iOS MKMapView - Animate map Pins

问题:

MKAnnotationView animation in iOS using Swift 4

Add animation to pins for adding pins to map smoothly. While adding pins to map, it is not smooth or it has no animation effect. Is there any simple solution to achieve this?

回答1:

I tried it with the simple code

I have created a simple code to fix this issue in swift 4.

Here is my code,

Override your viewForAnnotaion method something like this

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {

    var annotationView = self.mapView.dequeueReusableAnnotationView(withIdentifier: "Pin")

    if annotationView == nil{
        annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "Pin")
    }else{
        annotationView?.annotation = annotation
    }

    annotationView?.canShowCallout = false

    guard !annotation.isKind(of: MKUserLocation.self) else {
        //for the custom image on current location
            annotationView?.image = #imageLiteral(resourceName: "currentLocationPin")
            return annotationView
    }

 annotationView.image = UIImage(named: "pinGreen")

    let scaleTransform = CGAffineTransform(scaleX: 0.0, y: 0.0)  // Scale
    UIView.animate(withDuration: 0.2, animations: {
        annotationView?.transform = scaleTransform
        annotationView?.layoutIfNeeded()
    }) { (isCompleted) in

        // Nested block of animation
        UIView.animate(withDuration: 0.3, animations: {
            annotationView?.alpha = 1.0
            annotationView?.transform = CGAffineTransform(scaleX: 1.0, y: 1.0)
            AnimationUtility.viewSlideInFromBottom(toTop: annotationView!)
            annotationView?.layoutIfNeeded()
        })
    }

    return annotationView
}

For AnimationUtility class refer this link

https://stackoverflow.com/a/49398148/8334818

This code adds pins to map with smooth animation.