UIPageViewController 转换“对开始/结束外观转换的不平衡调用”

当我浏览时UIPageViewController比我得到的过渡动画更快'Unbalanced calls to begin/end appearance transitions for <MyDataViewController>'并且直到我尝试翻页时才会显示两个横向视图之一。

有人有解决这个错误的想法吗？

上面的答案是正确的，但我认为比需要的更详细，并且食谱很有帮助。所以这似乎对我有用：

在设置并调用pageViewController的视图控制器中， 宣布：

@property (assign)              BOOL pageIsAnimating;

在 viewDidLoad 中：

    pageIsAnimating = NO;

添加这个：

- (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray *)pendingViewControllers {
    pageIsAnimating = YES;
}

并添加几行：

- (void)pageViewController:(UIPageViewController *)pageViewController
    didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers
   transitionCompleted:(BOOL)completed {
    if (completed || finished)   // Turn is either finished or aborted
        pageIsAnimating = NO;
    ...
}

通过拒绝提供视图控制器信息来抑制手势：

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController
   viewControllerAfterViewController:(UIViewController *)viewController {
    if (pageIsAnimating)
        return nil;
    ...
    return after;
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController
  viewControllerBeforeViewController:(UIViewController *)viewController {
    if (pageIsAnimating)
        return nil;
    ...
    return before;
}

哦，方向改变会重置标志：

- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController
               spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation {
    pageIsAnimating = NO;
    ...
}