UIPageViewController didFinishAnimating如果快速滑动不调用 [英] UIPageViewController didFinishAnimating not called if swiped quickly

问题描述

我有一个工作原理的UIPageViewController。我可以左右滚动，当我滚动每个方向时，调用委托方法 didFinishAnimating 。但是，如果我滚动太快，我最终在一个页面 didFinishAnimating 不被调用，虽然它被调用所有以前的页面。有人知道为什么会发生这种情况吗？

I have a UIPageViewController that works as expected. I can scroll left and right and the delegate method didFinishAnimating is called when I scroll each direction. However, if I scroll too quickly I end up on a page where didFinishAnimating is not called, though it is called for all previous pages. Does anyone know why this might be happening?

我认为 didFinishAnimating （例如，即使轮到中止）。

I would think that didFinishAnimating would be called on every page transition regardless (e.g., even if the turn was aborted).

推荐答案

我有同样的问题。我试图使用 UIScrollView委托而不是 UIPageViewController 来解决问题。

I've got the same issue. I tried to use the UIScrollView delegate instead of UIPageViewController to solve the issue. This is a tricky method, not recommend to use.

1. UIScrollView 在 UIPageViewController 中设置委托：

1.get the UIScrollView in UIPageViewController to set delegate:

for (UIView *view in self.view.subviews) {
    if ([view isKindOfClass:[UIScrollView class]]) {
        UIScrollView *scroll = (UIScrollView *) view;
        scroll.delegate = self;
    }
}

2.override scrollViewWillBeginDragging： （UIScrollView *）scrollView

2.override scrollViewWillBeginDragging:(UIScrollView *)scrollView

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
    [[NSNotificationCenter defaultCenter] postNotificationName:PageSwitchingBegan
                                                    object:nil];
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
    [[NSNotificationCenter defaultCenter] postNotificationName:PageSwitchingEnded
                                                    object:nil];
}

您也可以尝试覆盖 - （void）scrollViewDidEndDecelerating ：（UIScrollView *）scrollView 而不是 scrollViewDidEndDragging ，以获得更好的效果。

You may also try override - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView instead of scrollViewDidEndDragging to achieve better result.

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