显著改变位置委托方法不会被调用

问题描述：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 
    self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]]; 

    _locationMgr = [[CLLocationManager alloc] init]; 
    [_locationMgr setDelegate:self]; 
    if([_locationMgr respondsToSelector:@selector(setAllowsBackgroundLocationUpdates:)]) 
     [_locationMgr setAllowsBackgroundLocationUpdates:YES]; 
    CLAuthorizationStatus authorizationStatus= [CLLocationManager authorizationStatus]; 

    if([launchOptions valueForKey:UIApplicationLaunchOptionsLocationKey] != nil) { 
     NSLog(@"relaunching because of significant location change - restarting SLC"); 
     [_locationMgr startMonitoringSignificantLocationChanges]; 
    } 
    else 
    { 
     if (authorizationStatus == kCLAuthorizationStatusAuthorizedAlways) { 
      NSLog(@"launching with authorization to always use location - starting SLC"); 
      [_locationMgr startMonitoringSignificantLocationChanges]; 
     } 
     else 
     { 
      NSLog(@"launching with no authorization to always use location - requesting authorization"); 
      if([_locationMgr respondsToSelector:@selector(requestAlwaysAuthorization)]) 
       [_locationMgr requestAlwaysAuthorization]; 
     } 
    } 

    if([userdefaults objectForKey:@"pfuser"] == nil) { 
     NSLog(@"in delegate signup"); 
     SignUpController *signup = [[SignUpController alloc] init]; 
     [self.window setRootViewController:signup]; 
    } 
    else { 
     ViewController *map = [[ViewController alloc] init]; 
     [self.window setRootViewController:map]; 
    } 
    [self.window makeKeyAndVisible]; 

    return YES; 
} 

- (void)startSignificantChangeUpdates 
{ 
    deviceNotFoundAlertController = [UIAlertController alertControllerWithTitle:@"START" message:@"startSignificantChangeUpdates called" preferredStyle:UIAlertControllerStyleAlert]; 

    [deviceNotFoundAlertController addAction:deviceNotFoundAlert]; 
    // Create the location manager if this object does not 
    // already have one. 
    if (nil == _locationMgr) { 
     _locationMgr = [[CLLocationManager alloc] init]; 
     _locationMgr.delegate = self; 
    } 

    [CLLocationManager significantLocationChangeMonitoringAvailable]; 
    [_locationMgr startMonitoringSignificantLocationChanges]; 
} 

-(void)locationManger:(CLLocationManager *)manager didFailWithError:(NSError *)error { 
    NSLog(@"didFailWithError: %@", error); 
    deviceNotFoundAlertController = [UIAlertController alertControllerWithTitle:@"LOCATION FAIL" message:@"didFailWithError" preferredStyle:UIAlertControllerStyleAlert]; 

    [deviceNotFoundAlertController addAction:deviceNotFoundAlert]; 
} 

// Delegate method from the CLLocationManagerDelegate protocol. 
- (void)_locationManager:(CLLocationManager *)manager 
     didUpdateLocations:(NSArray *)locations { 
    deviceNotFoundAlertController = [UIAlertController alertControllerWithTitle:@"LOCATION UPDATE" message:@"didUpdateLocations called" preferredStyle:UIAlertControllerStyleAlert]; 

    [deviceNotFoundAlertController addAction:deviceNotFoundAlert]; 
    // If it's a relatively recent event, turn off updates to save power. 
    CLLocation* location = [locations lastObject]; 
    NSDate* eventDate = location.timestamp; 
    NSTimeInterval howRecent = [eventDate timeIntervalSinceNow]; 
    if (fabs(howRecent) < 15.0) { 
     // If the event is recent, do something with it. 
     NSLog(@"latitude %+.6f, longitude %+.6f\n", 
       location.coordinate.latitude, 
       location.coordinate.longitude); 
    } 
}

警报都没有发生，似乎没有被称为委托方法。

UPDATE

现在我有：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 
    self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]]; 

    deviceNotFoundAlert = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil]; 

    ... 

} 

// Delegate method from the CLLocationManagerDelegate protocol. 
- (void)locationManager:(CLLocationManager *)manager 
     didUpdateLocations:(NSArray *)locations { 
    deviceNotFoundAlertController = [UIAlertController alertControllerWithTitle:@"LOCATION UPDATE" message:@"didUpdateLocations called" preferredStyle:UIAlertControllerStyleAlert]; 

    [deviceNotFoundAlertController addAction:deviceNotFoundAlert]; 
    // If it's a relatively recent event, turn off updates to save power. 
    CLLocation* location = [locations lastObject]; 
    NSDate* eventDate = location.timestamp; 
    NSTimeInterval howRecent = [eventDate timeIntervalSinceNow]; 
    if (fabs(howRecent) < 15.0) { 
     // If the event is recent, do something with it. 
     NSLog(@"latitude %+.6f, longitude %+.6f\n", 
       location.coordinate.latitude, 
       location.coordinate.longitude); 
    } 
}

当我测试的应用程序，我打开它在我的房子，然后将其关闭，这样，当我离开我的房子应该送（或3），但我没有收到来自任何委托方法（我放置警报的位置）的警报。

我刚刚有一个想法，也许我必须显示从主UIViewController，而不是AppDelegate警报？

这可能就是为什么我没有看到警报：How do I add a UIAlertController in app delegate (obj-c)

UPDATE

这就是我正在做的警报现在：

deviceNotFoundAlertController = [UIAlertController alertControllerWithTitle:@"START" message:@"startSignificantChangeUpdates called" preferredStyle:UIAlertControllerStyleAlert]; 

[deviceNotFoundAlertController addAction:deviceNotFoundAlert]; 

alertWindow = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds]; 
alertWindow.rootViewController = [[UIViewController alloc] init]; 
alertWindow.windowLevel = UIWindowLevelAlert + 1; 
[alertWindow makeKeyAndVisible]; 
[alertWindow.rootViewController presentViewController:deviceNotFoundAlertController animated:YES completion:nil];

UPDATE

警报似乎不是问题，麦芽酒rt startSignificantChangeUpdates从未出现。一旦我离开我的初始位置500米后，它会出现吗？

UPDATE

谁能帮助我理解？

您的委托对象的方法是从您启动相应位置服务的线程中调用的。该线程本身必须有一个活动的运行循环，就像在应用程序的主线程中找到的一样。

UPDATE

我想我想通了什么，以上报价是说......我有现在这样 - 我明天将测试。

... 

if([launchOptions valueForKey:UIApplicationLaunchOptionsLocationKey] != nil) { 
     NSLog(@"relaunching because of significant location change - restarting SLC"); 
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 
      [_locationMgr startMonitoringSignificantLocationChanges]; 
     }); 
    } 
    else 
    { 
     if (authorizationStatus == kCLAuthorizationStatusAuthorizedAlways) { 
      NSLog(@"launching with authorization to always use location - starting SLC"); 
      dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 
       [_locationMgr startMonitoringSignificantLocationChanges]; 
      }); 
     } 
     else 
     { 
      NSLog(@"launching with no authorization to always use location - requesting authorization"); 
      if([_locationMgr respondsToSelector:@selector(requestAlwaysAuthorization)]) 
       [_locationMgr requestAlwaysAuthorization]; 
     } 
    } 

...

我认为代码是在自己的线程上启动位置服务。我注意到的一件事是，当我退出应用程序时，右上角的位置消失。我刚刚更新到了iOS 10.在iOS 9中，右上角的位置箭头将停留在那里，但当应用程序未运行时，它只会是黑色轮廓。这可能只是他们在iOS 10中改变的东西，或者现在因为我已更新到10，现在还没有其他工作。或者当位置服务在自己的线程上运行时会发生什么情况。从这里：iOS start Background Thread

UPDATE

也许我没有正确地使用线程，但正如我所说的，现在当我关闭应用程序，位置服务退出。当我在没有线程的情况下执行时，位置服务箭头将保留在右上角，作为大纲。

UPDATE

，我读了服务应该在主线程启动 - 所以我现在：

CLAuthorizationStatus authorizationStatus= [CLLocationManager authorizationStatus]; 

    NSLog(@"launching with no authorization to always use location - requesting authorization"); 
    if([_locationMgr respondsToSelector:@selector(requestAlwaysAuthorization)]) { 
     [_locationMgr requestAlwaysAuthorization]; 
    } 

    if([launchOptions valueForKey:UIApplicationLaunchOptionsLocationKey] != nil) { 
     NSLog(@"relaunching because of significant location change - restarting SLC"); 
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 
      [_locationMgr startMonitoringSignificantLocationChanges]; 
     }); 
    } 
    else if (authorizationStatus == kCLAuthorizationStatusAuthorizedAlways) { 
     NSLog(@"launching with authorization to always use location - starting SLC"); 
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 
      [_locationMgr startMonitoringSignificantLocationChanges]; 
     }); 
    } 
    else { 
     // 
    }

中不显示时，应用程序是右侧的箭头关闭，这是iOS 10的新功能，它们不再显示它吗？

UPDATE

我不小心删除：_locationMgr = [[CLLocationManager alloc] init];我把现在的箭头是永远存在的，今天要测试。

UPDATE

我测试了，仍然没有警报。

您是否配置了使用位置服务的plist？如果没有，那么你需要做到这一点。有两个选项requestAlwaysAuthorization和requestWhenInUseAuthorization。让我知道如果这可以解决您的问题 – Janmenjaya

嗨，是的，我有 - 当我输入它时，更改为“隐私 - 位置总是使用说明”，然后我在另一列中输入消息...现在实际上有些不同了...我想我需要再次测试生病让你知道 – ewizard

我也有'需要的背景模式'与'Item0'和'应用程序寄存器的位置更新' – ewizard

答

我把我的电脑我在我的车，并观看了控制台，我看到显著位置的变化正在发生，因为我得到的位置更新每隔500米。警报是唯一不起作用的，但与程序无关 - 他们只是在那里看看它是否工作。它正在使用此代码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 
    self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]]; 

    ... 

    _locationMgr = [[CLLocationManager alloc] init]; 
    [_locationMgr setDelegate:self]; 

    if([_locationMgr respondsToSelector:@selector(setAllowsBackgroundLocationUpdates:)]) 
     [_locationMgr setAllowsBackgroundLocationUpdates:YES]; 

    CLAuthorizationStatus authorizationStatus= [CLLocationManager authorizationStatus]; 

    NSLog(@"launching with no authorization to always use location - requesting authorization"); 
    if([_locationMgr respondsToSelector:@selector(requestAlwaysAuthorization)]) { 
     [_locationMgr requestAlwaysAuthorization]; 
    } 

    if([launchOptions valueForKey:UIApplicationLaunchOptionsLocationKey] != nil) { 
     NSLog(@"relaunching because of significant location change - restarting SLC"); 
     [_locationMgr startMonitoringSignificantLocationChanges]; 
    } 
    else if (authorizationStatus == kCLAuthorizationStatusAuthorizedAlways) { 
     NSLog(@"launching with authorization to always use location - starting SLC"); 
     [_locationMgr startMonitoringSignificantLocationChanges]; 
    } 
    else { 
     // 
    } 

    ... 

    [self.window makeKeyAndVisible]; 

    return YES; 
} 

- (void)startSignificantChangeUpdates 
{ 
    // Create the location manager if this object does not 
    // already have one. 
    if (nil == _locationMgr) { 
     _locationMgr = [[CLLocationManager alloc] init]; 
     _locationMgr.delegate = self; 
    } 

    [CLLocationManager significantLocationChangeMonitoringAvailable]; 

    [_locationMgr startMonitoringSignificantLocationChanges]; 

    deviceNotFoundAlertController = [UIAlertController alertControllerWithTitle:@"START" message:@"startSignificantChangeUpdates called" preferredStyle:UIAlertControllerStyleAlert]; 

} 

-(void)locationManger:(CLLocationManager *)manager didFailWithError:(NSError *)error { 
    NSLog(@"didFailWithError: %@", error); 
} 

// Delegate method from the CLLocationManagerDelegate protocol. 
- (void)locationManager:(CLLocationManager *)manager 
     didUpdateLocations:(NSArray *)locations { 

    // If it's a relatively recent event, turn off updates to save power. 
    CLLocation* location = [locations lastObject]; 
    NSDate* eventDate = location.timestamp; 
    NSTimeInterval howRecent = [eventDate timeIntervalSinceNow]; 
    if (fabs(howRecent) < 15.0) { 
     // If the event is recent, do something with it. 
     NSLog(@"latitude %+.6f, longitude %+.6f\n", 
       location.coordinate.latitude, 
       location.coordinate.longitude); 
    } 
}

答

它与您的委托方法有问题请及时与

- (void)locationManager:(CLLocationManager *)manager 
     didUpdateLocations:(NSArray *)locations { 
}

希望它会帮助你更换一个下面

- (void)_locationManager:(CLLocationManager *)manager 
     didUpdateLocations:(NSArray *)locations { 
}

。

awesome catch ....都是因为find + replace。 ..我会尽快尝试，谢谢 – ewizard

我做了改变 - 但我仍然没有得到任何警报。另外，我不应该从'startSignificantChangeUpdates'得到警报吗？ – ewizard

我可能已经得到它的工作，我需要再次测试......一个主要问题是，我从来没有实例化'deviceNotFoundAlert' – ewizard

答

You have written write code, Just add below delegate method in your code. But startMonitoringSignificantLocationChanges for updating location take 10 to 20 min. and also trigger if location channel change. 

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations 
{ 

}

答

[_locationMgr startMonitoringSignificantLocationChanges];

重大更改位置服务仅在设备的位置发生重大变化（例如500米或更高）时才会提供更新。

因此，当您的设备移动超过500米时，您的委托方法会每次调用一次。

确保您的应用具有后台位置权限。

如果您的应用程序在后台或前台，那么它将调用委托方法否则应用程序将在AppDelegate文件中启动位置选项，您必须创建位置管理器对象并再次启动位置以获取新位置。

https://developer.apple.com/library/content/documentation/UserExperience/Conceptual/LocationAwarenessPG/CoreLocation/CoreLocation.html

我有背景权限，它不能在500m +后工作 - 我的代码看起来是否正确？ – ewizard

在位置委托方法中调用本地通知，确保新的委托方法。并移动约2公里。它说500+米不叫精确500米，有时需要更多的距离取决于网络服务。所以你可以识别。它的工作我测试了它 –

显著改变位置委托方法不会被调用

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