Question

我对UIPageViewControllers提出了一些策略问题。它似乎完全符合我的要求，但有一些我不确定的事情。我想也许有人可能有一两块宝石要分享。 :)

所以这里是：我想使用PageViewCtl以纵向或横向模式显示内容，但是，无论设备的方向如何，它们都必须位于同一个控制器中（即具有相同的视图）是。原因是内容必须以这样的方式（在横向方向上）可缩放，使得内容的“页面”一次缩放，而不是单独缩放。此时，我无法真正看到如何在PageViewCtl中处理这个问题，因为据我所知，您无法在两个视图控制器之间共享视图。那么有人对这个问题有任何见解吗？非常感谢提前！

Answer 1

我从Erica Sadun那里偷了这个（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＆amp;＆amp;（leftPage％2））leftPage--;”，这可确保左页始终是奇数页。

-A

PageViewController和Orientation更改

1 个答案: