我要求如果我的应用程序从后台模式终止，之后如果发生任何重要的位置更改，它应该以后台模式启动。这就是startMonitoringSignificantLocationChanges
如果您启动此服务，则随后会提交您的申请 终止后，系统会自动将应用程序重新启动到 新活动到来的背景。在这种情况下，选项 字典传递给应用程序：didFinishLaunchingWithOptions： 应用程序委托的方法包含密钥 UIApplicationLaunchOptionsLocationKey表示你的 应用程序是由于位置事件而启动的。重新启动后， 您仍然必须配置位置管理器对象并调用它 继续接收位置事件的方法。当你重新启动 位置服务，当前事件将传递给您的代理人 立即。此外，您所在位置的位置属性 管理器对象甚至填充了最新的位置对象 在开始定位服务之前。
所以我把这段代码
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
if ([CLLocationManager significantLocationChangeMonitoringAvailable]) {
// Stop normal location updates and start significant location change updates for battery efficiency.
[viewController.locationManager stopUpdatingLocation];
[viewController.locationManager startMonitoringSignificantLocationChanges];
//NSLog(@"significantLocationChangeMonitoringAvailable.");
}
else {
//NSLog(@"Significant location change monitoring is not available.");
}
}
之后它也没有在后台模式重新启动，虽然我试图在漫游之后改变我的位置。
我在这里缺少或误导了什么？该应用程序未在后台重新启动
有什么建议吗？
编辑2013年7月12日
经过这么多次试验后，我发现应用程序在使用崩溃日志重新启动后立即崩溃
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0:
0 libsystem_kernel.dylib 0x3ba3feb4 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3ba40048 mach_msg + 36
2 CoreFoundation 0x337ff040 __CFRunLoopServiceMachPort + 124
3 CoreFoundation 0x337fdd9e __CFRunLoopRun + 878
4 CoreFoundation 0x33770eb8 CFRunLoopRunSpecific + 352
5 CoreFoundation 0x33770d44 CFRunLoopRunInMode + 100
6 Foundation 0x34093f92 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 250
7 AppNm 0x0010a6a4 0xe4000 + 157348
8 AppNm 0x000efc2a 0xe4000 + 48170
9 AppNm 0x000e9796 0xe4000 + 22422
10 CoreLocation 0x33cd1064 -[CLLocationManager onClientEventLocation:] + 2244
11 CoreLocation 0x33cc8eaa __CLClientInvokeCallback_block_invoke_0 + 62
12 CoreFoundation 0x337ff6ae __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 10
13 CoreFoundation 0x337fed80 __CFRunLoopDoBlocks + 156
14 CoreFoundation 0x337fdca8 __CFRunLoopRun + 632
15 CoreFoundation 0x33770eb8 CFRunLoopRunSpecific + 352
16 CoreFoundation 0x33770d44 CFRunLoopRunInMode + 100
17 GraphicsServices 0x373492e6 GSEventRunModal + 70
18 UIKit 0x356862fc UIApplicationMain + 1116
19 AppNm 0x000e5854 0xe4000 + 6228
20 AppNm 0x000e57a4 0xe4000 + 6052
Thread 1 name: Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0 libsystem_kernel.dylib 0x3ba40648 kevent64 + 24
1 libdispatch.dylib 0x3b970974 _dispatch_mgr_invoke + 792
2 libdispatch.dylib 0x3b970654 _dispatch_mgr_thread$VARIANT$mp + 32
Thread 2:
0 libsystem_kernel.dylib 0x3ba50d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3b99ecf6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3b99ea12 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3b99e8a0 start_wqthread + 4
Thread 3 name: WebThread
Thread 3:
0 libsystem_kernel.dylib 0x3ba500fc __psynch_mutexwait + 24
1 libsystem_c.dylib 0x3b999124 pthread_mutex_lock + 388
2 WebCore 0x39786418 _WebTryThreadLock(bool) + 184
3 WebCore 0x3978634a WebRunLoopLock(__CFRunLoopObserver*, unsigned long, void*) + 42
4 CoreFoundation 0x337ff6ca __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 18
5 CoreFoundation 0x337fd9bc __CFRunLoopDoObservers + 272
6 CoreFoundation 0x337fdde8 __CFRunLoopRun + 952
7 CoreFoundation 0x33770eb8 CFRunLoopRunSpecific + 352
8 CoreFoundation 0x33770d44 CFRunLoopRunInMode + 100
9 WebCore 0x39784500 RunWebThread(void*) + 440
10 libsystem_c.dylib 0x3b9a930e _pthread_start + 306
11 libsystem_c.dylib 0x3b9a91d4 thread_start + 4
Thread 4 name: com.apple.NSURLConnectionLoader
Thread 4:
0 libsystem_kernel.dylib 0x3ba3feb4 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3ba40048 mach_msg + 36
2 CoreFoundation 0x337ff040 __CFRunLoopServiceMachPort + 124
3 CoreFoundation 0x337fdd9e __CFRunLoopRun + 878
4 CoreFoundation 0x33770eb8 CFRunLoopRunSpecific + 352
5 CoreFoundation 0x33770d44 CFRunLoopRunInMode + 100
6 Foundation 0x340bd3d0 +[NSURLConnection(Loader) _resourceLoadLoop:] + 304
7 Foundation 0x34140e80 __NSThread__main__ + 968
8 libsystem_c.dylib 0x3b9a930e _pthread_start + 306
9 libsystem_c.dylib 0x3b9a91d4 thread_start + 4
Thread 5 name: com.apple.CFSocket.private
Thread 5:
0 libsystem_kernel.dylib 0x3ba50594 __select + 20
1 CoreFoundation 0x338031f2 __CFSocketManager + 674
2 libsystem_c.dylib 0x3b9a930e _pthread_start + 306
3 libsystem_c.dylib 0x3b9a91d4 thread_start + 4
Thread 6:
0 libsystem_kernel.dylib 0x3ba50d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3b99ecf6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3b99ea12 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3b99e8a0 start_wqthread + 4
Thread 7:
0 libsystem_kernel.dylib 0x3ba50d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3b99ecf6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3b99ea12 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3b99e8a0 start_wqthread + 4
Thread 8:
0 libsystem_kernel.dylib 0x3ba50d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3b99ecf6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3b99ea12 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3b99e8a0 start_wqthread + 4
Thread 9:
0 libsystem_kernel.dylib 0x3ba50d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3b99ecf6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3b99ea12 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3b99e8a0 start_wqthread + 4
Thread 10:
0 libsystem_kernel.dylib 0x3ba50d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3b99ecf6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3b99ea12 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3b99e8a0 start_wqthread + 4
Unknown thread crashed with unknown flavor: 5, state_count: 1
从谷歌搜索我找到了它，因为我发送更新位置到已发布的对象。
为此，我更改了AppDelegate的代码DidFinishlaunchingWithOptions
if ([CLLocationManager significantLocationChangeMonitoringAvailable]) {
// if(!viewController.locationManager){
// viewController.locationManager = [[CLLocationManager alloc] init];
// viewController.locationManager.delegate = viewController;
// viewController.locationManager.distanceFilter = 200.0f;
// viewController.locationManager.desiredAccuracy = 200.0f;
// }
// Stop normal location updates and start significant location change updates for battery efficiency.
viewController.locationManager.delegate = nil;
[viewController.locationManager stopUpdatingLocation];
viewController.locationManager.delegate = viewController;
[viewController.locationManager startMonitoringSignificantLocationChanges];
NSLog(@"significantLocationChangeMonitoringAvailable.");
}
else {
NSLog(@"Significant location change monitoring is not available.");
}
这是我正确的方式吗？或崩溃日志表示其他内容？
答案 0 :(得分：0)
现在，您的应用的位置行为依赖于您的viewController可用。你已经结合了MVC的“V”和“C”部分。我会考虑将CLLocationManager拉出视图控制器并将其设置为AppDelegate上的属性。这样您就不必实例化视图控制器来响应位置更改，并且它建立了一种模式来访问应用程序中其他位置的位置。首先配置您的locationMananger，然后将其传递到viewController。
答案 1 :(得分：0)
的appDelegate
(void)applicationDidBecomeActive:(UIApplication *)application
{
if ([CLLocationManager significantLocationChangeMonitoringAvailable]) {
[viewController.locationManager stopMonitoringSignificantLocationChanges];
}
if ([CLLocationManager locationServicesEnabled])
{
[viewController.locationManager startUpdatingLocation];
}
}
(void)applicationDidEnterBackground:(UIApplication *)application
{
[viewController.locationManager stopUpdatingLocation];
[viewController.locationManager startMonitoringSignificantLocationChanges];
}
ViewController.m
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.pausesLocationUpdatesAutomatically = NO;
locationManager.distanceFilter = 300;
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
[locationManager startUpdatingLocation];