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    <p><strong>Solution 1:</strong> </p> <p>First, you need to make your view controller implement MKMapViewDelegate if it doesn't already.</p> <p>Then, implement this method:</p> <pre><code>- (void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views { MKAnnotationView *aV; for (aV in views) { CGRect endFrame = aV.frame; aV.frame = CGRectMake(aV.frame.origin.x, aV.frame.origin.y - 230.0, aV.frame.size.width, aV.frame.size.height); [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:0.45]; [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; [aV setFrame:endFrame]; [UIView commitAnimations]; } } </code></pre> <p>Add your annotations to the MapView and when they are added, this delegate method will be called and will animate the pins from top to bottom as they are added.</p> <p>The values for timing and positioning can be changed a little bit but I've tweaked it to make it look best/closest to the traditional drop (as far as I've tested).</p> <p><strong>Solution 2:</strong> </p> <p>Alternatively, if you're making a MKAnnotationView subclass, you can use didMoveToSuperview to trigger the animation. The following does a drop that ends in a slight 'squish' effect</p> <pre><code>#define kDropCompressAmount 0.1 @implementation MyAnnotationViewSubclass ... - (void)didMoveToSuperview { CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"]; animation.duration = 0.4; animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]; animation.fromValue = [NSValue valueWithCATransform3D:CATransform3DMakeTranslation(0, -400, 0)]; animation.toValue = [NSValue valueWithCATransform3D:CATransform3DIdentity]; CABasicAnimation *animation2 = [CABasicAnimation animationWithKeyPath:@"transform"]; animation2.duration = 0.10; animation2.beginTime = animation.duration; animation2.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut]; animation2.toValue = [NSValue valueWithCATransform3D:CATransform3DScale(CATransform3DMakeTranslation(0, self.layer.frame.size.height*kDropCompressAmount, 0), 1.0, 1.0-kDropCompressAmount, 1.0)]; animation2.fillMode = kCAFillModeForwards; CABasicAnimation *animation3 = [CABasicAnimation animationWithKeyPath:@"transform"]; animation3.duration = 0.15; animation3.beginTime = animation.duration+animation2.duration; animation3.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut]; animation3.toValue = [NSValue valueWithCATransform3D:CATransform3DIdentity]; animation3.fillMode = kCAFillModeForwards; CAAnimationGroup *group = [CAAnimationGroup animation]; group.animations = [NSArray arrayWithObjects:animation, animation2, animation3, nil]; group.duration = animation.duration+animation2.duration+animation3.duration; group.fillMode = kCAFillModeForwards; [self.layer addAnimation:group forKey:nil]; } </code></pre> <p>Hope this helps!</p> <p><strong>PK</strong></p>
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