我如何在 Swift 中永远重复一个动作? [英] How would I repeat an action forever in Swift?

问题描述

http://i.imgur.com/xkWTk9i.png 我已经得到了这个矩形从上到下.我的问题是我希望它每 2 秒重复一次，所以另一个矩形跟随它.我希望我的代码每 2 秒生成一次矩形，并让它像在飞扬的鸟中使用绿色管道一样重复.谢谢你.(我之前让这个工作，但我错误地删除了我的项目，并且无法弄清楚我是如何做到的.)我在使用 Spritekit 的 Swift 中.

http://i.imgur.com/xkWTk9i.png I already got this rectangle to go from top to bottom. The problem I have is that I want it to repeat every 2 seconds so another rectangle is following it. I want my code to spawn the rectangles every 2 seconds and have it repeat like in flappy bird does with the green pipes. Thank you. (I got this to work before but I deleted my project by mistake and cant figure out how I did it in the first place.) Im in Swift using Spritekit.

.

 class GameScene: SKScene {
   let sprite = SKSpriteNode(imageNamed: "Rectangle 12")

   override func didMoveToView(view: SKView) {
     self.addChild(sprite)

      //run doAction function
      doAction()

   }


   //movement of rectangle


  func createRectangle() {
    let moveToBottom = SKAction.moveByX(0, y: 0 - self.frame.size.width , duration:  
    NSTimeInterval (3.0))

    let removeTheNode = SKAction.removeFromParent()
    let moveAndRemovePipes = SKAction.sequence([moveToBottom, removeTheNode])
    let repeatAction = SKAction.repeatActionForever(moveAndRemovePipes)
    sprite.xScale = 1
    sprite.yScale = 1
    sprite.position = CGPoint(x:0,y:0)
    sprite.runAction(repeatAction)


  }
  //spawn multiple rectangles after 3 or 4 seconds

  func doAction() {
    let generateRectangles = SKAction.sequence([
    SKAction.runBlock(self.createRectangle),
    SKAction.waitForDuration(NSTimeInterval(3.0))])
    let endlessAction = SKAction.repeatActionForever(generateRectangles)
    runAction(endlessAction)
  }
}

推荐答案

您可以使用 NSTimer 重复执行函数.

You can repeat the function execution with NSTimer.

override func didMoveToView(view: SKView) {
     self.addChild(sprite)

       var timer = NSTimer.scheduledTimerWithTimeInterval(0.2, target: self, selector: "doAction", userInfo: nil, repeats: true)

   }

这将每 2 秒重复执行一次函数.

This will repeat your function execution for every 2 second.

你也可以这样做:

override func didMoveToView(view: SKView) {
 self.addChild(sprite)

 runAction(SKAction.repeatActionForever(SKAction.sequence([SKAction.runBlock(doAction), SKAction.waitForDuration(1.0)])))

}

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