xcode 我如何在 Swift 中永远重复一个动作？
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How would I repeat an action forever in Swift?
提问by user3886268
http://i.imgur.com/xkWTk9i.pngI 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.
http://i.imgur.com/xkWTk9i.png我已经让这个矩形从上到下。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。
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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)
}
}
回答by Dharmesh Kheni
You can repeat the function execution with NSTimer.
您可以使用 重复执行函数NSTimer。
override func didMoveToView(view: SKView) {
self.addChild(sprite)
var timer = NSTimer.scheduledTimerWithTimeInterval(0.2, target: self, selector: "doAction", userInfo: nil, repeats: true)
}
This will repeat your function execution for every 2 second.
这将每 2 秒重复执行一次函数。
EDIT :
编辑 ：
You can do it this way too :
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)])))
}
回答by Aaron Halvorsen
run(SKAction.repeatForever(SKAction.sequence([SKAction.run(doAction), SKAction.wait(forDuration: 2.0)])))
