iOS:UIPageViewController - 使用按钮跳转到下一页

Question

我在 PageViewController 中有一系列 VC，用户可以用手指从左到右导航。我需要添加按钮，这些按钮基本上执行与手指滑动相同的操作，通过 VC 向左或向右移动一个。我怎样才能做到这一点？现在我正在使用这两种方法在用户滑动时动态设置 VC:

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController          viewControllerBeforeViewController:(UIViewController *)viewController;

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController;

如果用户点击按钮，我是否可以做同样的事情？

Answer 1

您可以在页面 View Controller 上使用 setViewControllers:direction:animated:completion: 以编程方式设置当前显示的带有过渡动画的 View Controller 。

这是一个使用随机背景颜色呈现 View Controller 的示例。您可以调整它以使用您的特定 View Controller 。

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.pvc = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
    self.pvc.view.frame = CGRectInset(self.view.bounds, 200, 200);
    [self.view addSubview:self.pvc.view];

    [self.pvc setViewControllers:@[[self randomVC]] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
}

-(UIViewController*)randomVC
{
    UIViewController *vc = [[UIViewController alloc] init];
    UIColor *color = [UIColor colorWithRed:arc4random_uniform(255)/255.0 green:arc4random_uniform(255)/255.0 blue:arc4random_uniform(255)/255.0 alpha:1];
    vc.view.backgroundColor = color;
    return vc;
}

- (IBAction)previousButtonPressed:(id)sender {
    [self.pvc setViewControllers:@[[self randomVC]] direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:nil];
}

- (IBAction)nextButtonPressed:(id)sender {
    [self.pvc setViewControllers:@[[self randomVC]] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
}