自定义图钉动画 - MKMapView

Question

我在应用程序中使用了pin图像而不是标准引脚，现在我想给自定义引脚提供动画（与标准引脚一样的效果）。 如何为自定义图钉图像提供下降动画效果????

Answer 1

实现以下委托方法。

- (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];

   }
}

Answer 2

如果你不是立刻放下所有的针脚，而是稍微放下它们，那么它的感觉也会变得很凉爽，这样就会看起来有针雨效果。 与Apple原生的相似。 用这个：

- (void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views { 
    MKAnnotationView *aV; 

    float delay = 0.00;

    for (aV in views) {
        CGRect endFrame = aV.frame;

        aV.frame = CGRectMake(aV.frame.origin.x, aV.frame.origin.y - 430.0, aV.frame.size.width, aV.frame.size.height);
        delay = delay + 0.01;

        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDelay:delay];
        [UIView setAnimationDuration:0.45];
        [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
        [aV setFrame:endFrame];
        [UIView commitAnimations];
    }
}

Answer 3

这对我很有用。 不记得我在这里发现它的地方

- (void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views {
MKAnnotationView *aV; 

for (aV in views) {

    // Don't pin drop if annotation is user location
    if ([aV.annotation isKindOfClass:[MKUserLocation class]]) {
        continue;
    }

    // Check if current annotation is inside visible map rect, else go to next one
    MKMapPoint point =  MKMapPointForCoordinate(aV.annotation.coordinate);
    if (!MKMapRectContainsPoint(self.mapView.visibleMapRect, point)) {
        continue;
    }

    CGRect endFrame = aV.frame;

    // Move annotation out of view
    aV.frame = CGRectMake(aV.frame.origin.x, aV.frame.origin.y - self.view.frame.size.height, aV.frame.size.width, aV.frame.size.height);

    // Animate drop
    [UIView animateWithDuration:0.3 delay:0.03*[views indexOfObject:aV] options:UIViewAnimationCurveLinear animations:^{

        aV.frame = endFrame;

        // Animate squash
    }completion:^(BOOL finished){
        if (finished) {
            [UIView animateWithDuration:0.05 animations:^{
                aV.transform = CGAffineTransformMakeScale(1.0, 0.8);

            }completion:^(BOOL finished){
                if (finished) {
                    [UIView animateWithDuration:0.5 animations:^{
                        aV.transform = CGAffineTransformIdentity;
                    }];
                }
            }];
        }
    }];
    }
}

Answer 4

请注意，在-mapView:didAddAnnotationViews:中动画注释视图会在MKMapView.userTrackingMode等于MKUserTrackingModeFollowWithHeading时导致奇怪的效果。 我只是希望Apple为MKAnnotationView类提供了drop动画。

Answer 5

Swift 3 drop动画

// animate annotation views drop
func mapView(_ mapView: MKMapView, didAdd views: [MKAnnotationView]) {
        for annView in views {

            // animate any annotation views except the user pin
            if !(annView.annotation?.isKind(of: MKUserLocation.self))! {
                let endFrame = annView.frame
                annView.frame = endFrame.offsetBy(dx: 0, dy: -500)
                UIView.animate(withDuration: 0.5, animations: {
                    annView.frame = endFrame
                })
            }
        }