Collapsing animation customisation feature

[mrfonda]

Hello! I'm trying to add some additional alpha animation to collapsing annotationViews animation, but it seems CKClusterManagerDelegate doesn't provide proper methods to do this. By using 'clusterManager performAnimations' delegate method I can only manipulate animation code blocks but not the annotations that are going to animate.
I found a workaround for expanding animation simply by animate alpha separately in mapView(_ mapView: MKMapView, didAdd views: [MKAnnotationView]) :
func mapView(_ mapView: MKMapView, didAdd views: [MKAnnotationView]) { views.forEach { (annotation) in annotation.alpha = 0.01 UIView.animate(withDuration: 0.5, animations: { annotation.alpha = 1.0 }) } }
But I can't found a workaround for fade out animation on collapsing.
I need this because I have different shapes of annotationViews and the collapse animation because of that, looks a little bit weird.
Please, add the ability to customise animations.

Would love to see this as well.
Specifically alpha or scale animations in place of expand/contract coordinate locations.

[aramsargsyan]

@mrfonda @l2comdev See #80