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POSubclassing MKAnnotationView and overriding setDragState
 

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  1. POSubclassing MKAnnotationView and overriding setDragState
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    <p>This is about an iPhone App using MKMapKit:</p> <p>I created a custom MKAnnotationView for a draggable Annotation. I want to create a custom animation. I set a custom pin image and the annotation is draggable (which both is not shown here, it happens in the mapview) with the following code:</p> <pre><code>- (void) movePinUpFinished { [super setDragState:MKAnnotationViewDragStateDragging]; [self setDragState:MKAnnotationViewDragStateDragging]; } - (void) setDragState:(MKAnnotationViewDragState) myState { if (myState == MKAnnotationViewDragStateStarting) { NSLog(@"starting"); CGPoint endPoint = CGPointMake(self.center.x,self.center.y-20); self.center = endPoint; [self movePinUpFinished]; } if (myState == MKAnnotationViewDragStateEnding) { NSLog(@"ending"); [super setDragState:MKAnnotationViewDragStateEnding]; [self setDragState:MKAnnotationViewDragStateNone]; [super setDragState:MKAnnotationViewDragStateNone]; } if (myState == MKAnnotationViewDragStateDragging) { NSLog(@"dragging"); } if (myState == MKAnnotationViewDragStateCanceling) { NSLog(@"cancel"); } if (myState == MKAnnotationViewDragStateNone) { NSLog(@"none"); } } </code></pre> <p>Everything works fine, the annotation is moved up a bit, is draggable and when i release the annotation, the mapview receives the "dragstateending".</p> <p>But now I want the animation to run over a time period and change the dragStateStarting to the following:</p> <pre><code>if (myState == MKAnnotationViewDragStateStarting) { NSLog(@"starting"); CGPoint endPoint = CGPointMake(self.center.x,self.center.y-20); [UIView animateWithDuration:1.0 animations:^{ self.center = endPoint; } completion:^(BOOL finished){ [self movePinUpFinished]; }]; } </code></pre> <p>The animations runs as wanted over the period of a second and the annotation is draggable. But when I release the annotation, the mapview is not receiving the ending through the delegat. What I also recognized was that when I am doing the animation with "UIView animateWithDuration..." is that immedently after beginning the dragging, as the animation starts, the ballon of the annotation opens. When i am setting the new center without the animation, the balloon keeps closed and is only opened after finishing the dragging by releasing the annotation.</p> <p>What am I doing wrong? Is this the right way to override setDragState. Do I really have to call the super class? But without setting the dragstate in the superclass my mapview didnt realized the changes of the dragstate.</p> <p>I wonder about the original implementation of MKPinAnnotationView, but because it is an internal Class I couldn't find a description of the setDragState method.</p> <p>Thx for help. Cheers,</p> <p>Ben</p>
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