There is an even easier solution.

Create a custom UIView (for your callout).

Then create a subclass of MKAnnotationView and override setSelected as follows:

- (void)setSelected:(BOOL)selected animated:(BOOL)animated{    [super setSelected:selected animated:animated];    if(selected)    {        //Add your custom view to self...    }    else    {        //Remove your custom view...    }}

Boom, job done.

detailCalloutAccessoryView

In the olden days this was a pain, but Apple has solved it, just check the docs on MKAnnotationView

view = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)view.canShowCallout = trueview.detailCalloutAccessoryView = UIImageView(image: UIImage(named: "zebra"))

Really, that's it. Takes any UIView.

Continuing on from @TappCandy's brilliantly simple answer, if you want to animate your bubble in the same way as the default one, I've produced this animation method:

- (void)animateIn{       float myBubbleWidth = 247;    float myBubbleHeight = 59;    calloutView.frame = CGRectMake(-myBubbleWidth*0.005+8, -myBubbleHeight*0.01-2, myBubbleWidth*0.01, myBubbleHeight*0.01);    [self addSubview:calloutView];    [UIView animateWithDuration:0.12 delay:0.0 options:UIViewAnimationOptionCurveEaseOut animations:^(void) {        calloutView.frame = CGRectMake(-myBubbleWidth*0.55+8, -myBubbleHeight*1.1-2, myBubbleWidth*1.1, myBubbleHeight*1.1);    } completion:^(BOOL finished) {        [UIView animateWithDuration:0.1 animations:^(void) {            calloutView.frame = CGRectMake(-myBubbleWidth*0.475+8, -myBubbleHeight*0.95-2, myBubbleWidth*0.95, myBubbleHeight*0.95);        } completion:^(BOOL finished) {            [UIView animateWithDuration:0.075 animations:^(void) {                calloutView.frame = CGRectMake(-round(myBubbleWidth/2-8), -myBubbleHeight-2, myBubbleWidth, myBubbleHeight);            }];        }];    }];}

It looks fairly complicated, but as long as the point of your callout bubble is designed to be centre-bottom, you should just be able to replace myBubbleWidth and myBubbleHeight with your own size for it to work. And remember to make sure your subviews have their autoResizeMask property set to 63 (i.e. "all") so that they scale correctly in the animation.

:-Joe