必须使用计时器让我的 "Enemy Birds" 产卵（鸟从右到左）
（计时器每 1 秒运行一次生成敌人函数）但在 Obj_c 中我会在不同的 x 坐标处生成 3/4，就像之前的代码一样，当鸟小于 0 像素时我会 CGPointMake() 回到屏幕的另一边，这样他们就在一个恒定的循环中
有没有在 swift 中执行此操作的想法？我的代码如下：它的布局有点奇怪：
import SpriteKit
class GameScene: SKScene, SKPhysicsContactDelegate {
var bg = SKSpriteNode() // Create Background
var bird = SKSpriteNode() // Create User Bird
var scoreLabel = SKLabelNode() // Create Score Label
var score: Int = 0 // Create Score Integer
var enemyBird = SKSpriteNode() // Create Enemy Bird
var birdGroup:UInt32 = 1 // Bird Collision Group
var objectGroup:UInt32 = 2 // Enemy Collision Group
var scoreGroup:UInt32 = 3 // Score Collision Group
var gameOver = 0 // Game Over function
var movingObjects = SKNode() // ??
var gameOverLabel = SKLabelNode() // Game over label
var labelHolder = SKSpriteNode() // Holds Label - Game Over
var Menu = 0
/* Put Bird in and animate */
var birdTexture = SKTexture(imageNamed: "bird_img_1.png")
var birdTexture2 = SKTexture(imageNamed: "bird_img_2.png")
var birdTexture3 = SKTexture(imageNamed: "bird_img_3.png")
var birdTexture4 = SKTexture(imageNamed: "bird_img_4.png")
var birdDeadTexture = SKTexture(imageNamed: "bird_img_dead.png")
var finalSpawn: CGFloat = 0.0
/* ------------------------------------ Main Setup ------------------------------------------ */
override func didMoveToView(view: SKView) {
/* Setup your scene here */
println("Moved to Game Scene")
movingObjects.speed = 0
/* Call Functions */
backgroundImage()
enemySpawn()
/* Set up deletates and physics and timer */
self.physicsWorld.contactDelegate = self
self.physicsWorld.gravity = CGVectorMake(0, -5)
self.addChild(movingObjects)
self.addChild(labelHolder)
/* Load Score Text */
scoreLabel.fontName = "Helvetica"
scoreLabel.fontSize = 60
scoreLabel.text = "0"
scoreLabel.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame)+self.frame.size.height*0.3)
self.addChild(scoreLabel)
enemyBird.position = CGPointMake(self.frame.width+200, 500)
movingObjects.addChild(enemyBird)
bird = SKSpriteNode(texture: birdTexture)
bird.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame))
// Make bird smaller
bird.size.height = bird.size.height/12
bird.size.width = bird.size.width/11
// Animate Bird
var animation = SKAction.animateWithTextures([birdTexture, birdTexture2, birdTexture3, birdTexture4], timePerFrame: 0.08)
var makeBirdFlap = SKAction.repeatActionForever(animation)
bird.runAction(makeBirdFlap)
// Load Physics
// birdPhysics()
// Run bird animation
bird.zPosition = 10
self.addChild(bird)
/* Introduce ground and top into the scene */
// Create Ground
var ground = SKSpriteNode()
ground.position = CGPointMake(CGRectGetMidX(self.frame), self.frame.size.height/100 * 16)
ground.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(self.frame.size.width, 1))
ground.physicsBody?.dynamic = false
ground.physicsBody?.categoryBitMask = objectGroup
// Add Ground to scene
self.addChild(ground)
// Create Top
var top = SKSpriteNode()
top.position = CGPointMake(0, self.frame.size.height)
top.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(self.frame.size.width, 1))
top.physicsBody?.dynamic = false
top.physicsBody?.categoryBitMask = objectGroup
// Add Top to scene
self.addChild(top)
}
/* ------------------------------------ Spawning Enemy Birds ------------------------------------------ */
/* Create and Spawn enemy birds */
func enemySpawn() {
let height = self.frame.size.height // screen height as variable
let width = self.frame.size.width // screen width as variable
var bottomBarHeight = self.frame.size.height*0.16 // bottom bar height
var spawningPoint = height - bottomBarHeight // screen height - 16%
var randSpawn = arc4random_uniform(UInt32(spawningPoint)) // random number between 0 and 645
finalSpawn = CGFloat(randSpawn) + bottomBarHeight // add 16% (bottombarheight to the random number
println(Int(finalSpawn))
if (enemyBird.position.y > frame.size.height) {
enemyBird.position.y = frame.size.height - 100
}
if (enemyBird.position.y < self.frame.size.width * 0.16) {
enemyBird.position.y = self.frame.size.width + 0.18
}
// Create enemy bird
var enemyBirdTexture = SKTexture(imageNamed: "enemy_img_2.png")
// enemyBird.position = CGPointMake(self.frame.width+200, 500)
enemyBird = SKSpriteNode(texture: enemyBirdTexture)
enemyBird.size.height = enemyBird.size.height/12
enemyBird.size.width = enemyBird.size.width/11
enemyBird.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(enemyBird.size.width/1.1, enemyBird.size.height/1.1))
enemyBird.physicsBody?.dynamic = false
enemyBird.physicsBody?.categoryBitMask = objectGroup
// BIRD LOOP - ONLY RUNNING ONCE???
let startPoint = CGPointMake(self.frame.width+200, finalSpawn)
let endPoint = CGPointMake(0, finalSpawn)
let moveToEndAction = SKAction.moveTo(endPoint, duration: 2)
let resetTostartAction = SKAction.moveTo(startPoint, duration: 0)
let moveToEndThenStartAgain = SKAction.repeatActionForever(SKAction.sequence([moveToEndAction,resetTostartAction]))
enemyBird.runAction(SKAction.repeatActionForever(moveToEndThenStartAgain))
}
/* ------------------------------------ Other Parts ------------------------------------------ */
func backgroundImage() {
/* Put Background Image In */
// Create Background Texture
var bgTexture = SKTexture(imageNamed: "bg.png")
// Link bg variable to texture
bg = SKSpriteNode(texture: bgTexture)
// Position thr bg image
bg.position = CGPoint(x: CGRectGetMidX(self.frame), y: self.frame.height/2)
bg.size.height = self.frame.height
// Move background image left
var moveBg = SKAction.moveByX(-bgTexture.size().width, y: 0, duration: 9)
var replaceBg = SKAction.moveByX(bgTexture.size().width, y: 0, duration: 0)
var moveBgForever = SKAction.repeatActionForever(SKAction.sequence([moveBg, replaceBg]))
// Keep world never ending
for var i:CGFloat = 0; i < 3; i++ {
// Position Background
bg = SKSpriteNode(texture: bgTexture)
bg.position = CGPoint(x: bgTexture.size().width/2 + bgTexture.size().width * i, y: CGRectGetMidY(self.frame))
// Stretch background full height of screen
bg.size.height = self.frame.height
// Run the action to move BG
bg.runAction(moveBgForever)
self.addChild(bg)
}
}
/* ------------------------------------ Create Bird Physics ------------------------------------------ */
func birdPhysics() {
/* Give bird physics */
// Give bird physics
bird.physicsBody = SKPhysicsBody(circleOfRadius: bird.size.height/3)
bird.physicsBody?.mass = 0.2
bird.physicsBody?.dynamic = true
bird.physicsBody?.allowsRotation = false
bird.physicsBody?.categoryBitMask = birdGroup
bird.physicsBody?.collisionBitMask = objectGroup
bird.physicsBody?.contactTestBitMask = objectGroup
}
/* ------------------------------------ If contact is found ------------------------------------------ */
func didBeginContact(contact: SKPhysicsContact) {
if contact.bodyA.categoryBitMask == objectGroup || contact.bodyB.categoryBitMask == objectGroup {
bird.removeAllActions()
bird.texture = birdDeadTexture
let action = SKAction.rotateByAngle(CGFloat(-M_PI), duration:1)
bird.runAction(SKAction.repeatActionForever(action))
if gameOver == 0 {
movingObjects.speed = 0
gameOver = 1
movingObjects.removeAllChildren()// Remove all enemies
gameOverLabel.fontName = "Helvetica"
gameOverLabel.fontSize = 25
gameOverLabel.text = "Tap to retry!"
gameOverLabel.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame)*1.5)
labelHolder.addChild(gameOverLabel)
gameOverLabel.zPosition = 9
}
}
}
/* ------------------------------------ When user touches the screen ------------------------------------------ */
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
/* Called when a touch begins */
if (Menu == 0) {
movingObjects.speed = 1
birdPhysics()
let action = SKAction.rotateByAngle(CGFloat(-M_PI), duration:1)
bird.runAction(SKAction.repeatActionForever(action))
}
if (gameOver == 0) { // Runs if game is not over
bird.physicsBody?.velocity = CGVectorMake(0, 0)
bird.physicsBody?.applyImpulse(CGVectorMake(0, 80))
Menu = 1 // Number on right is jump height
} else { // Runs if game is over
score = 0 // Score int is 0
scoreLabel.text = "0" // Score Label is 0
bird.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame)) // Position Bird in center
bird.physicsBody?.velocity = CGVectorMake(0,0) // Cannot make bird jump
labelHolder.removeAllChildren() // Removes all labels
gameOver = 0 // Sets game over to 0 so game will run
movingObjects.speed = 1
bird.texture = birdTexture
// Animate Bird
var animation = SKAction.animateWithTextures([birdTexture, birdTexture2, birdTexture3, birdTexture4], timePerFrame: 0.08)
var makeBirdFlap = SKAction.repeatActionForever(animation)
bird.runAction(makeBirdFlap)
let height = self.frame.size.height
let width = self.frame.size.width
var gameScene: GameScene = GameScene(size: CGSizeMake(width, height))
var spriteView: SKView = self.view as SKView!
var trans :SKTransition = SKTransition.crossFadeWithDuration(0.5)
spriteView.presentScene(gameScene, transition: trans)
}
}
override func update(currentTime: CFTimeInterval) {
/* Called before each frame is rendered */
if (enemyBird.position.x == 0) {
score = score + 1
scoreLabel.text = "\(score)"
}
if (enemyBird.position.y > frame.size.height) {
enemyBird.position.y = frame.size.height - enemyBird.size.height
}
} }
你可以像
一样增加分数
if (bird.position.x < 0)
{
score++
}
要循环播放敌鸟的动画，您可以制作一个从一端到另一端的循环 SKAction。比如像这样
let startPoint = CGPointMake(0, 200)
let endPoint = CGPointMake(self.frame.width, 200)
let moveToEndAction = SKAction.moveTo(endPoint, duration: 2)
let resetTostartAction = SKAction.moveTo(startPoint, duration: 0)
let moveToEndThenStartAgain = SKAction.repeatActionForever(SKAction.sequence([moveToEndAction,resetTostartAction]))
node.runAction(SKAction.repeatActionForever(moveToEndThenStartAgain))
要每次从随机高度开始，您可以使用
let maxHeight:UInt32 = 400
let startPoint = CGPointMake(0, CGFloat(arc4random() % maxHeight))
let moveToEndAction = SKAction.moveByX(self.frame.width, y: 0, duration: 1.0)
let resetTostartAction = SKAction.runBlock { () -> Void in
let randomHeight = CGFloat(arc4random() % maxHeight)
self.playButton.position = CGPointMake(startPoint.x,randomHeight)
}
let moveToEndThenStartAgain = SKAction.repeatActionForever(SKAction.sequence([moveToEndAction,resetTostartAction]))
enemyBird.runAction(SKAction.repeatActionForever(moveToEndThenStartAgain))
您可以根据需要更改maxHeight。
我似乎无法弄清楚如何让我的评分发挥作用...
游戏的概念是小鸟会从右手边进来，当它们到达左手边时，我希望我的分数增加 1。
在Obj_c我会做类似
的事情if (bird.enter.x < 0) {
score++
}
但是在 swift sprite kit 中，我不确定该怎么做...
我遇到的另一个问题是我必须使用计时器让我的 "Enemy Birds" 产卵（鸟从右到左）
（计时器每 1 秒运行一次生成敌人函数）但在 Obj_c 中我会在不同的 x 坐标处生成 3/4，就像之前的代码一样，当鸟小于 0 像素时我会 CGPointMake() 回到屏幕的另一边，这样他们就在一个恒定的循环中
有没有在 swift 中执行此操作的想法？我的代码如下：它的布局有点奇怪：
import SpriteKit
class GameScene: SKScene, SKPhysicsContactDelegate {
var bg = SKSpriteNode() // Create Background
var bird = SKSpriteNode() // Create User Bird
var scoreLabel = SKLabelNode() // Create Score Label
var score: Int = 0 // Create Score Integer
var enemyBird = SKSpriteNode() // Create Enemy Bird
var birdGroup:UInt32 = 1 // Bird Collision Group
var objectGroup:UInt32 = 2 // Enemy Collision Group
var scoreGroup:UInt32 = 3 // Score Collision Group
var gameOver = 0 // Game Over function
var movingObjects = SKNode() // ??
var gameOverLabel = SKLabelNode() // Game over label
var labelHolder = SKSpriteNode() // Holds Label - Game Over
var Menu = 0
/* Put Bird in and animate */
var birdTexture = SKTexture(imageNamed: "bird_img_1.png")
var birdTexture2 = SKTexture(imageNamed: "bird_img_2.png")
var birdTexture3 = SKTexture(imageNamed: "bird_img_3.png")
var birdTexture4 = SKTexture(imageNamed: "bird_img_4.png")
var birdDeadTexture = SKTexture(imageNamed: "bird_img_dead.png")
var finalSpawn: CGFloat = 0.0
/* ------------------------------------ Main Setup ------------------------------------------ */
override func didMoveToView(view: SKView) {
/* Setup your scene here */
println("Moved to Game Scene")
movingObjects.speed = 0
/* Call Functions */
backgroundImage()
enemySpawn()
/* Set up deletates and physics and timer */
self.physicsWorld.contactDelegate = self
self.physicsWorld.gravity = CGVectorMake(0, -5)
self.addChild(movingObjects)
self.addChild(labelHolder)
/* Load Score Text */
scoreLabel.fontName = "Helvetica"
scoreLabel.fontSize = 60
scoreLabel.text = "0"
scoreLabel.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame)+self.frame.size.height*0.3)
self.addChild(scoreLabel)
enemyBird.position = CGPointMake(self.frame.width+200, 500)
movingObjects.addChild(enemyBird)
bird = SKSpriteNode(texture: birdTexture)
bird.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame))
// Make bird smaller
bird.size.height = bird.size.height/12
bird.size.width = bird.size.width/11
// Animate Bird
var animation = SKAction.animateWithTextures([birdTexture, birdTexture2, birdTexture3, birdTexture4], timePerFrame: 0.08)
var makeBirdFlap = SKAction.repeatActionForever(animation)
bird.runAction(makeBirdFlap)
// Load Physics
// birdPhysics()
// Run bird animation
bird.zPosition = 10
self.addChild(bird)
/* Introduce ground and top into the scene */
// Create Ground
var ground = SKSpriteNode()
ground.position = CGPointMake(CGRectGetMidX(self.frame), self.frame.size.height/100 * 16)
ground.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(self.frame.size.width, 1))
ground.physicsBody?.dynamic = false
ground.physicsBody?.categoryBitMask = objectGroup
// Add Ground to scene
self.addChild(ground)
// Create Top
var top = SKSpriteNode()
top.position = CGPointMake(0, self.frame.size.height)
top.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(self.frame.size.width, 1))
top.physicsBody?.dynamic = false
top.physicsBody?.categoryBitMask = objectGroup
// Add Top to scene
self.addChild(top)
}
/* ------------------------------------ Spawning Enemy Birds ------------------------------------------ */
/* Create and Spawn enemy birds */
func enemySpawn() {
let height = self.frame.size.height // screen height as variable
let width = self.frame.size.width // screen width as variable
var bottomBarHeight = self.frame.size.height*0.16 // bottom bar height
var spawningPoint = height - bottomBarHeight // screen height - 16%
var randSpawn = arc4random_uniform(UInt32(spawningPoint)) // random number between 0 and 645
finalSpawn = CGFloat(randSpawn) + bottomBarHeight // add 16% (bottombarheight to the random number
println(Int(finalSpawn))
if (enemyBird.position.y > frame.size.height) {
enemyBird.position.y = frame.size.height - 100
}
if (enemyBird.position.y < self.frame.size.width * 0.16) {
enemyBird.position.y = self.frame.size.width + 0.18
}
// Create enemy bird
var enemyBirdTexture = SKTexture(imageNamed: "enemy_img_2.png")
// enemyBird.position = CGPointMake(self.frame.width+200, 500)
enemyBird = SKSpriteNode(texture: enemyBirdTexture)
enemyBird.size.height = enemyBird.size.height/12
enemyBird.size.width = enemyBird.size.width/11
enemyBird.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(enemyBird.size.width/1.1, enemyBird.size.height/1.1))
enemyBird.physicsBody?.dynamic = false
enemyBird.physicsBody?.categoryBitMask = objectGroup
// BIRD LOOP - ONLY RUNNING ONCE???
let startPoint = CGPointMake(self.frame.width+200, finalSpawn)
let endPoint = CGPointMake(0, finalSpawn)
let moveToEndAction = SKAction.moveTo(endPoint, duration: 2)
let resetTostartAction = SKAction.moveTo(startPoint, duration: 0)
let moveToEndThenStartAgain = SKAction.repeatActionForever(SKAction.sequence([moveToEndAction,resetTostartAction]))
enemyBird.runAction(SKAction.repeatActionForever(moveToEndThenStartAgain))
}
/* ------------------------------------ Other Parts ------------------------------------------ */
func backgroundImage() {
/* Put Background Image In */
// Create Background Texture
var bgTexture = SKTexture(imageNamed: "bg.png")
// Link bg variable to texture
bg = SKSpriteNode(texture: bgTexture)
// Position thr bg image
bg.position = CGPoint(x: CGRectGetMidX(self.frame), y: self.frame.height/2)
bg.size.height = self.frame.height
// Move background image left
var moveBg = SKAction.moveByX(-bgTexture.size().width, y: 0, duration: 9)
var replaceBg = SKAction.moveByX(bgTexture.size().width, y: 0, duration: 0)
var moveBgForever = SKAction.repeatActionForever(SKAction.sequence([moveBg, replaceBg]))
// Keep world never ending
for var i:CGFloat = 0; i < 3; i++ {
// Position Background
bg = SKSpriteNode(texture: bgTexture)
bg.position = CGPoint(x: bgTexture.size().width/2 + bgTexture.size().width * i, y: CGRectGetMidY(self.frame))
// Stretch background full height of screen
bg.size.height = self.frame.height
// Run the action to move BG
bg.runAction(moveBgForever)
self.addChild(bg)
}
}
/* ------------------------------------ Create Bird Physics ------------------------------------------ */
func birdPhysics() {
/* Give bird physics */
// Give bird physics
bird.physicsBody = SKPhysicsBody(circleOfRadius: bird.size.height/3)
bird.physicsBody?.mass = 0.2
bird.physicsBody?.dynamic = true
bird.physicsBody?.allowsRotation = false
bird.physicsBody?.categoryBitMask = birdGroup
bird.physicsBody?.collisionBitMask = objectGroup
bird.physicsBody?.contactTestBitMask = objectGroup
}
/* ------------------------------------ If contact is found ------------------------------------------ */
func didBeginContact(contact: SKPhysicsContact) {
if contact.bodyA.categoryBitMask == objectGroup || contact.bodyB.categoryBitMask == objectGroup {
bird.removeAllActions()
bird.texture = birdDeadTexture
let action = SKAction.rotateByAngle(CGFloat(-M_PI), duration:1)
bird.runAction(SKAction.repeatActionForever(action))
if gameOver == 0 {
movingObjects.speed = 0
gameOver = 1
movingObjects.removeAllChildren()// Remove all enemies
gameOverLabel.fontName = "Helvetica"
gameOverLabel.fontSize = 25
gameOverLabel.text = "Tap to retry!"
gameOverLabel.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame)*1.5)
labelHolder.addChild(gameOverLabel)
gameOverLabel.zPosition = 9
}
}
}
/* ------------------------------------ When user touches the screen ------------------------------------------ */
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
/* Called when a touch begins */
if (Menu == 0) {
movingObjects.speed = 1
birdPhysics()
let action = SKAction.rotateByAngle(CGFloat(-M_PI), duration:1)
bird.runAction(SKAction.repeatActionForever(action))
}
if (gameOver == 0) { // Runs if game is not over
bird.physicsBody?.velocity = CGVectorMake(0, 0)
bird.physicsBody?.applyImpulse(CGVectorMake(0, 80))
Menu = 1 // Number on right is jump height
} else { // Runs if game is over
score = 0 // Score int is 0
scoreLabel.text = "0" // Score Label is 0
bird.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame)) // Position Bird in center
bird.physicsBody?.velocity = CGVectorMake(0,0) // Cannot make bird jump
labelHolder.removeAllChildren() // Removes all labels
gameOver = 0 // Sets game over to 0 so game will run
movingObjects.speed = 1
bird.texture = birdTexture
// Animate Bird
var animation = SKAction.animateWithTextures([birdTexture, birdTexture2, birdTexture3, birdTexture4], timePerFrame: 0.08)
var makeBirdFlap = SKAction.repeatActionForever(animation)
bird.runAction(makeBirdFlap)
let height = self.frame.size.height
let width = self.frame.size.width
var gameScene: GameScene = GameScene(size: CGSizeMake(width, height))
var spriteView: SKView = self.view as SKView!
var trans :SKTransition = SKTransition.crossFadeWithDuration(0.5)
spriteView.presentScene(gameScene, transition: trans)
}
}
override func update(currentTime: CFTimeInterval) {
/* Called before each frame is rendered */
if (enemyBird.position.x == 0) {
score = score + 1
scoreLabel.text = "\(score)"
}
if (enemyBird.position.y > frame.size.height) {
enemyBird.position.y = frame.size.height - enemyBird.size.height
}
} }
你可以像
一样增加分数if (bird.position.x < 0)
{
score++
}
要循环播放敌鸟的动画，您可以制作一个从一端到另一端的循环 SKAction。比如像这样
let startPoint = CGPointMake(0, 200)
let endPoint = CGPointMake(self.frame.width, 200)
let moveToEndAction = SKAction.moveTo(endPoint, duration: 2)
let resetTostartAction = SKAction.moveTo(startPoint, duration: 0)
let moveToEndThenStartAgain = SKAction.repeatActionForever(SKAction.sequence([moveToEndAction,resetTostartAction]))
node.runAction(SKAction.repeatActionForever(moveToEndThenStartAgain))
要每次从随机高度开始，您可以使用
let maxHeight:UInt32 = 400
let startPoint = CGPointMake(0, CGFloat(arc4random() % maxHeight))
let moveToEndAction = SKAction.moveByX(self.frame.width, y: 0, duration: 1.0)
let resetTostartAction = SKAction.runBlock { () -> Void in
let randomHeight = CGFloat(arc4random() % maxHeight)
self.playButton.position = CGPointMake(startPoint.x,randomHeight)
}
let moveToEndThenStartAgain = SKAction.repeatActionForever(SKAction.sequence([moveToEndAction,resetTostartAction]))
enemyBird.runAction(SKAction.repeatActionForever(moveToEndThenStartAgain))
您可以根据需要更改maxHeight。