NSTimer - 如何在Swift中延迟 [英] NSTimer - how to delay in Swift

问题描述

我在延迟计算机在游戏中的移动时遇到了问题。

I have a problem with delaying computer's move in a game.

我找到了一些解决方案，但它们在我的情况下不起作用，例如

I've found some solutions but they don't work in my case, e.g.

var delay = NSTimer.scheduledTimerWithTimeInterval(4, target: self, selector: nil, userInfo: nil, repeats: false)

我试图将此功能用于 fire ，但也没有效果。

I tried to use this with function fire but also to no effects.

还有哪些其他可能性？

推荐答案

Swift 3

使用GCD：

let delayInSeconds = 4.0
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + delayInSeconds) {

    // here code perfomed with delay

}

或使用计时器：

func myPerformeCode() {

   // here code to perform
}
let myTimer : Timer = Timer.scheduledTimer(timeInterval: 4, target: self, selector: #selector(self.myPerformeCode), userInfo: nil, repeats: false)

Swift 2

使用GCD：

let seconds = 4.0
let delay = seconds * Double(NSEC_PER_SEC)  // nanoseconds per seconds
let dispatchTime = dispatch_time(DISPATCH_TIME_NOW, Int64(delay))

dispatch_after(dispatchTime, dispatch_get_main_queue(), {

   // here code perfomed with delay

})

或使用计时器：

func myPerformeCode(timer : NSTimer) {

   // here code to perform
}
let myTimer : NSTimer = NSTimer.scheduledTimerWithTimeInterval(4, target: self, selector: Selector("myPerformeCode:"), userInfo: nil, repeats: false)

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