iOS8 UILocalNotification无效

Question

我正在使用以下代码进行本地通知。但它不起作用。位置已成功更新，并且已进入这些方法但未通知通知。有什么想法？：

注意：当应用程序处于后台但当应用程序关闭时无法正常工作。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)]){
        [application registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound categories:nil]];
    }
    [[UIApplication sharedApplication] cancelAllLocalNotifications];
    // Override point for customization after application launch.
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;

    return YES;
}

-(void) locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region {
    if ([region isKindOfClass:[CLBeaconRegion class]]) {
        UILocalNotification *notification = [[UILocalNotification alloc] init];
        notification.alertBody = @"You are checked in";
        notification.soundName = @"Default";
        [[UIApplication sharedApplication] presentLocalNotificationNow:notification];
    }
}

Answer 1

您应该记住，只有当您的应用在后台而非前台时才会显示通知。如果你在AppDelegate的前台实现- application:didReceiveLocalNotification:并自己手动处理通知。

<强> UPD

如果您的应用即使在后台运行，您的代码也不会被执行。查找Background modes（跟踪用户的位置部分）以获取可能的解决方案，以便通过事件要求系统启动您的应用，即使它当前不在内存中

Answer 2

我的情况是通知被禁用了 Settings -> Notifications -> YOUR_APP -> Allow Notifications

Answer 3

文应用已关闭applicationDidEnterBackground被调用所以把这个后台任务代码。并对本地通知进行分类。

- (void)applicationDidEnterBackground:(UIApplication *)application 
{
       bgTask = [application beginBackgroundTaskWithName:@"MyTask" expirationHandler:^{
    // Clean up any unfinished task business by marking where you
    // stopped or ending the task outright.
    [application endBackgroundTask:bgTask];
    bgTask = UIBackgroundTaskInvalid;
}];

// Start the long-running task and return immediately.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

    // Do the work associated with the task, preferably in chunks.

    [application endBackgroundTask:bgTask];
    bgTask = UIBackgroundTaskInvalid;
});
    ////  just u call the method want ever u want example

    [self notification];
}

- (void)notification
{ 
    UILocalNotification *notification = [[UILocalNotification alloc] init];
    notification.alertBody = @"You are checked in";
    notification.soundName = @"Default";
    [[UIApplication sharedApplication] presentLocalNotificationNow:notification];
}

我认为这对你有帮助。

Answer 4

即使您的应用程序已从后台删除，本地通知也会有效。但在您的情况下，您正在侦听位置管理器事件并在委托方法中触发本地通知。杀死应用程序后，您的位置管理器事件不会被触发。因此，您的本地通知根本不会被触发。

Answer 5

当您的应用程序被杀死时，信标监控仍会重新启动它 - 这对于信标监控来说是件好事！

您需要做的就是使用application:didFinishLaunchingWithOptions:方法重新启动监控。如果您这样做，导致应用程序启动的didEnterRegion事件将立即传递给代理人，该代理人应该触发通知。

Estimote有更详细的指南： Launching notifications in iOS when the app is killed。它使用来自Estimote SDK的ESTBeaconManager，ESTBeaconManagerDelegate和ESTBeaconRegion类，但您可以使用常规Core Location类替换它们以获得相同的效果。