iOS覆盖本地通知 [英] IOS Overriding Local Notifications

问题描述

我创建了一个Local Notification，当单击某个按钮(SetButton)时会触发60秒.我现在的问题是，如果再次按下SetButton，它不会覆盖第一次按下，它显示2条通知，依此类推.如何确保第二次按此按钮会覆盖第一次按的按钮，并且没有通知的累积?

I created a Local Notification that triggers 60 seconds when a certain button(SetButton) is clicked. My problem right now is if SetButton is pressed again, it does not override the first press, it displays 2 notifications and so on. How do I make sure that the second press of the button overrides the first press and there isn't a build up of notifications ?

- (IBAction)SetButtonPressed:(id)sender {
      UILocalNotification *localNotification = [[UILocalNotification alloc] init];
      localNotification.fireDate = [NSDate dateWithTimeIntervalSinceNow:60];
      localNotification.alertBody = @"HEY GET UP";
      localNotification.timeZone = [NSTimeZone defaultTimeZone];
      localNotification.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;

}

我的AppDelegate.m

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     UILocalNotification *localNotification = [launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];
     if ([UIApplication instanceMethodForSelector: @selector(registerUserNotificationSettings:)]) {
         [application registerUserNotificationSettings: [UIUserNotificationSettings settingsForTypes: UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound categories:nil]];
     }

     if (localNotification) {
        application.applicationIconBadgeNumber = 0;
     }
}

推荐答案

如果您仅对该特定操作使用通知，则可以使用

If you only use notifications for that specific action you could cancel all notifications at once using

[[UIApplication sharedApplication] cancelAllLocalNotifications];

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