Question

我已经成功地组合了一个带有图钉注释的mapview，表示用户在设定的时间间隔内更新的当前位置。当位置管理器更新用户的位置时，引脚注释将消失并重新出现在新位置。有没有人玩过让当前用户的GPS位置通过使用动画更新，就像Apple的官方地图应用程序中所做的那样？如果是这样，我会喜欢一些指示，让它工作。谢谢！

Answer 1

解决方案1：

首先，您需要让视图控制器实现MKMapViewDelegate（如果尚未实现）。

然后，实现此方法：

- (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];

   }
}

将注释添加到MapView中，添加注释后，将调用此委托方法，并在添加引脚时从上到下为引脚设置动画。

定时和定位的值可以稍微改变一下，但我已经调整它以使它看起来最好/最接近传统的掉落（据我测试过）。

解决方案2：

或者，如果您正在创建MKAnnotationView子类，则可以使用didMoveToSuperview来触发动画。以下是以轻微的“挤压”效果结束的下降

#define kDropCompressAmount 0.1

  @implementation MyAnnotationViewSubclass

  ...

  - (void)didMoveToSuperview {
      CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"];
      animation.duration = 0.4;
      animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
      animation.fromValue = [NSValue valueWithCATransform3D:CATransform3DMakeTranslation(0, -400, 0)];
      animation.toValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];

      CABasicAnimation *animation2 = [CABasicAnimation animationWithKeyPath:@"transform"];
      animation2.duration = 0.10;
      animation2.beginTime = animation.duration;
      animation2.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
      animation2.toValue = [NSValue valueWithCATransform3D:CATransform3DScale(CATransform3DMakeTranslation(0, self.layer.frame.size.height*kDropCompressAmount, 0), 1.0, 1.0-kDropCompressAmount, 1.0)];
      animation2.fillMode = kCAFillModeForwards;

      CABasicAnimation *animation3 = [CABasicAnimation animationWithKeyPath:@"transform"];
      animation3.duration = 0.15;
      animation3.beginTime = animation.duration+animation2.duration;
      animation3.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
      animation3.toValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];
      animation3.fillMode = kCAFillModeForwards;

      CAAnimationGroup *group = [CAAnimationGroup animation];
      group.animations = [NSArray arrayWithObjects:animation, animation2, animation3, nil];
      group.duration = animation.duration+animation2.duration+animation3.duration;
      group.fillMode = kCAFillModeForwards;

      [self.layer addAnimation:group forKey:nil];
  }

希望这有帮助！

<强> PK

iphone sdk MapView更新用户位置

1 个答案: