我的应用中有来自MapView的{{1}}的组件。在MapView中，我有一个可拖动的react-native-maps@0.12.2。
问题是有时当我拖动此标记应用程序突然崩溃时出现异常。是的，有时候，这就是奇怪的事情。
MapView.Marker我真的不知道是什么导致这种情况，代码是根据官方的例子：
Terminating app due to uncaught exception 'NSRangeException', reason:'Cannot remove an observer <AIRMapManager 0x6080000096b0> for the key path "center" from <AIRMapMarker 0x7fdb4a68f4f0> because it is not registered as an observer.'
*** First throw call stack:
(
0 CoreFoundation 0x000000010c9e0b2b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000010b89b281 objc_exception_throw + 48
2 CoreFoundation 0x000000010ca49685 +[NSException raise:format:] + 197
3 Foundation 0x000000010b3b8a38 -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:] + 497
4 Foundation 0x000000010b3b87ec -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:] + 84
5 mojazastavka_ios 0x000000010aed6949 -[AIRMapManager mapView:annotationView:didChangeDragState:fromOldState:] + 1321
6 MapKit 0x000000010e66dd9a -[MKMapView _annotationViewDragStateChanged:] + 440
7 CoreFoundation 0x000000010c97fc2c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
8 CoreFoundation 0x000000010c97fb29 _CFXRegistrationPost + 425
9 CoreFoundation 0x000000010c97f892 ___CFXNotificationPost_block_invoke + 50
10 CoreFoundation 0x000000010c943132 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1826
11 CoreFoundation 0x000000010c942291 _CFXNotificationPost + 673
12 Foundation 0x000000010b367328 -[NSNotificationCenter postNotificationName:object:userInfo:] + 66
13 MapKit 0x000000010e73f916 -[MKAnnotationView setDragState:animated:] + 224
14 MapKit 0x000000010e7ebb4f -[MKAnnotationContainerView _dropDraggingAnnotationViewAnimated:] + 276
15 MapKit 0x000000010e66b928 -[MKMapView _dropDraggingAnnotationView:] + 91
16 MapKit 0x000000010e66bbac -[MKMapView handleLongPress:] + 604
17 UIKit 0x000000010f553751 -[UIGestureRecognizerTarget _sendActionWithGestureRecognizer:] + 57
18 UIKit 0x000000010f55b54f _UIGestureRecognizerSendTargetActions + 109
19 UIKit 0x000000010f558f03 _UIGestureRecognizerSendActions + 225
20 UIKit 0x000000010f5581c6 -[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:] + 981
21 UIKit 0x000000010f544728 _UIGestureEnvironmentUpdate + 1219
22 UIKit 0x000000010f544219 -[UIGestureEnvironment _deliverEvent:toGestureRecognizers:usingBlock:] + 484
23 UIKit 0x000000010f5433e0 -[UIGestureEnvironment _updateGesturesForEvent:window:] + 274
24 UIKit 0x000000010f092baa -[UIWindow sendEvent:] + 4092
25 UIKit 0x000000010f03f274 -[UIApplication sendEvent:] + 352
26 UIKit 0x000000010f81efa8 __dispatchPreprocessedEventFromEventQueue + 2932
27 UIKit 0x000000010f816f74 __handleEventQueue + 1115
28 CoreFoundation 0x000000010c986c01 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
29 CoreFoundation 0x000000010c96c0af __CFRunLoopDoSources0 + 527
30 CoreFoundation 0x000000010c96b5df __CFRunLoopRun + 911
31 CoreFoundation 0x000000010c96aff6 CFRunLoopRunSpecific + 406
32 GraphicsServices 0x0000000112905979 GSEventRunModal + 62
33 UIKit 0x000000010f021bb1 UIApplicationMain + 159
34 mojazastavka_ios 0x000000010aecd67f main + 111
35 libdyld.dylib 0x00000001109fc66d start + 1
36 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException