容器视图控制器中UIPageViewController的旋转

Question

我有一个包含其他ViewControllers的UIViewController。初始视图控制器设置在viewDidLoad中：

FirstViewController *first = [FirstViewController alloc] init]; 
first.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; 
first.view.frame = m_content.frame; 

[self addChildViewController:first]; 
[m_content.view addSubview:first.view]; 
[first didMoveToParentViewController:self]; 
m_activeViewController = first; 

此容器控制器已经实施automaticallyForwardAppearanceAndRotationMethodsToChildViewControllers返回YES。它还实施manualy正向旋转改变非活跃ViewControllers

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    return YES; 
} 
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration 
{ 
    for(UIViewController *vc in m_viewControllers) 
    { 
     if(vc != [m_activeViewController] 
      [vc willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration]; 
    } 
} 
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation 
{ 
    for(UIViewController *vc in m_viewControllers) 
    { 
     if(vc != [m_activeViewController] 
      [vc didRotateFromInterfaceOrientation:fromInterfaceOrientation]; 
    } 
} 

当菜单按钮被窃听我做ViewControllers之间的过渡。

- (void)onMenuItemTapped:(id)sender 
{ 
    UIViewController *vc = [m_viewControllers objectAtIndex:sender.tag]; 

    vc.view.frame = m_content.frame; 
    [self addChildViewController:vc]; 
    [self transitionFromViewController:m_activeViewController toViewController:vc duration:0 options:UIViewAnimationOptionTransitionNone animations:nil completion:^(BOOL finished) { 
    [vc didMoveToParentViewController:self]; 
    [m_activeViewController removeFromParentViewController]; 
    m_activeViewController = vc; 
    }]; 
} 

这种转变工作正常，我的“正常” ViewControllers和他们方位的变化后正常显示，即使他们不积极。但是，其中一个子视图控制器称为SecondCV，它具有UIPageViewController作为子视图控制器。我有UIPageViewControllerDelegate和UIPageViewControllerDataSource设置为此SecondCV和pageViewController：spineLocationForInterfaceOrientation：我回UIPageViewControllerSpineLocationMin的肖像和UIPageViewControllerSpineLocationMid景观。此SecondVC的旋转功能在其处于活动状态时正常工作 - 在横向上有两页，在纵向模式下正确显示了一页。但是当这个SecondVC不活跃时，旋转是不正确的。即使调用了pageViewController：spineLocationForInterfaceOrientation：，纵向和横向模式中仍然有一个页面。我试图解决这一段时间，但我没有看到任何其他选项。你有什么想法如何解决这个问题？

谢谢。

Answer 1

我已经解决了这种棘手的问题。

其实SecondVC旋转正确，或至少，脊柱位置正确更改。因此，当我旋转设备并且SecondVC在父视图中未处于活动视图控制器时，其HAS收到旋转消息并且pageViewController：spineLocationForInterfaceOrientation：也被调用。我为新的界面方向设置了正确的脊柱位置，并将其设置为SecondVC的页面视图控制器。问题是，即使我设置了两个视图控制器为UIPageViewControllerSpineLocationMid，显示SecondVC后仍然只有一个，就像在UIPageViewControllerSpineLocationMin中一样。

我有“固定”的问题，在viewWillAppear中视图控制器设置为页面视图控制器：再次，因为当这个方法被调用，用于页面视图控制器脊骨位置是正确的，并在此基础上的信息我设置一个，或两页（视图控制器）

- (void)viewWillAppear:(BOOL)animated 
{ 
if(m_pageController.spineLocation == UIPageViewControllerSpineLocationMid) 
{ 
    LeftPageController *left; 
    RightPageController *right; 
    if(m_pageController.viewControllers.count > 0) 
    { 
     left = [m_pageController.viewControllers objectAtIndex:0]; 

     right = [m_storyboard instantiateViewControllerWithIdentifier:@"rightPage"]; 
     [right loadView]; 
    } 

    [m_pageController setViewControllers:[NSArray arrayWithObjects:left, right, nil] direction:UIPageViewControllerNavigationDirectionForward | UIPageViewControllerNavigationDirectionReverse animated:NO completion:nil]; 

    [m_left hideGallery]; 
} 

if(m_pageController.spineLocation == UIPageViewControllerSpineLocationMin) 
{ 

    [m_pageController setViewControllers:[NSArray arrayWithObject:[m_pageController.viewControllers objectAtIndex:0]] direction:UIPageViewControllerNavigationDirectionForward | UIPageViewControllerNavigationDirectionReverse animated:NO completion:nil]; 
} 

[super viewWillAppear:animated]; 
} 


- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation 
{ 
if(UIInterfaceOrientationIsPortrait(orientation)) 
{ 
    LeftPageController *left = [pageViewController.viewControllers objectAtIndex:0]; 
    [pageViewController setViewControllers:[NSArray arrayWithObject:left] direction:UIPageViewControllerNavigationDirectionForward | UIPageViewControllerNavigationDirectionReverse animated:NO completion:nil]; 

    pageViewController.doubleSided = NO;  

    return UIPageViewControllerSpineLocationMin; 
} 

if(UIInterfaceOrientationIsLandscape(orientation)) 
{  
    LeftPageController *left; 
    RightPageController *right; 
    if(pageViewController.viewControllers.count > 0) 
    { 
     left = [pageViewController.viewControllers objectAtIndex:0]; 
     right = [m_storyboard instantiateViewControllerWithIdentifier:@"rightPage"]; 
     [right loadView]; 
    } 

    [pageViewController setViewControllers:[NSArray arrayWithObjects:left,right, nil] direction:UIPageViewControllerNavigationDirectionForward | UIPageViewControllerNavigationDirectionReverse animated:NO completion:nil]; 

    return UIPageViewControllerSpineLocationMid; 
} 

return UIPageViewControllerSpineLocationMin; 
} 

我知道我在做同样的事情两次，但多数民众赞成我愿意在这种情况下要付出的代价。为什么在调用pageViewController：spineLocationForInterfaceOrientation：并为Landscape设置两个视图控制器时，当SecondVC处于非活动状态时，在激活SecondVC之后，只有一个ViewController在m_pageController中的viewWillAppear：为我保留了一个谜。

Answer 2

我包括下面的代码在iOS 6中来解决这个问题：

- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation 
{ 

    NSArray *allPageControllers = pageViewController.viewControllers 

    if (allPageControllers != nil) { 
     [self setViewControllers:allPageControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil]; 
    } 

    else { 

     UIViewController *defaultViewController = [[UIViewController alloc] init]; 
     [self setViewControllers:[NSArray arrayWithObject:defaultViewController] direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil]; 
     [defaultViewController release]; 
    } 

    return UIPageViewControllerSpineLocationMin; 
} 

希望它可以帮助别人！