ios7 sdk中的MKMapView内存问题

Question

i have MKMapView in a view controller and when i starts zooming on it consume a lot of memory and when i leave the view who contains the MKMapView the memory is not released (I am using ARC in my App)

Edit :

i read in some stack overflow answers that i have to put the MKMapView in AppDelegate :

-(MKMapView*) mapView
{
    if(_mapView == nil) {
        _mapView = [[MKMapView alloc] init];
    }
    return _mapView;
}

and in viewWillDisappear of viewController that contains the MKMapView put

-(void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];

    XAppDelegate.mapView.delegate = nil;
    [XAppDelegate.mapView removeFromSuperview];

}

but it did not resolve my problem.

Answer 1

A common flaw I've seen is that the MKOverlay is holding a strong reference to the MKOverlayView / MKOverlayRender and the MKMapView . This causes a retain cycle because the MKMapView holds a strong reference to the MKOverlay instances as well.