将（垂直）UIPageViewController 嵌套在另一个（水平）UIPageViewcontroller 中

Question

我的UIPageViewController 有一个大问题。我想使用部分和子部分在我的应用程序中呈现内容。因此，我创建了UIPageViewController 的“两个” 实例 - 水平（红色）和垂直（蓝色）：

之前我说过我创建了“两个”实例 - 这并不完全正确 - 可能有数十个实例，但同时只呈现 2 个，你知道我的意思。两个控制器都将transitionStyle 设置为UIPageViewControllerTransitionStyleScroll。

红色的UIPageViewController负责部分之间的水平滚动，蓝色负责垂直滚动。

它们在分开时都可以工作，但是当我将垂直的UIPageViewController 放在水平位置时，垂直的会停止工作。

我的代码如下：

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水平UIPageViewController创建

self.mainPageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:@{UIPageViewControllerOptionInterPageSpacingKey:[NSNumber numberWithFloat:0]}];
self.mainPageViewController.dataSource = self;
self.mainPageViewController.delegate = self;

self.pdfDocsURLs = @[ @{@"v":[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"1v" ofType:@"pdf"]],
                        @"h":[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"1h" ofType:@"pdf"]]},

                      @{@"v":[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"2v" ofType:@"pdf"]],
                        @"h":[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"2h" ofType:@"pdf"]]},

                      @{@"v":[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"3v" ofType:@"pdf"]],
                        @"h":[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"3h" ofType:@"pdf"]]}];

UIIndexedPageViewController *pvc = [[UIIndexedPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationVertical options:@{UIPageViewControllerOptionInterPageSpacingKey:[NSNumber numberWithFloat:0]}];
pvc.index = 1;
PDFDocument *vdoc = [[PDFDocument alloc] initWithPDFFileURL:self.pdfDocsURLs[0][@"v"] password:nil];
PDFDocument *hdoc = [[PDFDocument alloc] initWithPDFFileURL:self.pdfDocsURLs[0][@"h"] password:nil];
PDFSinglePageViewController *svc = [[PDFSinglePageViewController alloc] initWithVerticalPDF:vdoc horizontalPDF:hdoc page:1];
[pvc setViewControllers:@[svc] direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];

[self.mainPageViewController setViewControllers:@[pvc] direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];

需要明确的是，UIIndexedPageViewController 是 UIPVC 的子类，具有额外的 NSUInteger index 属性。它的实现是空的——它不会覆盖任何方法。

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UIPageViewControllerdataSource 方法

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
    if(pageViewController == self.mainPageViewController) { // if horizontal
        UIIndexedPageViewController *ivc = (UIIndexedPageViewController *)viewController;
        if(ivc.index == self.pdfDocsURLs.count) return nil;
        UIIndexedPageViewController *pvc = [[UIIndexedPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationVertical options:@{UIPageViewControllerOptionInterPageSpacingKey:[NSNumber numberWithFloat:0]}];
        pvc.index = ivc.index+1;
        PDFDocument *vdoc = [[PDFDocument alloc] initWithPDFFileURL:self.pdfDocsURLs[ivc.index][@"v"] password:nil];
        PDFDocument *hdoc = [[PDFDocument alloc] initWithPDFFileURL:self.pdfDocsURLs[ivc.index][@"h"] password:nil];
        PDFSinglePageViewController *svc = [[PDFSinglePageViewController alloc] initWithVerticalPDF:vdoc horizontalPDF:hdoc page:1];
        [pvc setViewControllers:@[svc] direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
        return pvc;
    } else { // if vertical - THE CODE BELOW IS NEVER EXECUTED
        PDFSinglePageViewController *ovc = (PDFSinglePageViewController *)viewController;
        NSUInteger nop = 0;
        if(UIInterfaceOrientationIsPortrait(ovc.interfaceOrientation)) nop = ovc.verticalDoc.numberOfPages;
        else if(UIInterfaceOrientationIsLandscape(ovc.interfaceOrientation)) nop = ovc.horizontalDoc.numberOfPages;
        if(ovc.page == nop) return nil;
        PDFSinglePageViewController *svc = [[PDFSinglePageViewController alloc] initWithVerticalPDF:ovc.verticalDoc horizontalPDF:ovc.horizontalDoc page:ovc.page+1];
        return svc;
    }
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
    if(pageViewController == self.mainPageViewController) { // if horizontal
        UIIndexedPageViewController *ivc = (UIIndexedPageViewController *)viewController;
        if(ivc.index == 1) return nil;
        UIIndexedPageViewController *pvc = [[UIIndexedPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationVertical options:@{UIPageViewControllerOptionInterPageSpacingKey:[NSNumber numberWithFloat:0]}];
        pvc.index = ivc.index-1;
        PDFDocument *vdoc = [[PDFDocument alloc] initWithPDFFileURL:self.pdfDocsURLs[ivc.index-2][@"v"] password:nil];
        PDFDocument *hdoc = [[PDFDocument alloc] initWithPDFFileURL:self.pdfDocsURLs[ivc.index-2][@"h"] password:nil];
        PDFSinglePageViewController *svc = [[PDFSinglePageViewController alloc] initWithVerticalPDF:vdoc horizontalPDF:hdoc page:1];
        [pvc setViewControllers:@[svc] direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
        return pvc;
    } else { // is vertical - THE CODE BELOW IS NEVER EXECUTED
        PDFSinglePageViewController *ovc = (PDFSinglePageViewController *)viewController;
        NSUInteger nop = 0;
        if(UIInterfaceOrientationIsPortrait(ovc.interfaceOrientation)) nop = ovc.verticalDoc.numberOfPages;
        else if(UIInterfaceOrientationIsLandscape(ovc.interfaceOrientation)) nop = ovc.horizontalDoc.numberOfPages;
        if(ovc.page == 1) return nil;
        PDFSinglePageViewController *svc = [[PDFSinglePageViewController alloc] initWithVerticalPDF:ovc.verticalDoc horizontalPDF:ovc.horizontalDoc page:ovc.page-1];
        return svc;
    }
}

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因此，水平的UIPageViewController 似乎不允许垂直的甚至接收平移手势识别器。

---

我的问题是......有没有办法让垂直的UIPageViewController 接收触摸并双向滚动？

任何帮助将不胜感激。

Answer 1

我忘记为我的垂直页面视图控制器分配 dataSource 和 delegate 属性

• -pageViewController:viewControllerBeforeViewController:
• -pageViewController:viewControllerAfterViewController:

问题解决了，一切正常。