如何在swift中按下按钮取消localNotification？ [英] how to cancel a localNotification with the press of a button in swift?

问题描述

我只需点击一个按钮即可安排基于 UILocalNotification 的位置。但是当我尝试通过再次单击相同的按钮取消localNotification时，它不会取消通知。
我正在使用 UIApplication.sharedApplication（）。cancellocalNotification（localNotification）
取消我的预定位置的本地通知。
我做错了什么？
这里是我的实现

I am scheduling a location based UILocalNotification with the click of a button . But when i try to cancel the localNotification by clicking the same button again, it doesn't cancel the notification. I am using UIApplication.sharedApplication().cancelLocalNotification(localNotification) to cancel my scheduled location based local notification. What am i doing wrong ? here is my implementation

@IBAction func setNotification(sender: UIButton!) {
    if sender.tag == 999 {
        sender.setImage(UIImage(named: "NotificationFilled")!, forState: .Normal)
        sender.tag = 0
        regionMonitor() //function where notification get scheduled

    } else {
        sender.setImage(UIImage(named: "Notification")!, forState: .Normal)
        sender.tag = 999 }

我应该在else块中输入什么，以便取消预定的通知。无法清除所有通知。
这里是 didEnterRegion 块代码，其中我触发本地通知

what should i enter into the else block so that the scheduled notification gets canceled. Cannot clear all notifications. here is the didEnterRegion block code where i trigger the local notification

func locationManager(manager: CLLocationManager!, didEnterRegion region: CLRegion!) {
    localNotification.regionTriggersOnce = true
    localNotification.alertBody = "Stack Overflow is great"
    UIApplication.sharedApplication().scheduleLocalNotification(localNotification)
    NSLog("Entering region")
}

推荐答案

如果在您的上下文中这是可接受的，您可以尝试删除所有通知。
像这样：

You could try to remove all notifications if this is acceptable in your context. Like this:

for notification in UIApplication.sharedApplication().scheduledLocalNotifications as! [UILocalNotification] { 
  UIApplication.sharedApplication().cancelLocalNotification(notification)
}

或者如Logan所述：

Or as stated by Logan:

UIApplication.sharedApplication().cancelAllLocalNotifications()

或者如Gerard Grundy对Swift 4所述：

Or as stated by Gerard Grundy for Swift 4:

UNUserNotificationCenter.current().removeAllPendingNotificat‌​ionRequests()

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