Question

看起来这个问题好像被问了好几次，但我面临一个奇怪的问题。

我已将服务器配置为使用content-available = 1标志发送推送通知。我已将我的应用配置为Background Modes，Location Update和Background fetch的后台Remote Notifications。此外，我已经实现了所有必要的代码，以便在后台接收推送通知并启动后台任务。

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
    __block UIBackgroundTaskIdentifier bg_task = background_task;
    background_task = [application beginBackgroundTaskWithExpirationHandler:^ {
        //Clean up code. Tell the system that we are done.
        [application endBackgroundTask: bg_task];
        bg_task = UIBackgroundTaskInvalid;
    }];
    //### background task starts
    [self updateLocationToServer];
    //#### background task ends
    completionHandler(UIBackgroundFetchResultNewData);
}

- (void)updateLocationToServer{

[locationManager updateLocationWithCompletionHandler:^(CLLocation *location, NSError *error, BOOL locationServicesDisabled) {
    if (error)
    {
        //  Handle error here
        if (locationServicesDisabled) {
            //  Location services are disabled, you can ask the user to enable them for example
        }
    }
    else
    {
        //  Do whatever you want with the current user's location
        NSString *deviceID = [userDefs objectForKey:@"deviceID"];
        isConnected = [[userDefs objectForKey:@"connected"] boolValue];
        if (isConnected) {
            if (deviceID) {
                [self sendLocation:deviceID];
            }
        }

        localNotif = [[UILocalNotification alloc] init];
        localNotif.fireDate = [NSDate dateWithTimeIntervalSinceNow:0.1];
        localNotif.timeZone = [NSTimeZone defaultTimeZone];
        localNotif.alertBody = [NSString stringWithFormat:@"Lat: %@ Long:%@",[NSNumber numberWithFloat:location.coordinate.latitude],[NSNumber numberWithFloat:location.coordinate.longitude]];

        [[UIApplication sharedApplication] scheduleLocalNotification:localNotif];

        NSLog(@"Lat: %@ Long:%@",[NSNumber numberWithFloat:location.coordinate.latitude],[NSNumber numberWithFloat:location.coordinate.longitude]);

        //Clean up code. Tell the system that we are done.
        [[UIApplication sharedApplication] endBackgroundTask: background_task];
        background_task = UIBackgroundTaskInvalid;}}];}

编辑：添加了我结束后台任务的代码。 background_task变量是全局的。
该应用程序正常接收后台推送，直到它进入暂停模式。问题是，在后台任务结束后，应用程序进入挂起模式时，它会在收到推送通知时再次运行代码，但不会调用didReceiveRemoteNotification: fetchCompletionHandler:。但是当我打开应用程序并退出主页按钮时，它会在“那个”3分钟内再次运行，直到它进入暂停模式。

在Suspended模式下接收推送后启动后台任务

0 个答案: