Question

我正在尝试在后台发布数据，我希望在常规时间间隔内收到响应，以便我尝试使用CLLocation Manager。但didUpdateToLocation方法只调用一次。请建议我！在这里输入代码

    - (void)applicationDidEnterBackgroundUIApplication *)application
    {
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move
    locationManager.desiredAccuracy = kCLLocationAccuracyBest; // 100 m
    [locationManager startUpdatingLocation];
    UIApplication* app = [UIApplication sharedApplication];

    bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
    [app 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
    // code for Posting Data Here
    NSLog(@"backgroundTimeRemaining: %f", [[UIApplication sharedApplication] backgroundTimeRemaining]);
    [app endBackgroundTask:bgTask];
    bgTask = UIBackgroundTaskInvalid;
    });

    }
    - (void)locationManagerCLLocationManager *)manager
       didUpdateToLocationCLLocation *)newLocation
       fromLocationCLLocation *)oldLocation
     {

      NSLog(@"Location Change");
     } 
     This Method Call Only Once.

Answer 1

确保您没有在模拟器中测试它。您无法在iphone模拟器上获得位置更新。

Answer 2

要在后台运行位置服务，您需要修改plist，使UIBackgroundModes键包含位置。

Answer 3

电话应该是

    [locationManager startMonitoringSignificantLocationChanges];

位置背景 - 网络连接

3 个答案: