Custom Map Annotation Callouts on iOS

custom_callouts.md

1. Create a UIView subclass for the pin callout view.

2. Create a subclass of MKAnnotationView for your map pins.

3. Add an instance of the callout view subclass to your MKAnnotationView subclass.

4. Add a property to toggle the callout view to your MKAnnotationView subclass. This example fades in/out:

   - (void)setShowCustomCallout:(BOOL)showCustomCallout
   {
       [self setShowCustomCallout:showCustomCallout animated:NO];
   }
   
   - (void)setShowCustomCallout:(BOOL)showCustomCallout animated:(BOOL)animated
   {
       if (_showCustomCallout == showCustomCallout) return;
   
       _showCustomCallout = showCustomCallout;
   
       void (^animationBlock)(void) = nil;
       void (^completionBlock)(BOOL finished) = nil;
   
       if (_showCustomCallout) {
           self.calloutView.alpha = 0.0f;
   
           animationBlock = ^{
               self.calloutView.alpha = 1.0f;
               [self addSubview:self.calloutView];
           };
   
       } else {
           animationBlock = ^{ self.calloutView.alpha = 0.0f; };
           completionBlock = ^(BOOL finished) { [self.calloutView removeFromSuperview]; };
       }
   
       if (animated) {
           [UIView animateWithDuration:0.2f animations:animationBlock completion:completionBlock];
   
       } else {
           animationBlock();
           completionBlock(YES);
       }
   }
   

5. Override hitTest:forEvent: to return the callout view if it is currently being shown and the point is within its frame.

   - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
   {
       if (self.showCustomCallout && CGRectContainsPoint(self.calloutView.frame, point)) {
           return self.calloutView;
   
       } else {
           return nil;
       }
   }
   

6. Subclass MKMapView and override hitTest:forEvent: to avoid callouts hiding when tapped:

   - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
   {
          UIView *view = [super hitTest:point withEvent:event];
   
          if ([view isKindOfClass:MyCalloutView.class]) {
              return nil; // todo: add a new delegate method to the map protocol to handle callout taps
          } else {
              return view;
          }
   }
   

7. On your mapview delegate override mapView:didSelectAnnotationView: to show your callout:

   - (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view
   {
       if ([view isKindOfClass:MyAnnotationView.class]) {
           MyAnnotationView *annotationView = (MyAnnotationView *)view;
           [annotationView setShowCustomCallout:YES animated:YES];
       }
   }
   

8. On your mapview delegate override mapView:didDeselectAnnotationView: to hide your callout:

   - (void)mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)view
   {
       if ([view isKindOfClass:[MyAnnotationView class]]) {
           [((MyAnnotationView *)view) setShowCustomCallout:NO animated:YES];
   	}
   }
   

Overriding the MKMapView:hitTest:forEvent completely prevents the map from calling "didSelectAnnotationView"...

I had implemented your code. but its not working. please help me. My code is in http://stackoverflow.com/questions/32756922/how-to-code-for-mkmapkitview-which-shows-another-container-view-when-user-click link.