解决scrollView右滑与系统右滑返回上级页面手势冲突

PopGestureConflictProtocol.swift

/// 解决视图右滑与系统右滑返回上级页面手势冲突
protocol PopGestureConflictProtocol {
}

extension UIViewController: PopGestureConflictProtocol {}
extension PopGestureConflictProtocol where Self: UIViewController {

    /// 处理scrollView和系统右滑返回手势的冲突
    ///
    ///    虽然self可能是某个UIViewController的子视图，但是不用管它。直接处理navigationController的手势冲突就行了
    ///    因为我发现这么一个神奇的情况：
    ///       navigationController -[embed]-> viewController -[embed]-> subviewController
    ///       你会发现subviewController的navigationController和viewController的navigationController是同一个
    ///
    func handlePopGestureConflict(with conflictedView: UIScrollView) {
        navigationController?
            .view
            .gestureRecognizers?
            .forEach { gesture in
                guard gesture is UIScreenEdgePanGestureRecognizer else { return }
                conflictedView.panGestureRecognizer.require(toFail: gesture)
            }
    }
}