MapKit internal calls causing crash
- by Ronnie Liew
I have a MKMapView in the view of a UIViewController. The app will crash randomly when the I pop the UIViewController off from the UINavigationController.
In the dealloc method of the UIViewController, I have already assigned the MKMapView delegate to nil as below:
- (void)dealloc {
mapView.delegate = nil;
[_mapView release];
_mapView = nil;
[super dealloc];
}
The crash log are also attached as follows:
Crash log #1:
Thread 0 Crashed:
0 libobjc.A.dylib 0x000026f6 objc_msgSend + 18
1 MapKit 0x0005676c -[MKUserLocationPositionAnimation animationDidStop:finished:] + 64
2 QuartzCore 0x00015a26 run_animation_callbacks(double, void*) + 282
3 QuartzCore 0x000158dc CA::timer_callback(__CFRunLoopTimer*, void*) + 100
4 CoreFoundation 0x00056bac CFRunLoopRunSpecific + 2112
5 CoreFoundation 0x00056356 CFRunLoopRunInMode + 42
6 GraphicsServices 0x00003b2c GSEventRunModal + 108
7 GraphicsServices 0x00003bd8 GSEventRun + 56
8 UIKit 0x00002768 -[UIApplication _run] + 384
9 UIKit 0x0000146c UIApplicationMain + 688
10 Refill 0x00002aea main (main.m:14)
11 Refill 0x00002a60 start + 44
Crash log#2
Thread 0 Crashed:
0 libobjc.A.dylib 0x000026f4 objc_msgSend + 16
1 MapKit 0x0005a20e -[MKUserLocationViewInternal userLocationViewAccuracyDidUpdate] + 42
2 MapKit 0x0005676c -[MKUserLocationPositionAnimation animationDidStop:finished:] + 64
3 QuartzCore 0x00015a26 run_animation_callbacks(double, void*) + 282
4 QuartzCore 0x000158dc CA::timer_callback(__CFRunLoopTimer*, void*) + 100
5 CoreFoundation 0x00056bac CFRunLoopRunSpecific + 2112
6 CoreFoundation 0x00056356 CFRunLoopRunInMode + 42
7 GraphicsServices 0x00003b2c GSEventRunModal + 108
8 GraphicsServices 0x00003bd8 GSEventRun + 56
9 UIKit 0x00002768 -[UIApplication _run] + 384
10 UIKit 0x0000146c UIApplicationMain + 688
11 Refill 0x00002aea main (main.m:14)
12 Refill 0x00002a60 start + 44
Seems like the MapKit is trying to update the MKMapView on the user location but the delegate has already been deallocated. What else I am missing here?
