ios - UIApplication 共享对象未提供预定通知

Question

我在我的应用程序中安排了一个通知，并创建了一个带有暂停按钮的可操作通知。在贪睡按钮处理上，我创建了另一个通知并安排了它。但是当我启动应用程序并尝试获取该预定通知时，它说 0 预定通知，并且当我在杀死它后再次启动应用程序时。它发出通知。

怎么了，为什么它没有第一时间给我预定的通知。

func application(application: UIApplication, handleActionWithIdentifier identifier: String?, forLocalNotification notification: UILocalNotification, completionHandler: () -> Void) {

    if identifier == Constants.NOTIFICATION_CATEGORY_ACTION_RESUME {
    // do something
    } else if identifier == Constants.NOTIFICATION_CATEGORY_ACTION_SNOOZE {
    // extracting time from notification user info and scheduling another notification of same time
      let userInfo = notification.userInfo
      let newNotification = UILocalNotification()
      let timeInterval = userInfo!["timeInterval"] as! NSTimeInterval
      newNotification.fireDate = NSDate(timeIntervalSinceNow: timeInterval)
      if #available(iOS 8.2, *) {
        newNotification.alertTitle = Utilities.getLocalizedString("NotificationAlertTitle")
      } else {
        // Fallback on earlier versions
      }
      newNotification.alertBody = Utilities.getLocalizedString("NotificationAlertBody")
      newNotification.alertAction = Utilities.getLocalizedString("NotificationAlertAction")
      newNotification.soundName = UILocalNotificationDefaultSoundName
      newNotification.category = Constants.CATEGORY_NAME
      // use this to store previous time
      let date = NSDate()
      newNotification.userInfo = [Constants.NOTIFICATIONUSERINFO_TIMEINTERVAL : timeInterval, Constants.NOTIFICATIONUSERINFO_TAG : Constants.NOTIFICATION_TAG, Constants.NOTIFICATIONUSERINFO_SETTIME : date.timeIntervalSince1970]

      UIApplication.sharedApplication().cancelAllLocalNotifications()
      UIApplication.sharedApplication().scheduleLocalNotification(newNotification)
    }
    completionHandler()
  }

Answer 1

因为你已经使用了这个方法UIApplication.sharedApplication().cancelAllLocalNotifications()。并且此方法取消了所有预定的通知列表。您可以使用 UIApplication.sharedApplication().cancelLocalNotification(YourSpecificNotification) 取消特定的预定通知。在创建新的本地通知时不要调用任何 cancelLocalNotification 方法。