iOS UIScrollView和控制器返回手势冲突解决方法

这篇文章主要介绍了iOS UIScrollView和控制器返回手势冲突解决方法，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧

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

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									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

									  }

									}