在 Swift 中使用 NSTimer [英] Using an NSTimer in Swift

问题描述

在这种情况下，timerFunc() 永远不会被调用.我错过了什么?

In this scenario, timerFunc() is never called. What am I missing?

class AppDelegate: NSObject, NSApplicationDelegate {

    var myTimer: NSTimer? = nil

    func timerFunc() {
        println("timerFunc()")
    }

    func applicationDidFinishLaunching(aNotification: NSNotification?) {
        myTimer = NSTimer(timeInterval: 5.0, target: self, selector:"timerFunc", userInfo: nil, repeats: true)
    }
}

推荐答案

您可以创建一个定时计时器，它会自动将自己添加到 runloop 并开始触发:

You can create a scheduled timer which automatically adds itself to the runloop and starts firing:

Swift 2

NSTimer.scheduledTimerWithTimeInterval(0.5, target: self, selector: "timerDidFire:", userInfo: userInfo, repeats: true)

斯威夫特 3、4、5

Timer.scheduledTimer(withTimeInterval: 0.5, target: self, selector: #selector(timerDidFire(_:)), userInfo: userInfo, repeats: true)

或者，您可以保留当前代码，并在准备好时将计时器添加到运行循环中:

Or, you can keep your current code, and add the timer to the runloop when you're ready for it:

Swift 2

let myTimer = NSTimer(timeInterval: 0.5, target: self, selector: "timerDidFire:", userInfo: nil, repeats: true)
NSRunLoop.currentRunLoop().addTimer(myTimer, forMode: NSRunLoopCommonModes)

斯威夫特 3、4、5

let myTimer = Timer(timeInterval: 0.5, target: self, selector: #selector(timerDidFire(_:)), userInfo: nil, repeats: true)
RunLoop.current.add(myTimer, forMode: RunLoop.Mode.common)

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