UIScrollView 滑动手势与右滑返回冲突

问题: scrollView 滑动与系统右滑返回的边缘手势冲突时,返回手势失效

解决方案

思路就是: 右滑返回优先. 当触发到右滑返回手势时就取消 scrollView的手势

OC版

[self.contentScrollView.panGestureRecognizer requireGestureRecognizerToFail:self.navigationController.interactivePopGestureRecognizer];

Swift版

self.contentScrollView.panGestureRecognizer.requireGestureRecognizerToFail(navigationController!.interactivePopGestureRecognizer!)