为什么我的CLLocationmanager委托没有被调用？

问题描述：

我没有在sim或设备上获得任何位置回调。我已经调用了这个代码：

I'm not getting any location callbacks on either sim or device. I've got this code being called:

- (void)startLocationCallbacks: (NSObject*) ignore
{
  locationManager.delegate = self;
  locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
  locationManager.distanceFilter = MINIMUM_METERS;

  [locationManager startUpdatingLocation];
  NSLog(@"[DEBUG] [locationManager startUpdatingLocation] (%@, %@)", locationManager, locationManager.delegate);
}

和两个顶部的日志语句

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error

和

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation

但两个日志语句都没有被调用。为我的应用启用了位置通知（如设置中所示，加上我说允许。）

but neither log statement ever gets called. Location Notifications are enabled for my app (as shown in Settings, plus I said "allow.")

我没有获得位置更新的可能原因是什么？

What are some possible reasons that I'm not getting location updates?

配置/其他信息：

I分配了locationManager，并将其保存在retain属性中。

我调用了startUpdatingLocation

我正在使用4.1 SDK

问题在于Sim& iPod-touch（第二代）& iPhone-3，全部运行4.1

位置通知允许在我的应用中（两者都在设置中指示，因为我在警报中点击了允许。）

之前我已成功使用过CLLocationManager（在许多运送应用程序中！）这对我来说是一个真正的拔毛器。

I have allocated locationManager, and saved it in a retain property.
I have called startUpdatingLocation
I'm using 4.1 SDK
Problem is on both Sim & iPod-touch (2nd Gen) & iPhone-3, all running 4.1
Location notifications are allowed in my app (both as indicated in Settings and because I clicked "allow" in the alert.)
I've used CLLocationManager successfully before (in many shipping apps!) This is a real hair-puller for me.

谢谢！

答

哇！好的，我找到了。

事实证明，使 CLLocationManager 的方法之一不会触发位置回调是在非主线程中进行所有设置。当我将我的设置例程移动到 performSelectorOnMainThread 时，所有操作完全符合预期。

It turns out that one of the ways to make a CLLocationManager not fire off location callbacks is to do all the set-up in not-the-main-thread. When I moved my setup routine to a performSelectorOnMainThread, all worked exactly as expected.

真是个噩梦！

希望这个答案有助于其他人...

Hope this answer helps others...

编辑/澄清：

最初，我有这样的事情：

Originally, I had something like this:

- (BOOL) appDidFinishLaunchingWithOptions: (NSDictionary*) options
{
     // ...[app setup, snip]
    [NSThread detachNewThreadSelector: @selector(postLaunchSetupThread) toTarget: self withObject: nil];
}

- (void)postLaunchSetupThread
{
    NSAutoreleasePool *pool = [NSAutoreleasePool new];
    // ...[other setup, snip]
    [self setupLocationManager];
    [pool release];
}

- (void)setupLocationManager
{
     self.myLocationManager = [[[CLLocationManager alloc] init] autorelease];
     [myLocationManager startLocationUpdates];
}

但是调用 setupLocationManager 在一个线程中阻止了回调。所以我的修复是移动线

But calling setupLocationManager in a thread prevented the callbacks. So my fix was to move the line

[self setupLocationManager];

退出线程并返回 appDidFinishLaunchingWithOptions

为什么我的CLLocationmanager委托没有被调用？

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