# MapView.m ...
@implementation MapView

- (id) initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {

    // [self setShowsUserLocation:YES];

    [self setDelegate:[[MapDelegate alloc] initWithMapView:self]];

# MapDelegate.m ...
- (id)initWithMapView:(MapView *)aMapView {
    self = [super init];
    self.mapView = aMapView;
    return self;
}

@property (strong) id delegateContainer;
....
[self setDelegateContainer:[[MapDelegate alloc] init]];
[self setDelegate:self.delegateContainer];