Swift 为什么应用程序在调用函数时会滞后很多

我正在构建一个游戏，它需要根据条件是否为真调用一个函数（从几个函数中选择）。出于游戏目的，条件每0.0001秒检查一次变量，但函数每4-6秒调用一次。我只是需要这个

每当我在一台设备上测试游戏时，我都会注意到该应用程序在某些时间滞后。我相信它是在函数被调用时发生的，但我不确定

这是一个SKAction，调用检查条件的函数：

let triangle = SKAction.sequence([SKAction.run(obstaclesFunc),SKAction.wait(forDuration: 0.0001)])

run(SKAction.repeatForever(triangle))

这是条件检查器：

  func obstaclesFunc() {
    GameScene.nextObstacle = Int(arc4random_uniform(6) + 1 )

    if(GameScene.first == true){
        GameScene.randomNum = 1     
    }

    if (GameScene.pass == true){
    number = GameScene.nextObstacle
        print(number)

     //Rectangle Call Function
    if(GameScene.randomNum == 1){

       sideRectangles()

      //More code at bottom 
    }

我注意到最大的延迟发生在调用此函数时：

func sideRectangles() {

    let rectangle1 = SKSpriteNode(imageNamed: "rectangleWalls")
    let rectangle2 = SKSpriteNode(imageNamed: "rectangleWalls")
    let rectangle3 = SKSpriteNode(imageNamed: "rectangleWalls")

    let rectangleTexture = SKTexture(imageNamed: "rectangleWalls")

    //Physics World
    rectangle1.physicsBody = SKPhysicsBody(texture: rectangleTexture, size: CGSize(width: rectangle1.size.width - 20, height: rectangle1.size.height - 20))
    rectangle1.physicsBody?.categoryBitMask = PhysicsNumbering.rectangle_1
    rectangle1.physicsBody?.contactTestBitMask = PhysicsNumbering.player
    rectangle1.physicsBody?.affectedByGravity = false
    rectangle1.physicsBody?.isDynamic = true
    rectangle1.physicsBody?.collisionBitMask = 0

    //Physics World
    rectangle2.physicsBody = SKPhysicsBody(texture: rectangleTexture, size: CGSize(width: rectangle1.size.width - 20, height: rectangle1.size.height - 20))
    rectangle2.physicsBody?.categoryBitMask = PhysicsNumbering.rectangle_2
    rectangle2.physicsBody?.contactTestBitMask = PhysicsNumbering.player
    rectangle2.physicsBody?.affectedByGravity = false
    rectangle2.physicsBody?.isDynamic = true
    rectangle2.physicsBody?.collisionBitMask = 0

    //Physics World
    rectangle3.physicsBody = SKPhysicsBody(texture: rectangleTexture, size: CGSize(width: rectangle1.size.width - 20, height: rectangle1.size.height - 20))
    rectangle3.physicsBody?.categoryBitMask = PhysicsNumbering.rectangle_3
    rectangle3.physicsBody?.contactTestBitMask = PhysicsNumbering.player
    rectangle3.physicsBody?.affectedByGravity = false
    rectangle3.physicsBody?.isDynamic = true
    rectangle3.physicsBody?.collisionBitMask = 0

    let moveDown = SKAction.moveTo(y: self.frame.minY - rectangle3.size.height / 2, duration: 2)
    let moveDown2 = SKAction.moveTo(y: self.frame.minY - rectangle3.size.height / 2, duration: 3)
    let moveDown3 = SKAction.moveTo(y: self.frame.minY - rectangle3.size.height / 2, duration: 4)

    let removeNode = SKAction.removeFromParent()

    rectangle1.position = CGPoint(x: self.frame.minX - rectangle3.size.height * 0.1, y: self.frame.maxY + rectangle3.size.width) //use 4.5 for the close one
    rectangle2.position = CGPoint(x: self.frame.minX - rectangle3.size.width / 40 , y: self.frame.maxY + rectangle3.size.height) //use 4.5 for the close one
    rectangle3.position = CGPoint(x: self.frame.midX - rectangle3.size.width / 1.55, y: self.frame.maxY + rectangle3.size.height * 1.8)

    rectangle1.run(SKAction.sequence([moveDown,removeNode]))
    rectangle2.run(SKAction.sequence([moveDown2,removeNode]))
    rectangle3.run(SKAction.sequence([moveDown3,removeNode]))

    //second set
    let rectangle5 = SKSpriteNode(imageNamed: "rectangleWalls")
    let rectangle6 = SKSpriteNode(imageNamed: "rectangleWalls")
    let rectangle7 = SKSpriteNode(imageNamed: "rectangleWalls")

    //Physics World
    rectangle5.physicsBody = SKPhysicsBody(texture: rectangleTexture, size: CGSize(width: rectangle1.size.width - 20, height: rectangle1.size.height - 20))
    rectangle5.physicsBody?.categoryBitMask = PhysicsNumbering.rectangle_5
    rectangle5.physicsBody?.contactTestBitMask = PhysicsNumbering.player
    rectangle5.physicsBody?.affectedByGravity = false
    rectangle5.physicsBody?.isDynamic = true
    rectangle5.physicsBody?.collisionBitMask = 0

    //Physics World
    rectangle6.physicsBody = SKPhysicsBody(texture: rectangleTexture, size: CGSize(width: rectangle1.size.width - 20, height: rectangle1.size.height - 20))
    rectangle6.physicsBody?.categoryBitMask = PhysicsNumbering.rectangle_6
    rectangle6.physicsBody?.contactTestBitMask = PhysicsNumbering.player
    rectangle6.physicsBody?.affectedByGravity = false
    rectangle6.physicsBody?.isDynamic = true
    rectangle6.physicsBody?.collisionBitMask = 0

    //Physics World
    rectangle7.physicsBody = SKPhysicsBody(texture: rectangleTexture, size: CGSize(width: rectangle1.size.width - 20, height: rectangle1.size.height - 20))
    rectangle7.physicsBody?.categoryBitMask = PhysicsNumbering.rectangle_7
    rectangle7.physicsBody?.contactTestBitMask = PhysicsNumbering.player
    rectangle7.physicsBody?.affectedByGravity = false
    rectangle7.physicsBody?.isDynamic = true
    rectangle7.physicsBody?.collisionBitMask = 0

    rectangle5.zPosition = 0
    rectangle6.zPosition = 0
    rectangle7.zPosition = 0

    rectangle5.position = CGPoint(x: self.frame.maxX + rectangle3.size.height * 0.1, y: self.frame.maxY + rectangle3.size.width) //use 4.5 for the close one
    rectangle6.position = CGPoint(x: self.frame.maxX + rectangle3.size.width / 40 , y: self.frame.maxY + rectangle3.size.height) //use 4.5 for the close one
    rectangle7.position = CGPoint(x: self.frame.midX + rectangle3.size.width / 1.55, y: self.frame.maxY + rectangle3.size.height * 1.8)

    rectangle5.run(SKAction.sequence([moveDown,removeNode]))
    rectangle6.run(SKAction.sequence([moveDown2,removeNode]))
    rectangle7.run(SKAction.sequence([moveDown3,removeNode]))

    addChild(rectangle1)
    addChild(rectangle2)
    addChild(rectangle3)
    addChild(rectangle5)
    addChild(rectangle6)
    addChild(rectangle7)
}

---

有人能帮我找出是什么导致了这种滞后吗？我似乎想不出来。提前谢谢你

动态生成物理实体非常昂贵，这就是为什么每次尝试生成物理实体时，游戏都会出现延迟

我建议您创建对象并将它们放入障碍物阵列中，然后在需要重新创建它们时复制阵列项

你有太多的代码被每个对象重复，我试图通过对每个障碍重用大量代码来减少代码量

仅供参考，SKAction.wait（forDuration:0.0001）与0相同，因此没有意义

你的obstaclesFunc中的代码包含不相关的或者你的问题中没有包含的代码，所以我省略了这个功能，如果它对你的游戏来说是可怕的，你必须找出它并把它放到generateObstacles func中

//variables needed in your scene
private var rectangles = [SKSpriteNode]()
private var moveDown: SKAction!
private var moveDown2: SKAction!
private var moveDown3: SKAction!
private var removeNode: SKAction!

//in your didMove func
//preload the obstacles into an array
createRectangles()

//in your startGame func
//this func call will start the generation of the obstacles
generateObstacles()

func createRectangles() {

    let rectangle1 = createRectangle(category: PhysicsNumbering.rectangle_1)
    rectangles.append(rectangle1)

    let rectangle2 = createRectangle(category: PhysicsNumbering.rectangle_2)
    rectangles.append(rectangle2)

    let rectangle3 = createRectangle(category: PhysicsNumbering.rectangle_3)
    rectangles.append(rectangle3)

    let rectangle5 = createRectangle(category: PhysicsNumbering.rectangle_5)
    rectangles.append(rectangle5)

    let rectangle6 = createRectangle(category: PhysicsNumbering.rectangle_6)
    rectangles.append(rectangle6)

    let rectangle7 = createRectangle(category: PhysicsNumbering.rectangle_7)
    rectangles.append(rectangle7)

    let width: CGFloat = rectangle3.size.width
    let height: CGFloat = rectangle3.size.height

    //position the rectangles afterward creating them since they appear to be relevant to each other
    rectangle1.position = CGPoint(x: frame.minX - height * 0.1, y: frame.maxY + width) //use 4.5 for the close one
    rectangle2.position = CGPoint(x: frame.minX - width / 40 , y: frame.maxY + height) //use 4.5 for the close one
    rectangle3.position = CGPoint(x: frame.midX - width / 1.55, y: frame.maxY + height * 1.8)
    rectangle5.position = CGPoint(x: frame.maxX + height * 0.1, y: frame.maxY + width) //use 4.5 for the close one
    rectangle6.position = CGPoint(x: frame.maxX + width / 40 , y: frame.maxY + height) //use 4.5 for the close one
    rectangle7.position = CGPoint(x: frame.midX + width / 1.55, y: frame.maxY + height * 1.8)

    //now create the actions so that they can be used again and again
    createActions(height: height / 2)
}

func createActions(height: CGFloat) {

    moveDown = SKAction.moveTo(y: frame.minY - height, duration: 2)
    moveDown2 = SKAction.moveTo(y: frame.minY - height, duration: 3)
    moveDown3 = SKAction.moveTo(y: frame.minY - height, duration: 4)
    removeNode = SKAction.removeFromParent()
}

func generateObstacles() {

    let randomWaitTime = Int(arc4random_uniform(6) + 1 )

    self.run(.wait(forDuration: randomWaitTime) {
        loadAndMoveRectangles()

        //now call the generate func again to get a diff random time to wait
        generateObstacles()
    }
}

func loadAndMoveRectangles() {

    let rectangle1 = rectangles[0].copy() as? SKSpriteNode
    addChild(rectangle1)

    let rectangle2 = rectangles[1].copy() as? SKSpriteNode
    addChild(rectangle2)

    let rectangle3 = rectangles[2].copy() as? SKSpriteNode
    addChild(rectangle3)

    let rectangle5 = rectangles[3].copy() as? SKSpriteNode
    addChild(rectangle5)

    let rectangle6 = rectangles[4].copy() as? SKSpriteNode
    addChild(rectangle6)

    let rectangle7 = rectangles[5].copy() as? SKSpriteNode
    addChild(rectangle7)

    rectangle1.run(.sequence([moveDown, removeNode]))
    rectangle2.run(.sequence([moveDown2, removeNode]))
    rectangle3.run(.sequence([moveDown3, removeNode]))

    rectangle5.run(.sequence([moveDown, removeNode]))
    rectangle6.run(.sequence([moveDown2, removeNode]))
    rectangle7.run(.sequence([moveDown3, removeNode]))
}

func createRectangle(category: UInt32) -> SKSpriteNode {

    let rectangle = SKSpriteNode(imageNamed: "rectangleWalls")
    rectangle.zPosition = 0

    rectangle.physicsBody = SKPhysicsBody(texture: rectangleTexture, size: CGSize(width: rectangle1.size.width - 20, height: rectangle1.size.height - 20))
    rectangle.physicsBody?.categoryBitMask = category
    rectangle.physicsBody?.contactTestBitMask = PhysicsNumbering.player
    rectangle.physicsBody?.affectedByGravity = false
    rectangle.physicsBody?.isDynamic = true
    rectangle.physicsBody?.collisionBitMask = 0

    return rectangle
}

---

我真的不认为轮询变量是正确的方法。您可以使用KVO在值更改时创建通知，这意味着您正在限制操作。我非常确定等待0.00001与等待0.00001不同，但当我有机会时，需要再次检查这一点。0将只在1个更新周期上运行，但0.00001将在2hmmm上运行，这很有趣。我假设，因为最大帧速率可能是每秒0.016次的60fps。因此，任何小于0的值都将等于0。在下一个更新周期之前，它不会应用经过的时间，因此在第一个运行块经过的时间为0，0<0.00001，然后下一次更新，0.016<0.00001为假，因此完成。再次需要确认这个行为。我也会测试一下，如果是这样的话，我会很乐意从答案中删除我的评论。这不会影响我的答案，因为我没有用它来控制时间。不，我会尝试用这个答案来帮助你，但我很难理解OP的发展方向