开发中，有部分UI，会将UIScrollView横向铺在底层，上面放tableView 或一些视图左右滚动切换，底层的scrollView会和Nav ViewController原有的返回手势冲突

解决办法，重写UIScrollView 的gestureRecognizerShouldBegin,在ScrollView滚动到头的时候，屏蔽ScrollView的手势

class GesturesConflictScrollView: UIScrollView { override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool { back(by: gestureRecognizer) } private final func back(by gestureRecognizer: UIGestureRecognizer) -> Bool { guard gestureRecognizer == panGestureRecognizer else { return true } // point.x < 0 代表左滑即手指从屏幕右向左移动 反之一样 let point: CGPoint = panGestureRecognizer.translation(in: self) let state: UIGestureRecognizer.State = gestureRecognizer.state let locDistance: CGFloat = UIScreen.main.bounds.size.width if state == .began || state == .possible { let locationPoint = gestureRecognizer.location(in: self) if point.x > 0 && locationPoint.x < locDistance && contentOffset.x <= 0 { return false } let pageCount = contentSize.width / UIScreen.main.bounds.size.width let criticalPoint = pageCount < 2 ? locDistance : locDistance * (pageCount - 1) if point.x < 0 && contentOffset.x == criticalPoint { return false } } return true }}

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