[MKMapView setShowsUserLocation] 中的 EXC_BAD_ACCESS
我在一段相对简单的代码中得到了令人讨厌的 EXC_BAD_ACCESS 。有谁知道这段代码为何崩溃？
stack:
_remove ()
-[MKQuadTrie remove:] ()
-[MKAnnotationContainerView removeAnnotation:] ()
-[MKMapView(UserPositioningInternal) removeUserLocation] ()
-[MKMapView(UserPositioning) stopUpdatingUserLocation] ()
-[MKMapView setShowsUserLocation:] ()
-[MapViewController stopTrackingLocation]
code:
- (void)stopTrackingLocation
{
if (mapView.showsUserLocation)
{
// Crashes here
mapView.showsUserLocation = NO;
}
}
I'm getting the nasty EXC_BAD_ACCESS in a relatively straightforward piece of code. Does any one have any idea why this code crashes?
stack:
_remove ()
-[MKQuadTrie remove:] ()
-[MKAnnotationContainerView removeAnnotation:] ()
-[MKMapView(UserPositioningInternal) removeUserLocation] ()
-[MKMapView(UserPositioning) stopUpdatingUserLocation] ()
-[MKMapView setShowsUserLocation:] ()
-[MapViewController stopTrackingLocation]
code:
- (void)stopTrackingLocation
{
if (mapView.showsUserLocation)
{
// Crashes here
mapView.showsUserLocation = NO;
}
}
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评论（2）
我是新手，但我只是想提供帮助。
您的应用程序是否在您刚刚启动应用程序时失败？
我认为它显示访问错误，因为获取您的位置需要时间，并且您在 GPS 获取位置数据之前访问它。
因此，为了防止这种情况，我将使用 didupdatetolocation: 方法。
将位置数据分配给“something”，
因此如果“something”不为零，则仅mapview.showsuserlocation = NO;
I'm a newbie but I'm just trying to help.
Is your application failing at the point where you just start your app?
I think it shows bad access because getting your location takes time, and you access it before your gps get the location data.
So to prevent this I will use the didupdatetolocation: method.
Assign the location data into "something"
so if "something" is not nil, then only mapview.showsuserlocation = NO;
当您尝试访问不存在的对象时，您会收到此错误。您确定在调用
- stopTrackingLocation之前没有从内存中释放mapView吗？This error you use to get when you try access non existing object. Are you sure
mapViewwas not released from memory before- stopTrackingLocationcall?