禁用UIPageViewController反弹

为这个search了很多，但是还找不到合适的解决scheme。

是否有可能禁用UIPageViewController的反弹效果，仍然使用UIPageViewControllerTransitionStyleScroll ？

Answer 1

禁用UIPageViewController的反弹

1. 将<UIScrollViewDelegate>委托添加到您的UIPageViewController的标题

2. 将UIPageViewController的底层UIScrollView的委托设置为其父级viewDidLoad ：

    for (UIView *view in self.view.subviews) { if ([view isKindOfClass:[UIScrollView class]]) { ((UIScrollView *)view).delegate = self; break; } } 

3. scrollViewDidScroll的实现是在用户超出边界时将contentOffset重置为原点（ NOT（0,0），但是（bound.size.width，0） ），如下所示：

    - (void)scrollViewDidScroll:(UIScrollView *)scrollView { if (_currentPage == 0 && scrollView.contentOffset.x < scrollView.bounds.size.width) { scrollView.contentOffset = CGPointMake(scrollView.bounds.size.width, 0); } else if (_currentPage == totalViewControllersInPageController-1 && scrollView.contentOffset.x > scrollView.bounds.size.width) { scrollView.contentOffset = CGPointMake(scrollView.bounds.size.width, 0); } } 

4. 最后， scrollViewWillEndDragging的实现是处理一个错误情况，当用户在第一页从左向右快速滑动时，第一页不会在左边反弹（由于上面的函数），但是会在由（或许）速度的滑动造成的。 最后，当弹回时，UIPageViewController会触发一个翻页到第二页（这当然不是预期的）。

    - (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset { if (_currentPage == 0 && scrollView.contentOffset.x <= scrollView.bounds.size.width) { *targetContentOffset = CGPointMake(scrollView.bounds.size.width, 0); } else if (_currentPage == totalViewControllersInPageController-1 && scrollView.contentOffset.x >= scrollView.bounds.size.width) { *targetContentOffset = CGPointMake(scrollView.bounds.size.width, 0); } } 

Answer 2

禁用UIPageViewController的反弹

Swift 2.2

除了答案

1）将UIScrollViewDelegate添加到UIPageViewController

 extension PageViewController: UIScrollViewDelegate 

2）添加到viewDidLoad

 for view in self.view.subviews { if let scrollView = view as? UIScrollView { scrollView.delegate = self } } 

3）添加UIScrollViewDelegate方法

 func scrollViewDidScroll(scrollView: UIScrollView) { if currentIndex == 0 && scrollView.contentOffset.x < scrollView.bounds.size.width { scrollView.contentOffset = CGPoint(x: scrollView.bounds.size.width, y: 0) } else if currentIndex == totalViewControllers - 1 && scrollView.contentOffset.x > scrollView.bounds.size.width { scrollView.contentOffset = CGPoint(x: scrollView.bounds.size.width, y: 0) } } func scrollViewWillEndDragging(scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) { if currentIndex == 0 && scrollView.contentOffset.x < scrollView.bounds.size.width { scrollView.contentOffset = CGPoint(x: scrollView.bounds.size.width, y: 0) } else if currentIndex == totalViewControllers - 1 && scrollView.contentOffset.x > scrollView.bounds.size.width { scrollView.contentOffset = CGPoint(x: scrollView.bounds.size.width, y: 0) } } 

Answer 3

我不知道如何正确pipe理currentIndex但最终做了

 extension Main: UIPageViewControllerDelegate { func pageViewController(pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) { if completed { guard let viewController = pageViewController.viewControllers?.first, index = viewControllerDatasource.indexOf(viewController) else { fatalError("Can't prevent bounce if there's not an index") } currentIndex = index } } } 

Answer 4

UIPageViewController实际上并没有为你做很多事情。 你可以很容易地使用视图控制器的UIScrollView，并禁用该反弹。

只要做一些像

 int x=0; for (NSString *storyboardID in storyboardIDs){ UIViewController *vc = [storyboard instantiateViewControllerWithIdentifier:storyboardID]; [self addChildViewController:vc]; vc.view.frame = CGRectMake(x++*vc.view.frame.size.width, 0, vc.view.frame.size.width, vc.view.frame.size.height); [self.scrollView addSubview:vc.view]; [vc didMoveToParentViewController:self]; self.scrollView.contentSize = CGSizeMake(storyboardIDs.count*vc.view.frame.size.width, vc.view.frame.size.height); } 

Answer 5

如果您尝试在UIPageViewController.scrollView上禁用反弹， UIPageViewController.scrollView得到一个损坏的pageViewController 。 滑动将无法使用。 所以，不要试图做这样的事情：

 self.theScrollView.alwaysBounceHorizontal = NO; self.theScrollView.bounces = NO; 

在UIPageViewController子视图中使用searchscrollView引用的解决scheme仅用于完全禁用滚动：

 @interface MyPageViewController : UIPageViewController @property (nonatomic, assign) BOOL scrollEnabled; @end @interface MyPageViewController () @property (nonatomic, weak) UIScrollView *theScrollView; @end @implementation MyPageViewController - (void)viewDidLoad { [super viewDidLoad]; for (UIView *view in self.view.subviews) { if ([view isKindOfClass:UIScrollView.class]) { self.theScrollView = (UIScrollView *)view; break; } } } - (void)setScrollEnabled:(BOOL)scrollEnabled { _scrollEnabled = scrollEnabled; self.theScrollView.scrollEnabled = scrollEnabled; } @end 

在UIPageViewController上禁用反弹的解决scheme：

1. 创buildUIScrollView类别（例如CustomScrolling）。 UIScrollView已经是他们的手势识别器的代表了。
2. 请注意，您的目标UIViewController （又名baseVC with UIPageViewController里面）通过AppDelegate共享。 否则，您可以使用运行时（ #import <objc/runtime.h> ）并将引用属性（添加到控制器baseVC ）添加到类别中。

3. 实施类别：

    @interface UIScrollView (CustomScrolling) <UIGestureRecognizerDelegate> @end @implementation UIScrollView (CustomScrolling) - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer { UIViewController * baseVC = [(AppDelegate *)[[UIApplication sharedApplication] delegate] baseVC]; if (gestureRecognizer.view == baseVC.pageViewController.theScrollView) { NSInteger page = [baseVC selectedIndex]; NSInteger total = [baseVC viewControllers].count; UIPanGestureRecognizer *recognizer = (UIPanGestureRecognizer *)gestureRecognizer; CGPoint velocity = [recognizer velocityInView:self]; BOOL horizontalSwipe = fabs(velocity.x) > fabs(velocity.y); if (!horizontalSwipe) { return YES; } BOOL scrollingFromLeftToRight = velocity.x > 0; if ((scrollingFromLeftToRight && page > 0) || (!scrollingFromLeftToRight && page < (total - 1))) { return YES; } return NO; } return YES; } @end 

4. 在您的baseVC中使用UIPageViewController导入类别文件#import "UIScrollView+CustomScrolling.h" 。

Answer 6

编辑：不要使用这个解决scheme。 后来我了解到，这引入了一个大约5％的时间，用户不能在同一方向页面的错误。 他们必须回头，然后再继续前进。

如果您使用的是UIPageViewControllerDataSource ，则相对简单的解决方法（以及一点点哈希）是每次pageViewController:viewControllerBeforeViewController: delegate方法时禁用弹跳。 这是一个示例实现：

 @interface YourDataSourceObject () @property (strong, nonatomic) UIScrollView *scrollView; @end @implementation - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController { if (!self.scrollView) { for (UIView *view in pageViewController.view.subviews) { if ([view isKindOfClass:[UIScrollView class]]) { self.scrollView = (UIScrollView *)view; } } } self.scrollView.bounces = NO; // Your other logic to return the correct view controller. } @end