iOS UIScrollView和控制器返回手勢沖突解決方法
開發中，有部分UI，會將UIScrollView橫向鋪在底層，上面放tableView 或一些視圖左右滾動切換，底層的scrollView會和Nav ViewController原有的返回手勢沖突
解決辦法，重寫UIScrollView 的gestureRecognizerShouldBegin,在ScrollView滾動到頭的時候，屏蔽ScrollView的手勢
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 代表左滑即手指從屏幕右向左移動 反之一樣
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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