Question

我正在处理一个如果被终止则无效的应用程序。它有一些后台任务。如果应用程序被终止，我想显示本地通知。有些应用程序执行此操作意味着这是可行的。但我无法找到办法。

我尝试在applicationWillTerminate：appdelegate方法中设置本地通知，并在我的viewcontroller中添加了应用终止的通知，但实际终止app时没有调用任何方法。

- (void)applicationWillTerminate:(UIApplication *)application
{
    NSLog(@"terminated");
    UIApplication * app = [UIApplication sharedApplication];
    NSDate *date = [[NSDate date] dateByAddingTimeInterval:15];
    UILocalNotification *alarm = [[UILocalNotification alloc] init] ;
    if (alarm) {
        alarm.fireDate = [NSDate date];
        alarm.timeZone = [NSTimeZone defaultTimeZone];
        alarm.repeatInterval = 0;
        alarm.alertBody = @"This app does not work if terminated";
        alarm.alertAction = @"Open";
        [app scheduleLocalNotification:alarm];
    }

    [app presentLocalNotificationNow:alarm];
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}

任何帮助都会很棒。

提前致谢!!!

Answer 1

应用程序可以在“未来”日期和时间创建本地通知，该日期和时间可用于通知用户应用程序已终止。如果他们然后点击应用程序，他们就可以重新启动您的应用程序。

这适用于我的应用程序，它在info.plist中使用/需要Bluetooth Central（因此它将在后台运行）。我假设您已将应用程序配置为在info.plist中的后台运行。

- (void)applicationWillTerminate:(UIApplication *)application
{
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    // Schedule an alarm here to warn the user that they have terminated an application and if they want to re-activate it.

    NSDate * theDate = [[NSDate date] dateByAddingTimeInterval:10]; // set a localnotificaiton for 10 seconds

    UIApplication* app = [UIApplication sharedApplication];
    NSArray*    oldNotifications = [app scheduledLocalNotifications];


    // Clear out the old notification before scheduling a new one.
    if ([oldNotifications count] > 0)
        [app cancelAllLocalNotifications];

    // Create a new notification.
    UILocalNotification* alarm = [[UILocalNotification alloc] init];
    if (alarm)
    {
        alarm.fireDate = theDate;
        alarm.timeZone = [NSTimeZone defaultTimeZone];
        alarm.repeatInterval = 0;
        alarm.soundName = @"sonar";
        alarm.alertBody =@"Background uploads are disabled. Tap here to re-activate uploads." ;

        [app scheduleLocalNotification:alarm];
    }

}

Answer 2

当您的应用在后台暂停时，您将不会收到任何通知。

iOS将为您的应用程序进度发送kill -9信号，您的应用程序刚被杀死，这与用户从快速启动托盘中杀死您的应用时发生的情况相同。

来自Apple documentation：

即使您使用iOS SDK 4及更高版本开发应用程序，您仍然必须准备好让您的应用程序在没有任何通知的情况下被杀死该用户可以使用多任务UI显式杀死应用程序。此外，如果内存受限制，系统可能会删除应用程序记忆，以腾出更多空间。暂停的应用程序不会收到通知终止，但如果您的应用当前正在后台运行状态（而不是暂停），系统调用 applicationWillTerminate：您的应用委托的方法。你的应用不能从此方法请求额外的后台执行时间。

Answer 3

我和你一样有同样的问题。但是，我发现如果我没有设置fireDate，它就会开始工作。

- (void)applicationWillTerminate:(UIApplication *)application
{
//Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:

#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_6_1
    if(floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_6_1){
        //Annoy The User - Set a badge
        [application setApplicationIconBadgeNumber:1];

        //Try and alert the user
        UILocalNotification *notification = [[UILocalNotification alloc] init];
        notification.alertBody = @"Tracking disabled. Tap to resume.";
        notification.soundName = UILocalNotificationDefaultSoundName;
        [application scheduleLocalNotification:notification];
    }
#endif
}

我必须警告你，它不适用于空应用程序。它适用于我的应用程序，它在内存中有很多视图，因此它必须与释放内存所需的时间相关。

w ^

Answer 4

从应用程序双击主页按钮并滑动以终止应用程序始终调用 applicationWillTerminate 。如果您单击并在后台发送应用程序，然后再次双击滑动并终止应用程序，则每次都可能无法调用 applicationWillTerminate 。

- (void)applicationWillTerminate:(UIApplication *)application
{
        UILocalNotification *notification = [[UILocalNotification alloc] init];
        notification.userInfo =  [NSDictionary dictionaryWithObject:@"killed.app" forKey:@"Killed"];
        notification.fireDate = [NSDate dateWithTimeIntervalSinceNow:2]; // Give some time for firing the notification at least 2 seconds.
        notification.alertBody = @"App is killed.";
        notification.soundName = UILocalNotificationDefaultSoundName;
        notification.timeZone = [NSTimeZone systemTimeZone];
        [[UIApplication sharedApplication] scheduleLocalNotification:notification];
        sleep(1); // I noticed that adding sleep is required as it makes sure the notification is set before the app exits.
}

Answer 5

我可以使用以下代码在appWillTerminate中安排本地通知：

    let localNotification = UILocalNotification.init()
    localNotification.fireDate = Date.init(timeIntervalSince1970: Date().timeIntervalSince1970 + 1.5)
    localNotification.timeZone = TimeZone.current
    localNotification.repeatInterval = NSCalendar.Unit(rawValue: 0)
    localNotification.alertBody = "Did terminate app"
    localNotification.soundName = "sonar"
    UIApplication.shared.scheduleLocalNotification(localNotification)
    // block main thread
    DispatchQueue.global().async {
        sleep(1)
        DispatchQueue.main.sync {
            CFRunLoopStop(CFRunLoopGetCurrent())
        }
    }
    CFRunLoopRun()

申请终止的本地通知

5 个答案: