Databases
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    <p>As your method is never got invoked, you should do:</p> <pre><code>- (void)mapView:(MKMapView *)aMapView regionDidChangeAnimated:(BOOL)animated { [aMapView removeAnnotation:[self point]]; mkShape.coordinate = aMapView.centerCoordinate; [aMapView addAnnotation:mkShape]; } </code></pre> <p>And you should create your MKAnnotationView properly. You need create two properties in .h file first (for performance reason):</p> <pre><code>MKPointAnnotation *mkShape; MKAnnotationView *annotationView; </code></pre> <p>then use the code below to create your MKPointAnnotation</p> <pre><code>- (void)createShape { if (!mkShape) { mkShape = [[MKPointAnnotation alloc] init]; mkShape.title = nil; mkShape.subtitle = @"test description"; } } - (id &lt;MKAnnotation&gt;)point { [self createShape]; // Make sure to check if this is an MKPointAnnotation. MKOverlays also // conform to MKAnnotation, so it isn't sufficient to just check to // conformance to MKAnnotation. if ([mkShape isKindOfClass:[MKPointAnnotation class]]) return (id &lt;MKAnnotation&gt;)mkShape; return nil; } - (MKAnnotationView *)annotationView { if (!annotationView) { id &lt;MKAnnotation&gt; annotation = [self point]; if (annotation) { MKPinAnnotationView *pin = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:nil]; pin.canShowCallout = YES; pin.animatesDrop = YES; pin.draggable = NO; annotationView = pin; } } return annotationView; } - (MKAnnotationView *)mapView:(MKMapView *)aMapView viewForAnnotation:(id &lt;MKAnnotation&gt;)annotation { if ([annotation isEqual:mkShape]) { return [self annotationView]; } return nil; } </code></pre> <p>At the end, don't forget to release your properties.</p> <pre><code>- (void)dealloc { [annotationView release]; [mkShape release]; [super dealloc]; } </code></pre>
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    1. COStill no pin :(
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      1. USMelvin Lai
    2. COdose mapView:viewForAnnotation: get invoked? If you are using Simulator to test your code, try move the map by yourself, and wait to see if the method is invoked.
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    3. COBTW, have you ever set your mapView.delegate? I can't find where you set it in your code.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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