當方向設置爲水平時，UIPageViewController響應垂直平移。

Question

我已經在這上面燒了幾個小時。我已經初始化UIPageViewController與UIPageViewControllerNavigationOrientationHorizontal，但由於某種原因，當用戶垂直平移時調用viewControllerBeforeViewController。

此外，發生這種情況時，不會翻頁，並且完全不會調用didFinishAnimating:didFinishAnimating:previousViewControllers:transitionCompleted。這意味着頁面視圖控制器知道這是一個垂直運動..

這是初始化代碼 -

- (void)initPageViewController 
{ 
    self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl 
                   navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal 
                      options:nil]; 
    self.pageViewController.delegate = self; 
    self.pageViewController.dataSource = self; 

    [self addChildViewController:self.pageViewController]; 
    [self.view addSubview:self.pageViewController.view]; 

    // Set the page view controller's bounds using an inset rect so that self's view is visible around the edges of the pages. 
    self.pageViewController.view.frame = self.view.bounds; 

    [self.pageViewController didMoveToParentViewController:self]; 

    // Leave only pan recognizers enabled, so buttons positioned inside a page would work. 
    for (UIGestureRecognizer *gr in self.pageViewController.gestureRecognizers) 
    { 
     if ([gr class] != [UIPanGestureRecognizer class]) 
      gr.enabled = NO; 
    } 
} 

任何想法？

Answer 1

我最初偶然發現了面臨同樣問題的問題 - 但我似乎已經解決了這個問題。

基本上，我所要做的就是將一個代表設置爲UIPageViewController所附的所有手勢識別器。因此，在創建UIPageViewController後不久，我所做的：

for (UIGestureRecognizer *gr in self.book.gestureRecognizers) 
    gr.delegate = self.book; 

其中book是我的自定義UIPageViewController（我已經基本上設置自己爲代表）。最後，將此方法添加到UIPageViewController以限制任何垂直平移（或使用註釋掉的線代替限制水平平移）。

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer 
{ 
    if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]) 
    { 
     UIPanGestureRecognizer *panGestureRecognizer = (UIPanGestureRecognizer *)gestureRecognizer; 
     CGPoint translation = [panGestureRecognizer translationInView:self.view]; 

     return fabs(translation.x) > fabs(translation.y); 
//  return fabs(translation.y) > fabs(translation.x); 
    } 
    else 
     return YES; 
} 

我暗示朝這個感謝this answer - 只要確保你只篩選出UIPanGestureRecognizer秒。