動畫viewForOverlay MKCircleView

Question

我想動畫我添加爲MKOverLay的圓。我希望它從屏幕的頂部掉落。如何通過委託方法進行動畫製作？還是在添加覆蓋？任何人都可以將我指向正確的方向嗎？謝謝！

我有這樣的MapView的委託方法

-(MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay 
{ 

    if([overlay isKindOfClass:[MKCircle class]]) { 
     // Create the view for the radius overlay. 
     MKCircleView *circleView = [[MKCircleView alloc] initWithOverlay:overlay]; 
     circleView.strokeColor = [UIColor whiteColor]; 
     circleView.fillColor = [[UIColor blueColor] colorWithAlphaComponent:0.2]; 

     return circleView; 
    } 

    return nil; 
} 

我補充覆蓋，像這樣：

 MKCircle *circle = [MKCircle circleWithCenterCoordinate:userCoord radius:200]; 
     [mainMapView addOverlay:circle]; 

Answer 1

比方說，你想有一個規模達+動畫褪色，你可以這樣做：

@interface MyMapOverlayView : UIView<CAAction> 
@end 

@implementation MyMapOverlayView 

- (id<CAAction>)actionForLayer:(CALayer *)layer forKey:(NSString *)event 
{ 
    if ([ event isEqualToString:@"onOrderIn" ]) 
    { 
     return self ; 
    } 

    return [ super actionForLayer:layer forKey:event ] ; 
} 

- (void)runActionForKey:(NSString *)event object:(id)anObject arguments:(NSDictionary *)dict 
{ 
    if ([ event isEqualToString:@"onOrderIn" ]) 
    { 
     { 
      CABasicAnimation * anim = [ CABasicAnimation animationWithKeyPath:@"transform" ] ; 
      anim.fromValue = [ NSValue valueWithCATransform3D:CATransform3DMakeScale(0.1f, 0.1f, 1.0f) ] ; 
      [ self.layer addAnimation:anim forKey:nil ] ; 
     } 

     { 
      CABasicAnimation * anim = [ CABasicAnimation animationWithKeyPath:@"opacity" ] ; 
      anim.fromValue = @0.0f ; 
      [ self.layer addAnimation:anim forKey:nil ] ; 
     } 
    } 
} 

@end 

注：我參加了一個猜測你怎麼可能在一次添加這些動畫您的疊加層將添加到地圖視圖，但我沒有對其進行測試。你需要做實驗。您可能可以在創建視圖時對其進行設置。

更新：我測試了它，它似乎工作。

Answer 2

下面是一些未經測試的代碼。如果確實有效，您可能需要更改動畫。

- (void)mapView:(MKMapView *)mapView didAddOverlayViews:(NSArray *)overlayViews 
{ 
    for (MKOverlayView *view in overlayViews) { 

     CGRect endFrame = view.frame; 
     view.frame = CGRectMake(endFrame.origin.x, endFrame.origin.y-500, 0, 0); 

     [UIView animateWithDuration:1.0 animations:^{ 
      view.frame = endFrame; 
     }]; 
    } 
}