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

如果你不是一次性掉落所有的引脚,而是稍微放下它们,那么它的感觉也会变得很凉爽,这样看起来就像是有针雨的效果.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];
    }
}