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我UIPageViewController用来显示两个视图控制器。我希望这个视图控制器显示在不同的页面中，并且on swiping页面应该被翻转。当我在 iPad 模拟器 6.0 中运行它时，它工作正常，但是当我在 iPad 模拟器 5.1 中运行它时，两个视图控制器都显示在同一页面上。这是代码

NSDictionary *options =  [NSDictionary dictionaryWithObject:[NSNumber numberWithInteger:UIPageViewControllerSpineLocationMid] forKey:UIPageViewControllerOptionSpineLocationKey];

self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl
                                                              navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:options];

    //Step 2:
    //Assign the delegate and datasource as self.
    self.pageViewController.delegate = self;
    self.pageViewController.dataSource = self;

    //Step 3:
    //Set the initial view controllers.
    GameSelectViewController *gameViewController = [[GameSelectViewController alloc] initWithNibName:@"GameSelectViewController" bundle:nil];

    HighscoreViewController *highScoreViewController = [[HighscoreViewController alloc] initWithNibName:@"HighscoreViewController" bundle:nil];

    viewControllers = [NSArray arrayWithObjects:highScoreViewController,gameViewController, nil];

    [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];

    //Step 4:
    //ViewController containment steps
    //Add the pageViewController as the childViewController
    [self addChildViewController:self.pageViewController];

    //Add the view of the pageViewController to the current view
    [self.view addSubview:self.pageViewController.view];

    //Call didMoveToParentViewController: of the childViewController, the UIPageViewController instance in our case.
    [self.pageViewController didMoveToParentViewController:self];

    //Step 5:
    // set the pageViewController's frame as an inset rect.
    self.pageViewController.view.frame = self.view.frame;

我是 iPhone 开发的新手。请只做那些需要的。谢谢。

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