Entering UIButton and other UIControl objects inside MKAnnotationView and user interaction

Question

I have my own annotation view on a map that has UIButton , but UIButton does not respond when clicked. I have two main problems with user interaction in the annotation view:

• Buttons and other controls do not respond.
• I want the annotation to block touches in accordance with my implementation - (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent*)event - that is, if I return YES, then I do not want the touches to be sent to MKMapView ( potentially choosing other annotations that BEHIND is my annotation look at), I want to handle this myself in this case.

I made sure that the userInteractionEnabled parameter userInteractionEnabled set to YES , and I examined how touches are sent to the user annotation view (my subclass of MKAnnotationView ) by overriding touchesBegan , etc., but it seems like the strokes are usually canceled (I think I managed to get touchesEnded several times) - so it seems that it will even be difficult to manually implement any interaction with the user view of the annotation.

Does anyone have an idea of ​​the possibility of more interaction with MKAnnotationView objects?

Answer 1

I managed to solve this with the help of a colleague. The solution is to override - (UIView*)hitTest:(CGPoint)point withEvent:(UIEvent*)event . Our assumption is that MKAnnotationView (which should inherit your annotation view) overrides this to do the “wrong” thing (presumably so that the choice of annotation does not overlap between overlapping annotations). Therefore, you need to redefine it for proper operation and return the corresponding UIView , then the system will send events to it, and the user will be able to interact with it :). This has a useful (in this case) side effect that an interactive annotation blocks the selection of annotations that are behind it.

Answer 2

I found that instead of overriding hitTest:withEvent: I could just override pointInside:withEvent: and just return it YES . I assume that officially I have to do the exact correction of the intersection to make sure that the place I click is inside the control, but in practice just put return YES seems to work fine, still allowing you to reject MKAnnotationView by clicking on it.

 - (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event { // for testing purposes BOOL result = [super pointInside:point withEvent:event]; NSLog(@"pointInside:RESULT = %i", result); return YES; } 

Answer 3

Adding jhabbott's answer is what worked for me. I have a custom MKCustomAnnotationView annotation MKCustomAnnotationView that contains a CustomPin annotation as an annotation. This “contact” contains UIButton as a replacement for the auxiliary button that I wanted to get by touch.

My hitTest method will look like this:

 - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event { UIView *result = [super hitTest:point withEvent:event]; //NSLog(@"ht: %f:%f %d %@", point.x, point.y, [[event touchesForView:self] count], result); if ([result isKindOfClass:[MKCustomAnnotationView class]]) { MKCustomAnnotationView *av = (MKCustomAnnotationView *)result; CustomPin *p = av.annotation; UIButton *ab = p.accessoryButton; if (p.calloutActive && point.x >= ab.frame.origin.x) return ab; } return result; } 

In most cases, a calloutActive bool is probably not required.

Answer 4

For those who want to add tapGesture to subview AnnotationView, then the answer is below:

MKannotationView with UIButton as a preview, button not responding

Worked for me:

 - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event { if (CGRectContainsPoint(_button.frame, point)) { return _button; } return [super hitTest:point withEvent:event]; }