将MKPolyline Overlay添加到MKMapView会导致应用程序崩溃
我的应用程序在iOS6上运行正常，但是当我向MKMapView添加叠加时，由于访问不良而在iOS 7上崩溃。我的代码如下
MKPolyline *polyline = [[MKPolyline alloc] init]; polyline = [MKPolyline polylineWithCoordinates:coordinates count:numberOfSteps]; [directionMap addOverlay:polyline]; 
这是崩溃日志（lldb）bt *
thread #51: tid = 0x1cc5, 0x38755f8c libdispatch.dylib`dispatch_retain$VARIANT$mp + 8, stop reason = EXC_BAD_ACCESS (code=1, address=0x0) frame #0: 0x38755f8c libdispatch.dylib`dispatch_retain$VARIANT$mp + 8 frame #1: 0x3598dbc8 VectorKit`-[VKRasterOverlayTileSource init] + 176 frame #2: 0x358cfd24 VectorKit`-[VKMapModel _rasterOverlayTileSourceForLevel:] + 308 frame #3: 0x358d0226 VectorKit`-[VKMapModel addRasterOverlay:] + 46 frame #4: 0x2f068dfe MapKit`-[MKOverlayContainerView _insertDrawable:forOverlay:atIndex:level:] + 1010 frame #5: 0x2f06752e MapKit`-[MKOverlayContainerView _configureAndAddDrawable:forOverlay:level:] + 326 frame #6: 0x2f0676ac MapKit`-[MKOverlayContainerView _considerAddingDrawable:inAddRect:level:] + 372 frame #7: 0x2f067cce MapKit`-[MKOverlayContainerView addOverlay:level:] + 246 frame #8: 0x001394c8 Falcon`-[GetDirectionVC showRouteFrom:to:](self=0x19742820, _cmd=0x001fa466, f=CLLocationCoordinate2D at 0x04f9ec2c, t=CLLocationCoordinate2D at 0x04f9ec1c) + 956 at GetDirectionVC.m:226 frame #9: 0x001390ee Falcon`-[GetDirectionVC loadLocations](self=0x19742820, _cmd=0x001fa458) + 1314 at GetDirectionVC.m:173 frame #10: 0x2e876e26 Foundation`__NSThread__main__ + 1062 frame #11: 0x38891c1c libsystem_pthread.dylib`_pthread_body + 140 frame #12: 0x38891b8e libsystem_pthread.dylib`_pthread_start + 102
（LLDB）
我有同样的问题，堆栈跟踪看起来对我有误导性。 我的错误修正是明确地在主线程上添加叠加层：
dispatch_async(dispatch_get_main_queue(), ^{ [mapView addOverlay:myRouteLine]; });
或者如果你想使用新的MKOverlayRenderer：
dispatch_async(dispatch_get_main_queue(), ^{ [mapView addOverlay:myRouteLine level:MKOverlayLevelAboveRoads]; });
在我的例子中，我正在异步下载一些数据，生成折线，创建MKOverlayViews / MKOverlayRenderes（没有帮助替换已弃用的代码）并将叠加层添加到地图中。
使用以下如果要在主线程以外的线程中创建多边形线：
[self performSelectorOnMainThread:@selector(addPolyLineToMap:) withObject:polyline waitUntilDone:NO]; -(void)addPolyLineToMap:(MKPolyline*)apolyline{ [mapview addOverlay:apolyline]; }