swift - 当 WKInterfaceTimer 达到 0 时打印到控制台

Question

我想看到我的程序知道计时器何时结束。我在 Xcode 7 Beta 3 (7A152u) 中使用 WKInterfaceTimer。当计数器正在倒计时时，“Tick Tock”打印到控制台。但是当它达到 0 时，“Timer Done”不会打印。

    @IBOutlet var myTimer: WKInterfaceTimer!

    @IBAction func startButton() {
        myTimer.start()
        myTimer.setDate(NSDate(timeIntervalSinceNow: 4)) // Arbitrary 4 second coundown.

        // Impliment an alert.
        if myTimer == 0 {
            print("Timer Done")

        } else {
        print("Tick Tock")

    }
}

Answer 1

这是我想出的解决方案。现在，计时器结束时的警报只是用“完成”打印到控制台。非常感谢用户 Prawn，因为我在此解决方案中使用了他的一些代码。

import WatchKit
import Foundation

var myTimer : NSTimer?
var elapsedTime : NSTimeInterval = 0.0
var startTime = NSDate()
var duration : NSTimeInterval = 4.0 //Arbitrary 4 seconds to test timer.


class InterfaceController: WKInterfaceController {

override func awakeWithContext(context: AnyObject?) {
    super.awakeWithContext(context)
    WKTimer.setDate(NSDate(timeIntervalSinceNow: duration))

}


override func willActivate() {
    super.willActivate()

}

@IBOutlet var WKTimer: WKInterfaceTimer! //The WatchKit timer the user sees

@IBAction func startButton()  { //Start button

    NSTimer.scheduledTimerWithTimeInterval(duration, target: self, selector: ("timerDone"), userInfo: nil, repeats: false)
    WKTimer.setDate(NSDate(timeIntervalSinceNow: duration ))
    WKTimer.start()

}


//Reset button resets the timer back to the original time set.
@IBAction func resetButton() {
    WKTimer.stop()
    WKTimer.setDate(NSDate(timeIntervalSinceNow: duration))

}


func timerDone() {
    print("Done")

}


override func didDeactivate() {
    // This method is called when watch view controller is no longer visible
    super.didDeactivate()
}

}