ios – UIPanGestureRecognizer与UIPinchGestureRecognizer的超级视图冲突

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;
}