5

我的要求是，如果我的应用程序从后台模式终止，之后如果发生任何重大的位置更改，它应该以后台模式启动。这正是startMonitoringSignificantLocationChanges

如果您启动此服务并且您的应用程序随后终止，则系统会在新事件到达时自动将应用程序重新启动到后台。在这种情况下，传递给 application:didFinishLaunchingWithOptions: 应用程序委托方法的选项字典包含键 UIApplicationLaunchOptionsLocationKey 以指示您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此方法以继续接收位置事件。当您重新启动位置服务时，当前事件会立即传递给您的委托。此外，即使在您启动位置服务之前，您的位置管理器对象的位置属性也会填充最新的位置对象。

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.");
    }
}

在那之后，它也没有在后台模式下重新启动，尽管我在到处漫游后试图改变我的位置。

我在这里遗漏或误导了什么？该应用程序没有在后台重新启动

有什么建议么？

编辑 2013 年 7 月 12 日

经过这么多试验，我发现应用程序在后台重新启动后立即崩溃并显示崩溃日志

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

从谷歌搜索我发现它是因为我正在将更新位置发送到已发布的对象。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.");
    }

这是我要走的正确方式吗？还是崩溃日志指示其他内容？

4

2 回答 2

0

现在，您的应用的位置行为取决于您viewController是否可用。您已经组合了 MVC 的“V”和“C”部分。我会考虑CLLocationManager从您的视图控制器中拉出并将其设置为您的 AppDelegate 上的属性。这样你就不必实例化一个视图控制器来响应位置变化，它建立了一个模式来访问你应用程序中其他地方的位置。首先配置您的locationMananger，然后将其传递到您的viewController.

于 2013-07-23T01:05:26.610 回答
0

应用委托

(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];



}

视图控制器.m

locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.pausesLocationUpdatesAutomatically = NO;
locationManager.distanceFilter = 300;
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
[locationManager startUpdatingLocation];
于 2014-05-13T11:12:24.560 回答