是否有可能在UIPageViewController中以编程方式打开页面？
是否有可能在UIPageViewController以编程方式打开页面？
是的，这是可能的方法：
- (void)setViewControllers:(NSArray *)viewControllers direction:(UIPageViewControllerNavigationDirection)direction animated:(BOOL)animated completion:(void (^)(BOOL finished))completion;`
这与用于在页面上设置第一个视图控制器的方法相同。 类似的，你可以使用它去其他页面。
不知道为什么viewControllers是一个数组，而不是一个单一的视图控制器？
这是因为一个页面视图控制器可以有一个“脊柱”（如在iBooks），一次显示2页的内容。 如果您一次显示1页的内容，那么只需传入1个元素的数组。
Swift中的一个例子：
pageContainer.setViewControllers([displayThisViewController], direction: .Forward, animated: true, completion: nil)
因为我也需要这个，所以我会详细介绍如何做到这一点。
注：我假设你使用标准的模板forms来生成你的UIPageViewController结构 – 当你调用它时，它既有modelViewController也有dataViewController 。 如果你不明白我写的是什么 – 回头创build一个使用UIPageViewController的新项目作为基础。 你会明白的。
所以，需要翻页到一个特定的页面包括设置上面列出的方法的各个部分。 对于这个练习，我假设这是一个有两个视图的横向视图。 另外，我将它作为一个IBAction来实现，以便它可以通过button按下或不button来完成 – 使select器调用并传入需要的项目也很容易。
所以，对于这个例子，你需要显示两个视图控制器，并且可以select是否在书中向前或向后。
请注意，我只是硬编码到第4页和第5页，并使用前滑。 从这里你可以看到，你所需要做的就是传递variables来帮助你获得这些项目。
-(IBAction) flipToPage:(id)sender { // Grab the viewControllers at position 4 & 5 - note, your model is responsible for providing these. // Technically, you could have them pre-made and passed in as an array containing the two items... DataViewController *firstViewController = [self.modelController viewControllerAtIndex:4 storyboard:self.storyboard]; DataViewController *secondViewController = [self.modelController viewControllerAtIndex:5 storyboard:self.storyboard]; // Set up the array that holds these guys... NSArray *viewControllers = nil; viewControllers = [NSArray arrayWithObjects:firstViewController, secondViewController, nil]; // Now, tell the pageViewContoller to accept these guys and do the forward turn of the page. // Again, forward is subjective - you could go backward. Animation is optional but it's // a nice effect for your audience. [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL]; // Voila' - c'est fin! }
这是另一个单个分页视图的代码示例。 viewControllerAtIndex的实现在这里省略，它应该返回给定索引的正确的视图控制器。
- (void)changePage:(UIPageViewControllerNavigationDirection)direction { NSUInteger pageIndex = ((FooViewController *) [_pageViewController.viewControllers objectAtIndex:0]).pageIndex; if (direction == UIPageViewControllerNavigationDirectionForward) { pageIndex++; } else { pageIndex--; } FooViewController *viewController = [self viewControllerAtIndex:pageIndex]; if (viewController == nil) { return; } [_pageViewController setViewControllers:@[viewController] direction:direction animated:YES completion:nil]; }
页面可以通过调用来改变
[self changePage:UIPageViewControllerNavigationDirectionReverse]; [self changePage:UIPageViewControllerNavigationDirectionForward];
这段代码对我很好，谢谢。
这是我做的。 一些向前或向后的方法，以及一种直接进入特定页面的方法。 它用于纵向视图中的6页文档。 如果将它粘贴到pageViewController模板的RootController的实现中，它将正常工作。
-(IBAction)pageGoto:(id)sender { //get page to go to NSUInteger pageToGoTo = 4; //get current index of current page DataViewController *theCurrentViewController = [self.pageViewController.viewControllers objectAtIndex:0]; NSUInteger retreivedIndex = [self.modelController indexOfViewController:theCurrentViewController]; //get the page(s) to go to DataViewController *targetPageViewController = [self.modelController viewControllerAtIndex:(pageToGoTo - 1) storyboard:self.storyboard]; DataViewController *secondPageViewController = [self.modelController viewControllerAtIndex:(pageToGoTo) storyboard:self.storyboard]; //put it(or them if in landscape view) in an array NSArray *theViewControllers = nil; theViewControllers = [NSArray arrayWithObjects:targetPageViewController, secondPageViewController, nil]; //check which direction to animate page turn then turn page accordingly if (retreivedIndex < (pageToGoTo - 1) && retreivedIndex != (pageToGoTo - 1)){ [self.pageViewController setViewControllers:theViewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL]; } if (retreivedIndex > (pageToGoTo - 1) && retreivedIndex != (pageToGoTo - 1)){ [self.pageViewController setViewControllers:theViewControllers direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:NULL]; } } -(IBAction)pageFoward:(id)sender { //get current index of current page DataViewController *theCurrentViewController = [self.pageViewController.viewControllers objectAtIndex:0]; NSUInteger retreivedIndex = [self.modelController indexOfViewController:theCurrentViewController]; //check that current page isn't first page if (retreivedIndex < 5){ //get the page to go to DataViewController *targetPageViewController = [self.modelController viewControllerAtIndex:(retreivedIndex + 1) storyboard:self.storyboard]; //put it(or them if in landscape view) in an array NSArray *theViewControllers = nil; theViewControllers = [NSArray arrayWithObjects:targetPageViewController, nil]; //add page view [self.pageViewController setViewControllers:theViewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL]; } } -(IBAction)pageBack:(id)sender { //get current index of current page DataViewController *theCurrentViewController = [self.pageViewController.viewControllers objectAtIndex:0]; NSUInteger retreivedIndex = [self.modelController indexOfViewController:theCurrentViewController]; //check that current page isn't first page if (retreivedIndex > 0){ //get the page to go to DataViewController *targetPageViewController = [self.modelController viewControllerAtIndex:(retreivedIndex - 1) storyboard:self.storyboard]; //put it(or them if in landscape view) in an array NSArray *theViewControllers = nil; theViewControllers = [NSArray arrayWithObjects:targetPageViewController, nil]; //add page view [self.pageViewController setViewControllers:theViewControllers direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:NULL]; } }
我完全可能在这里错过了一些东西，但是这个解决scheme似乎比其他人提出的要简单得多。
extension UIPageViewController { func goToNextPage(animated: Bool = true, completion: ((Bool) -> Void)? = nil) { if let currentViewController = viewControllers?[0] { if let nextPage = dataSource?.pageViewController(self, viewControllerAfter: currentViewController) { setViewControllers([nextPage], direction: .forward, animated: animated, completion: completion) } } } }
那么使用dataSource中的方法怎么样？
UIViewController *controller = [pageViewController.dataSource pageViewController:self.pageViewController viewControllerAfterViewController:pageViewController.viewControllers.firstObject]; [pageViewController setViewControllers:@[controller] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
类比为落后。
在Swift中 ：
import UIKit extension HomeViewController { // MARK: - Carousel management. func startTimerForMovingCarousel(let numberOfSecondsBetweenFiringsOfTheTimer: NSTimeInterval) { if (self.timerForMovingCarousel == nil) { self.timerForMovingCarousel = NSTimer.scheduledTimerWithTimeInterval(numberOfSecondsBetweenFiringsOfTheTimer, target: self, selector: "moveCarousel", userInfo: nil, repeats: true) } } func moveCarousel() { println("I move the carousel.") let currentContentViewControllerDisplayed = self.pageViewController!.viewControllers[0] as! ContentViewController var index: Int = currentContentViewControllerDisplayed.index if index == self.arrayViewControllers.count - 1 { index = 0 } else { ++index } let contentViewControllerToDisplay = self.arrayViewControllers[index] as! ContentViewController self.pageViewController.setViewControllers([contentViewControllerToDisplay], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil) self.pageControl.currentPage = contentViewControllerToDisplay.index } func invalidateTimerForMovingCarousel() { if (self.timerForMovingCarousel != nil) { self.timerForMovingCarousel.invalidate() self.timerForMovingCarousel = nil } } }
然而，使用这个'self.pageViewController setViewControllers'方法调用不会在viewController上为已经被拒绝的页面调用'viewDidDissapear'，而手动调用一个页面却会在被closures的页面上调用viewDidDissapear。 我相信这是我的崩溃的原因
“所提供的视图控制器的数量（0）与请求的转换所需的数量（1）不匹配”
我还需要一个button在PageViewController上向左导航，这个button应该完全符合您对滑动动作的期望。
由于我在“ pageViewController：viewControllerBeforeViewController ”里已经有了一些规则来处理自然的滑动导航，所以我希望button能够重用所有的代码，并且不能像以前一样使用特定的索引来访问页面答案确实。 所以，我必须采取一个替代解决scheme。
请注意，以下代码适用于页面视图控制器，它是我的自定义ViewController中的一个属性，其脊柱设置为中间值。
这里是我为左导航button写的代码：
- (IBAction)btnNavigateLeft_Click:(id)sender { // Calling the PageViewController to obtain the current left page UIViewController *currentLeftPage = [_pageController.viewControllers objectAtIndex:0]; // Creating future pages to be displayed NSArray *newDisplayedPages = nil; UIViewController *newRightPage = nil; UIViewController *newLeftPage = nil; // Calling the delegate to obtain previous pages // My "pageViewController:viewControllerBeforeViewController" method returns nil if there is no such page (first page of the book). newRightPage = [self pageViewController:_pageController viewControllerBeforeViewController:currentLeftPage]; if (newRightPage) { newLeftPage = [self pageViewController:_pageController viewControllerBeforeViewController:newRightPage]; } if (newLeftPage) { newDisplayedPages = [[NSArray alloc] initWithObjects:newLeftPage, newRightPage, nil]; } // If there are two new pages to display, show them with animation. if (newDisplayedPages) { [_pageController setViewControllers:newDisplayedPages direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:nil]; } }
你可以做一些非常相似的事情，从这里做一个正确的导航button。
正如@samwize指出的那样，分页的方式是通过使用
setViewControllers:array
这是我做的方式：我有我的数据源和委托单独。 您可以调用此方法，只更改“下一个”视图。 以前您必须应用分页规则。 也就是说，你必须检查方向和下一个控制器。 如果你在自定义数据源中使用该方法，那么你所显示的控制器数组将不会改变（因为你将在NSObject子类上使用自定义数组）。
使用你自己的数据源，该方法只是设置一个新的视图（具体的方向）。 由于您仍然可以控制正常滑动时将显示的页面。
我从昨天开始工作，最后我做了工作。 我无法完全使用标准模板，因为我有三个不同的viewControllers作为childviews：
1 - rootViewController; 2 - model; 3 - viewControllers 3.1 - VC1; 3.2 - VC2; 3.3 - VC3. Note: all of VCs has Storyboard ID.
我只需要在第一个VC中有一个触发button，所以我为pageViewController和model添加了一个属性：
#import <UIKit/UIKit.h> #import "Model.h" @interface VC1 : UIViewController @property (nonatomic, strong) UIPageViewController *thePageViewController; @property (nonatomic, strong) SeuTimePagesModel *theModel; @end
我重写了模型的init方法来传递storyboard和pageViewController作为参数，所以我可以将它们设置为我的VC1：
- (id)initWithStoryboard:(UIStoryboard *)storyboard andPageViewController:(UIPageViewController *)controller { if (self = [super init]) { VC1 *vc1 = [storyboard instantiateViewControllerWithIdentifier:@"VC1"]; vc1.pageViewController = controller; vc1.model = self; VC2 *vc2 = [storyboard instantiateViewControllerWithIdentifier:@"VC2"]; VC3 *vc3 = [storyboard instantiateViewControllerWithIdentifier:@"VC3"]; self.pageData = [[NSArray alloc] initWithObjects:vc1, vc2, vc3, nil]; } return self; }
最后，我在我的vc1中添加了一个IBAction来触发pageViewController方法setViewControllers：direction：animated：completion ：：
- (IBAction)go:(id)sender { VC2 *vc2 = [_model.pages objectAtIndex:1]; NSArray *viewControllers = @[vc2]; [_pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil]; }
注意我不需要findVC的索引，我的button把我带到了我的第二个VC，但并不难获得所有的索引，并跟踪你的childviews：
- (IBAction)selecionaSeuTime:(id)sender { NSUInteger index = [_model.pages indexOfObject:self]; index++; VC2 *vc2 = [_model.pages objectAtIndex:1]; NSArray *viewControllers = @[vc2]; [_pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil]; }
我希望它可以帮助你！
对于单页，我只是编辑了@Jack Humphries的答案
-(void)viewDidLoad { counter = 0; } -(IBAction)buttonClick:(id)sender { counter++; DataViewController *secondVC = [self.modelController viewControllerAtIndex:counter storyboard:self.storyboard]; NSArray *viewControllers = nil; viewControllers = [NSArray arrayWithObjects:secondVC, nil]; [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:NULL]; }
如果页面控制指示当前页面是O &&您希望页面通过滚动浏览和也通过单击页面视图控制器中的自定义button，下面可能会有所帮助。
//Set Delegate & Data Source for PageView controller [Say in View Did Load] self.pageViewController.dataSource = self; self.pageViewController.delegate = self; // Delegates called viewControllerBeforeViewController when User Scroll to previous page - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController{ [_nextBtn setTitle:@"Next" forState:UIControlStateNormal]; NSUInteger index = ((PageContentViewController*) viewController).pageIndex; if (index == NSNotFound){ return nil; }else if (index > 0){ index--; }else{ return nil; } return [self viewControllerAtIndex:index]; }
//当用户滚动到下一页时，委托调用viewControllerAfterViewController
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController{ NSUInteger index = ((PageContentViewController*) viewController).pageIndex; if (index == NSNotFound){ return nil; }else if (index < 3){ index++; }else{ return nil; } return [self viewControllerAtIndex:index];} //Delegate called while transition of pages. The need to apply logic in this delegate is to maintain the index of current page. - (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray *)pendingViewControllers{ buttonIndex = (int)((PageContentViewController*) pendingViewControllers.firstObject).pageIndex;
}
-(void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed{ if (buttonIndex == 0){ _backButton.hidden = true; }else if (buttonIndex == [self.pageImages count] - 1){ _backButton.hidden = false; [_nextBtn setTitle:@"Begin" forState:UIControlStateNormal]; }else{ _backButton.hidden = false; }
}
//自定义button的（上一个和下一个）逻辑
-(void)backBtnClicked:(id)sender{ if (buttonIndex > 0){ buttonIndex -= 1; } if (buttonIndex < 1) { _backButton.hidden = YES; } if (buttonIndex >=0) { [_nextBtn setTitle:@"Next" forState:UIControlStateNormal]; PageContentViewController *startingViewController = [self viewControllerAtIndex:buttonIndex]; NSArray *viewControllers = @[startingViewController]; [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil]; }
}
-(void)nextBtnClicked:(id)sender{ if (buttonIndex < 3){ buttonIndex += 1; } if(buttonIndex == _pageImages.count){ //Navigate Outside Pageview controller }else{ if (buttonIndex ==3) { [_nextBtn setTitle:@"Begin" forState:UIControlStateNormal]; } _backButton.hidden = NO; PageContentViewController *startingViewController = [self viewControllerAtIndex:buttonIndex]; NSArray *viewControllers = @[startingViewController]; [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil]; }
}
//BUTTON INDEX & MAX COUNT -(NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController{ return [self.pageImages count];} -(NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController{ return buttonIndex;}
- (void)moveToPage { NSUInteger pageIndex = ((ContentViewController *) [self.pageViewController.viewControllers objectAtIndex:0]).pageIndex; pageIndex++; ContentViewController *viewController = [self viewControllerAtIndex:pageIndex]; if (viewController == nil) { return; } [self.pageViewController setViewControllers:@[viewController] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil]; }
//现在调用这个方法
[self moveToPage];
我希望它的作品:)
