我有一个带有子视图的UIScrollView实例,该子视图有自己的UIPanGestureRecognizer,用于在scrollview中移动子视图.我希望scrollview的pinch-to-zoom功能优先于平移手势.然而,事实并非如此:当我用一根手指捏住我的子视图时,它会反过来平移.
到目前为止我尝试了什么:
> gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer ::它将平移和捏
> [panGestureRecognizer requireGestureRecognizerToFail:scrollView.pinchGestureRecognizer];:平移将不再起作用(仅针对UIGestureRecognizerStateEnded状态触发回调).而panGestureRecognizer.cancelstouchesInView = NO也无济于事.
我的理解是,当开始从子视图中捏合时,滚动视图和子视图都只接受一次触摸,这就是为什么在第二种情况下捏合手势识别器甚至不会失败,因为它甚至没有开始处理事件.
那么,关于如何实现这一点的任何想法?
解决方法
一种方法是允许与scrollView.pinchGestureRecognizer同时进行交互,然后在scrollView.pinchGestureRecognizer实际缩放时取消panGestureRecognizer.我知道如何取消它们的唯一方法是禁用/启用.
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{ if (gestureRecognizer == panGestureRecognizer){ if (otherGestureRecognizer == scrollView.panGestureRecognizer) { return 0; } else if(otherGestureRecognizer == scrollView.pinchGestureRecognizer){ if (scrollView.pinchGestureRecognizer.scale != 1) { gestureRecognizer.enabled = 0; gestureRecognizer.enabled = 1; } } } return 1; }