ios - interactivePopGestureRecognizer 的问题(导航 Controller 向后滑动)

Question

我的第一个问题，请温柔...

如果我使用 UIPageViewControllerTransitionStylePageCurl，但不能使用 UIPageViewControllerTransitionStyleScroll，从页面 Controller 向后滑动可以正常工作。我不明白为什么它反对后者。有任何想法吗？

过渡风格取决于演示模式:

if (inPageCurlMode) {
    // this swipes back fine
    self.pageViewController = [[UIPageViewController alloc]
    initWithTransitionStyle:
       UIPageViewControllerTransitionStylePageCurl  
    navigationOrientation:
       UIPageViewControllerNavigationOrientationHorizontal
    options:nil];
    }
else {
    // this won't swipe back
    self.pageViewController = [[UIPageViewController alloc]
    initWithTransitionStyle:
       UIPageViewControllerTransitionStyleScroll
    navigationOrientation:
       UIPageViewControllerNavigationOrientationHorizontal
    options:nil];        
    }  

Answer 1

以下在 UIPageViewController 子类中对我有用:

    override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    for subview in self.view.subviews {

        if let scrollview = subview as? UIScrollView{

            if let gestures = scrollview.gestureRecognizers{

                for gesture in gestures {
                    gesture.require(toFail: self.navigationController!.interactivePopGestureRecognizer!)
                }
            }
        }
    }
}

确保 navigationController 可用，这就是我将它放入 的原因viewDidAppear()