ios - 如何在 iOS 中安排可以暂停或删除的本地通知？

Question

我正在尝试使用以下 iOS 库实现本地前台通知:https://github.com/kunass2/BSForegroundNotification

我希望在倒计时达到 0 后触发通知，但无法找到一种好方法来实现计时器上的暂停和重新启动按钮，同时暂停通知或设置新通知。

这是我当前的实现，它会失败，因为如果我按重新启动打算为重置计时器启用新通知的触发，旧通知也会被触发:

func setupLocalNotifications() { // called whenever current timer countdown reaches 0
let notification = BSForegroundNotification(userInfo: userInfoForCategory("ONE_BUTTON"))
    notification.timeToDismissNotification = NSTimeInterval(10)
    // Delay 10 seconds
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, Int64(self.timeRemaining * Double(NSEC_PER_SEC))), dispatch_get_main_queue()) { () -> Void in
        if self.willDisplayForegroundNotification {
            notification.presentNotification()
        }
    }
    notification.delegate = self
}

@IBAction func startPauseButtonPressed(sender: AnyObject) {
        if self.counting {
            self.timer?.invalidate()
            UIApplication.sharedApplication().cancelAllLocalNotifications()
            self.willDisplayForegroundNotification = false
            self.counting = false
            startPauseButton.setTitle("Resume", forState: .Normal)
            startPauseButton.setImage(UIImage(named: "Play.png"), forState: .Normal)
        }
        else {
            setupLocalNotifications()
            self.timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: #selector(NewFocusViewController.countdown), userInfo: nil, repeats: true)
            self.willDisplayForegroundNotification = true
            self.counting = true
            startPauseButton.setTitle("Pause", forState: .Normal)    
        }
}

@IBAction func restartButtonPressed(sender: AnyObject) {
    self.timer?.invalidate()
    UIApplication.sharedApplication().cancelAllLocalNotifications()
    self.timeRemaining = Double(self.timeMax)
    self.counting = false
    self.willDisplayForegroundNotification = false
    self.updateTimer()
    self.startPauseButton.setTitle("Start", forState: .Normal)
}

Answer 1

我通过在 App Delegate 中实现 didReceiveLocalNotification() 方法来呈现前台通知，解决了这个问题。