iphone - 是否可以在 MKAnnotationView 而不是 MKPinAnnotationView 中调用 animatesDrop？

Question

你知道 MKPinAnnotationView 有一个方法“animatesDrop”，可以用阴影从顶部到地图上的点对 pin 注释进行动画处理？好的，是否可以使用自定义图像执行此操作？

Answer 1

您始终可以在 MKMapViewDelegate 方法中进行自定义动画。

- (void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views

可能是这样的（你不会得到花哨的阴影动画，如果你想要它，你需要自己做）：

- (void) mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views {
    CGRect visibleRect = [mapView annotationVisibleRect]; 
    for (MKAnnotationView *view in views) {
       CGRect endFrame = view.frame;

       CGRect startFrame = endFrame; startFrame.origin.y = visibleRect.origin.y - startFrame.size.height;
       view.frame = startFrame;

       [UIView beginAnimations:@"drop" context:NULL]; 
       [UIView setAnimationDuration:1];

       view.frame = endFrame;

       [UIView commitAnimations];
    }
}

斯威夫特版本

func mapView(mapView: MKMapView, didAddAnnotationViews views: [MKAnnotationView]) {
    let visibleRect = mapView.annotationVisibleRect

    for view:MKAnnotationView in views{
        let endFrame:CGRect = view.frame
        var startFrame:CGRect = endFrame
        startFrame.origin.y = visibleRect.origin.y - startFrame.size.height
        view.frame = startFrame;

        UIView.beginAnimations("drop", context: nil)
        UIView.setAnimationDuration(1)

        view.frame = endFrame;

        UIView.commitAnimations()
    }
}

Answer 2

与@gcamp相同的答案仅适用于那些感兴趣的人

func mapView(mapView: MKMapView, didAddAnnotationViews views: [MKAnnotationView]) {
    let visibleRect = mapView.annotationVisibleRect

    for view:MKAnnotationView in views{
        let endFrame:CGRect = view.frame
        var startFrame:CGRect = endFrame
        startFrame.origin.y = visibleRect.origin.y - startFrame.size.height
        view.frame = startFrame;

        UIView.beginAnimations("drop", context: nil)
        UIView.setAnimationDuration(1)

        view.frame = endFrame;

        UIView.commitAnimations()
    }
}

Answer 3

感谢@gcamp 的回答，它工作正常，但我对其进行了一些修改，以准确地确定视图将在 mapView 上放置的位置，请检查以下代码：

- (void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views
{
CGRect visibleRect = [mapView annotationVisibleRect];
for (MKAnnotationView *view in views)
 {
    CGRect endFrame = view.frame;
    endFrame.origin.y -= 15.0f;
    endFrame.origin.x += 8.0f;
    CGRect startFrame = endFrame;
    startFrame.origin.y = visibleRect.origin.y - startFrame.size.height;
    view.frame = startFrame;

    [UIView beginAnimations:@"drop" context:NULL];
    [UIView setAnimationDuration:0.2];

    view.frame = endFrame;

    [UIView commitAnimations];
 }
}

Answer 4

为 iOS 14 更新

func mapView(_ mapView: MKMapView, didAdd views: [MKAnnotationView]) {
    let visibleRect = mapView.annotationVisibleRect
    for view: MKAnnotationView in views {
        let endFrame:CGRect = view.frame
        var startFrame:CGRect = endFrame
        startFrame.origin.y = visibleRect.origin.y - startFrame.size.height
        view.frame = startFrame
        UIView.animate(withDuration: 1.5, animations: {
            view.frame = endFrame
        }, completion: nil)
    }
}