Question

我有一个带有2个VC（索引0和1）的UIPageViewController，我想避免用户在第一个视图（索引0）上向右滚动并在第二个视图（索引1）上向左滚动

有没有人可以告诉我该怎么做？

谢谢！

Answer 1

尝试使用这些数据源方法：

@SWIFT版

public func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
    var index = viewControllers.indexOf(viewController)
    if index == 0 || index == NSNotFound {
        return nil
    }

    index--
    return viewControllerAtIndex(index)
}

public func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
    var index = viewControllers.indexOf(viewController)
    if index == NSNotFound {
        return nil
    }

    index++
    if index == viewControllers?.count {
        return nil
    }

    return viewControllerAtIndex(index)
}

@OBJC版

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
    NSInteger index = [viewControllerArray indexOfObject:viewController];

    if ((index == NSNotFound) || (index == 0)) {
        return nil;
    }

    index--;
    return [viewControllerArray objectAtIndex:index];
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
    NSInteger index = [viewControllerArray indexOfObject:viewController];

    if (index == NSNotFound) {
        return nil;
    }
    index++;

    if (index == [viewControllerArray count]) {
        return nil;
    }
    return [viewControllerArray objectAtIndex:index];
}

Answer 2

您可以使用UIPageViewcontroller的Index值来实现此目的。但这很痛苦......让你检查一下。

避免用户使用UIPageViewController滚动到索引-1和2

2 个答案: