ios - WatchOS2中使用NSTimeInterval触发通知

Question

我正在尝试在 Apple Watch (OS2) 上制作番茄钟应用程序。我想在倒计时完成后触发通知，第一步我尝试在控制台中打印一些单词，但它仍然不起作用。如何使用 NSTimeInterval 来获取执行此操作的剩余时间？

  import WatchKit
  import Foundation


  class InterfaceController: WKInterfaceController {

let countdown:NSTimeInterval = 1501

var timerRunning = false

@IBOutlet var pauseButton: WKInterfaceButton!

@IBOutlet var timer: WKInterfaceTimer!

override func awakeWithContext(context: AnyObject?) {
    super.awakeWithContext(context)
}

override func willActivate() {
    super.willActivate()
}

override func didDeactivate() {
    super.didDeactivate()
}

@IBAction func startPomodoro() {

    let date = NSDate(timeIntervalSinceNow: countdown)
    timer.setDate(date)
    timer.start();
    WKInterfaceDevice.currentDevice().playHaptic(.Start)
    WKInterfaceDevice.currentDevice().playHaptic(.Start)
}


@IBAction func resetPomodoroTimer() {
    timer.stop()
    let resetCountdown:NSTimeInterval = 1501
    let date = NSDate(timeIntervalSinceNow: resetCountdown)

    timer.setDate(date)
    WKInterfaceDevice.currentDevice().playHaptic(.Retry)
    WKInterfaceDevice.currentDevice().playHaptic(.Retry)
}


@IBAction func pausePomodoro() {
    timer.stop()

    if !timerRunning{
        pauseButton.setTitle("Restart")
    }
    WKInterfaceDevice.currentDevice().playHaptic(.Stop)
    WKInterfaceDevice.currentDevice().playHaptic(.Stop)
}

func showNotification(){

    if countdown < 1490
    {
        print("Notification")
        WKInterfaceDevice.currentDevice().playHaptic(.Success)
        WKInterfaceDevice.currentDevice().playHaptic(.Success)
    }
}  
}

Answer 1

要在 WKInterfaceTimer 完成后触发通知，您必须添加具有相同时间间隔的 NSTimer。您同时启动两者，当 NSTimer 触发时，您知道 WKInterfaceTimer 也完成了。恕我直言，这不是一个非常优雅的解决方案，但苹果的文档中建议了它，所以显然没有其他方法可以做到这一点。

如果您想添加暂停/重新启动功能，您必须跟踪用户点击“暂停”时的剩余时间并停止两个计时器。当用户再次启动计时器时，您将两个计时器设置为剩余时间并启动它们。

这是一个具有暂停/重新启动功能的工作示例(它有一个连接到 button 导出的 WKInterfaceButton 和 didPressButton: 操作:

enum TimerState {
    case Idle, Running, Paused, Finished
}

class InterfaceController: WKInterfaceController {

    let countdownDuration: NSTimeInterval = 10
    var remainingDuration: NSTimeInterval = 10
    var timer: NSTimer?
    var timerState = TimerState.Idle

    @IBOutlet var interfaceTimer: WKInterfaceTimer!
    @IBOutlet var button: WKInterfaceButton!

    @IBAction func didPressButton() {

        switch timerState {
        case .Idle:
            startTimer(remainingDuration: countdownDuration)
        case .Running:
            let fireDate = timer!.fireDate
            remainingDuration = fireDate.timeIntervalSinceDate(NSDate())
            interfaceTimer.stop()
            timer?.invalidate()
            button.setTitle("Continue")
            timerState = .Paused
        case .Paused:
            startTimer(remainingDuration: remainingDuration)
        case .Finished:
            break
        }
    }

    func startTimer(remainingDuration duration:NSTimeInterval) {
        interfaceTimer.setDate(NSDate(timeIntervalSinceNow: duration))
        interfaceTimer.start()
        timer = NSTimer.scheduledTimerWithTimeInterval(duration, target: self, selector: Selector("timerDidFire:"), userInfo: nil, repeats: false)
        button.setTitle("Pause")
        timerState = .Running
    }

    func timerDidFire(timer: NSTimer) {
        interfaceTimer.stop()
        timerState = .Finished
        WKInterfaceDevice.currentDevice().playHaptic(.Success)
    }
}