ios中平移手势的跳动问题

要把Translation置零

pan手势方法中的代码改为

  CGPoint translation = [pan translationInView:_imageView];

   _imageView.center = CGPointMake(_imageView.center.x + translation.x,  _imageView.center.y + translation.y);
   [pan setTranslation:CGPointZero inView:_imageView];