在容器视图控制器中旋转UIPageViewController

Question

在容器视图控制器中旋转UIPageViewController

containersuipageviewcontrollerscreen-rotation

6

我有一个包含其他视图控制器的UIViewController。在viewDidLoad中设置初始视图控制器：

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;

该容器控制器已经实现了automaticallyForwardAppearanceAndRotationMethodsToChildViewControllers方法并返回了YES。它还实现了将旋转变化手动转发给非活跃的视图控制器。

- (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];
    }
}

当菜单按钮被点击时，我会在视图控制器之间进行转换。

- (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;
    }];
}

这个转换对于我“普通”的视图控制器来说是可以正常工作的，即使它们不是活动状态，在方向改变后也会正常显示。然而，其中一个子视图控制器称为SecondCV，它有一个UIPageViewController作为子视图控制器。我已经将UIPageViewControllerDelegate和UIPageViewControllerDataSource设置为这个SecondCV，并在pageViewController：spineLocationForInterfaceOrientation:中返回了Portrait的UIPageViewControllerSpineLocationMin和Landscape的UIPageViewControllerSpineLocationMid。当这个SecondVC处于活动状态时，它的旋转是正确的 - 两个页面在横向模式下，一个页面在纵向模式下都被正确地显示。但当这个SecondVC不活动时，旋转是不正确的。即使调用了pageViewController：spineLocationForInterfaceOrientation：, 在纵向和横向模式下仍然只有一个页面。我试图解决这个问题有一段时间了，但我没有看到其他任何选择。你有没有什么想法如何解决这个问题？

谢谢。

- DaNY

2个回答

0

我在iOS 6中包含了以下代码来解决这个问题：

- (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;
}

希望能对某人有所帮助！

- NicTesla

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- DaNY · Accepted Answer

我已经解决了这种棘手的问题。

实际上，SecondVC已经正确旋转，或者至少脊柱位置已经正确更改。所以当我旋转设备时，SecondVC不是父视图中的活动视图控制器，它仍然接收到旋转消息，并且也调用了pageViewController:spineLocationForInterfaceOrientation:。我为新的界面方向设置了正确的脊柱位置，并调用了SecondVC的页面视图控制器的setViewControllers。问题在于，即使我将两个视图控制器设置为UIPageViewControllerSpineLocationMid，在显示SecondVC后，仍然只有一个，就像在UIPageViewControllerSpineLocationMin中一样。

我通过在viewWillAppear:中再次将视图控制器设置为页面视图控制器来“修复”问题，因为当调用此方法时，页面视图控制器的脊柱位置是正确的，并且基于此信息，我设置了一个或两个页面（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，但这是我愿意为此付出的代价。为什么在调用pageViewController:spineLocationForInterfaceOrientation:并为横向设置了两个视图控制器后，当SecondVC处于非活动状态时，在激活SecondVC后，在viewWillAppear:中m_pageController中只有一个视图控制器，这仍然是个谜。