相关疑难解决方法(0)

这是关于使用MKMapKit的iPhone App:

我为可拖动的注释创建了一个自定义MKAnnotationView.我想创建一个自定义动画.我设置了一个自定义图钉图像,注释是可拖动的(这里没有显示,它发生在mapview中),代码如下:

- (void) movePinUpFinished {

     [super setDragState:MKAnnotationViewDragStateDragging];
     [self setDragState:MKAnnotationViewDragStateDragging];
}

- (void) setDragState:(MKAnnotationViewDragState) myState {
     if (myState == MKAnnotationViewDragStateStarting) {
          NSLog(@"starting");
          CGPoint endPoint = CGPointMake(self.center.x,self.center.y-20);
          self.center = endPoint;
          [self movePinUpFinished];
     }
     if (myState == MKAnnotationViewDragStateEnding) {
          NSLog(@"ending");
          [super setDragState:MKAnnotationViewDragStateEnding];
          [self setDragState:MKAnnotationViewDragStateNone];
          [super setDragState:MKAnnotationViewDragStateNone];
     }
     if (myState == MKAnnotationViewDragStateDragging) {
          NSLog(@"dragging");
     }
     if (myState == MKAnnotationViewDragStateCanceling) {
          NSLog(@"cancel");
     }
     if (myState == MKAnnotationViewDragStateNone) {
          NSLog(@"none");
     }
}

一切正常,注释向上移动一点,可拖动,当我发布注释时,mapview会收到"dragstateending".

但现在我希望动画在一段时间内运行并将dragStateStarting更改为以下内容:

if (myState == MKAnnotationViewDragStateStarting) {
          NSLog(@"starting");
          CGPoint endPoint = CGPointMake(self.center.x,self.center.y-20); …