PageViewController和方向更改

Question

我有一个关于UIPageViewControllers的策略问题。它似乎完全符合我的要求，但有一些我不确定的事情。我想也许有人可能会有一两个宝石分享。 :)

所以在这里：我想使用以纵向或横向模式显示内容，但是，无论设备是什么方向，它们必须位于同一个控制器中（即具有相同的视图） 。原因在于内容必须以这种方式（横向）来缩放，以致两个内容的“页面”一次放大，而不是单独放大。此时，我无法真正了解如何在中处理这个问题，因为据我所知，您无法在2个视图控制器之间共享视图。那么有没有人对这个问题有所了解？非常感谢提前！

Answer 1

我偷了这从埃里卡丧盾（https://github.com/erica/iOS-5-Cookbook）：

// Update interface to the given page 
- (void) fetchControllersForPage: (uint) requestedPage orientation: (UIInterfaceOrientation) orientation 
{ 
    BOOL sideBySide = [self useSideBySide:orientation]; 
    int numberOfPagesNeeded = sideBySide ? 2 : 1; 
    int currentCount = self.viewControllers.count; 

    uint leftPage = requestedPage; 
    if (sideBySide && (leftPage % 2)) leftPage--; 

    // Only check against current page when count is appropriate 
    if (currentCount && (currentCount == numberOfPagesNeeded)) 
    { 
     if (pageNumber == requestedPage) return; 
     if (pageNumber == leftPage) return; 
    } 

    // Decide the prevailing direction by checking the new page against the old 
    UIPageViewControllerNavigationDirection direction = (requestedPage > pageNumber) ? UIPageViewControllerNavigationDirectionForward : UIPageViewControllerNavigationDirectionReverse; 
    [self updatePageTo:requestedPage]; 

    // Update the controllers 
    NSMutableArray *pageControllers = [NSMutableArray array]; 
    SAFE_ADD(pageControllers, [self controllerAtPage:leftPage]);  
    if (sideBySide) 
     SAFE_ADD(pageControllers, [self controllerAtPage:leftPage + 1]); 

    [self setViewControllers:pageControllers direction: direction animated:YES completion:nil]; 
} 

// Entry point for external move request 
- (void) moveToPage: (uint) requestedPage 
{ 
    [self fetchControllersForPage:requestedPage orientation:(UIInterfaceOrientation)[UIDevice currentDevice].orientation]; 
} 

#pragma mark Delegate 

- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation 
{ 
    NSUInteger indexOfCurrentViewController = 0; 
    if (self.viewControllers.count) 
     indexOfCurrentViewController = ((UIViewController *)[self.viewControllers objectAtIndex:0]).view.tag; 
    [self fetchControllersForPage:indexOfCurrentViewController orientation:orientation]; 

    BOOL sideBySide = [self useSideBySide:orientation]; 
    self.doubleSided = sideBySide; 

    UIPageViewControllerSpineLocation spineLocation = sideBySide ? UIPageViewControllerSpineLocationMid : UIPageViewControllerSpineLocationMin; 
    return spineLocation; 
} 

给她一些爱。并注意超级聪明的“if（sideBySide & &（leftPage％2））leftPage--;”，它确保左页始终是奇数页。

-A