未调用重大更改位置委托方法

【问题标题】：significant change location delegate methods not being called未调用重大更改位置委托方法
【发布时间】：2016-09-17 16:54:50
【问题描述】：

我所有的代码都在 AppDelegate.m 中：

- (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);
    }
}

没有任何警报发生，似乎没有调用委托方法。

更新

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);
    }
}

当我测试应用程序时，我会在我家打开它，然后将其关闭，这样当我离开家时，它应该会在某个时候发送警报（或 3 个），但我没有收到来自任何人的警报委托方法（我放置警报的地方）。

我刚刚有个想法，也许我必须显示来自主要UIViewController 的警报，而不是来自AppDelegate？

这可能是我看不到警报的原因：How do I add a UIAlertController in app delegate (obj-c)

更新

这就是我现在做警报的方式：

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];

更新

警报似乎不是问题，startSignificantChangeUpdates 中的警报从未出现。它应该在我距离初始位置 500m 时出现吗？

更新

谁能帮我理解这个？

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，就像在您的应用程序的主线程中找到的那样。

更新

我想我明白上面引用的意思了......我现在知道了 - 我明天会测试。

...

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定位服务。我已经注意到的一件事是，当我退出应用程序时，右上角的位置消失了。我刚刚更新到 iOS 10。在 iOS 9 中，右上角的位置箭头会保留在那里，但当应用程序未运行时，它只会是黑色轮廓。这可能只是他们用 iOS 10 改变的东西，或者现在因为我更新到 10，其他东西现在不起作用。或者这就是位置服务在它们自己的线程上运行时发生的情况。从这里：iOS start Background Thread

更新

也许我没有正确使用线程，但正如我所说，现在当我关闭应用程序时，定位服务会退出。当我在没有线程的情况下执行此操作时，位置服务箭头将保留在右上角，作为轮廓。

更新

我读到该服务应该在主线程上启动 - 所以现在我有：

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 {
        //
    }

关闭应用后右侧的箭头不显示，这是 iOS 10 的新功能，不再显示了吗？

更新

我不小心删除了：_locationMgr = [[CLLocationManager alloc] init];我输入了，现在箭头一直在，今天去测试。

更新

我测试了它，仍然没有警报。

【问题讨论】：

  • 您是否配置为使用 plist 中的定位服务？如果没有，那么你需要这样做。有两个选项 requestAlwaysAuthorization 和 requestWhenInUseAuthorization。让我知道这是否能解决您的问题
  • 嗨，是的，我有 - 当我输入它时，它会更改为 Privacy - Location Always Usage Description，然后我在另一列中输入了一条消息......现在实际上有些不同......我想我需要再次测试生病让你知道
  • 我也有 Required background modes with`Item0` 和 App registers for location updates

标签： ios objective-c properties background delegates


【解决方案1】：

你的代理方法有问题，请替换下面的一个

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

与

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

希望对你有所帮助。

【讨论】：

  • 我进行了更改 - 但我仍然没有收到任何警报。另外，我不应该收到来自startSignificantChangeUpdates 的警报吗？
  • 我可能已经成功了，我需要再次测试...一个主要问题是我从未实例化 deviceNotFoundAlert
  • 仍然无法正常工作，没有来自任何委托方法的警报
  • 检查“didUpdateLocations”方法是否正在调用。如果调用了 get，那么您正在为“alertviewcontroller”创建对象，但是您在哪里显示警报？
  • 我也注意到了这一点，我试图在委托中显示它...我需要在视图控制器中显示它，我已经将其写入并且我即将对其进行测试...生病了更新我的问题以显示我对警报有什么...我很确定它是正确的，只是还没有能够测试
【解决方案2】：

我在车里带着我的电脑，看着控制台，我看到现在正在发生重大的位置变化，因为我每 500 米就会更新一次位置。警报是唯一不工作的东西，但它们与程序无关 - 它们只是在那里查看它是否工作。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);
    }
}

【讨论】：

    【解决方案3】： 
    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
{

}

    【讨论】：

      【解决方案4】：

      [_locationMgr startMonitoringSignificantLocationChanges];

      重大变化位置服务仅在设备位置发生重大变化（例如 500 米或更多）时才会提供更新。

      因此，当您的设备移动超过 500 米时，您的委托方法每次都会调用一次。

      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 文件中使用位置选项启动，您必须在其中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

      【讨论】：

      • 我有后台权限，在 500m+ 后它不起作用 - 我的代码看起来正确吗？
      • 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+ KM。它说 500+ 米它不称为确切的 500 米，有时需要更多的距离，具体取决于网络服务。这样你就可以识别了。它的工作我测试了它
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