UIPageViewController在iOS中自动滚动
问题描述：
我正在制作一个应用程序，其中PageViewController应该在某个时间间隔内滚动。目前我已完成手动滚动。用户可以滚动任何图像，它会工作。但坚持实现用户触摸自动滚动。以下是我的代码。请帮助我。UIPageViewController在iOS中自动滚动
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
_pageTitles = @[@"", @"", @"", @""];
_pageImages = @[@"page1.png", @"page2.png", @"page3.png", @"page4.png"];
// Create page view controller
self.pageViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageViewController"];
self.pageViewController.dataSource = self;
PageContentViewController *startingViewController = [self viewControllerAtIndex:0];
NSArray *viewControllers = @[startingViewController];
[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
// Change the size of page view controller
self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height - 50);
[self addChildViewController:_pageViewController];
[self.view addSubview:_pageViewController.view];
[self.pageViewController didMoveToParentViewController:self];
}
- (PageContentViewController *)viewControllerAtIndex:(NSUInteger)index
{
if (([self.pageTitles count] == 0) || (index >= [self.pageTitles count])) {
return nil;
}
// Create a new view controller and pass suitable data.
PageContentViewController *pageContentViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageContentViewController"];
pageContentViewController.imageFile = self.pageImages[index];
pageContentViewController.titleText = self.pageTitles[index];
pageContentViewController.pageIndex = index;
return pageContentViewController;
}
-(void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:YES];
self.navigationController.navigationBar.hidden = YES;
}
#pragma mark - Page View Controller Data Source
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
NSUInteger index = ((PageContentViewController*) viewController).pageIndex;
if ((index == 0) || (index == NSNotFound)) {
return nil;
}
index--;
return [self viewControllerAtIndex:index];
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
NSUInteger index = ((PageContentViewController*) viewController).pageIndex;
if (index == NSNotFound) {
return nil;
}
index++;
if (index == [self.pageTitles count]) {
return nil;
}
return [self viewControllerAtIndex:index];
}
- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController
{
return [self.pageTitles count];
}
- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController
{
return 0;
}
答
@Daniel你的链接查看documentation坏了，你的“答案”做一点解释你解决问题的方法。对于那些有兴趣阅读UIPageViewController Class的文档。
要注意这里的方法是：
- (void)setViewControllers:(NSArray *)viewControllers
direction:(UIPageViewControllerNavigationDirection)direction
animated:(BOOL)animated
completion:(void (^)(BOOL finished))completion
的UIPageViewController希望你告诉它提供什么样的数据，并使用基于值什么控制器。这里我告诉我的UIPageController子类是委托和数据访问。配置委托方法和viewControllerAtIndex数据源方法后，我添加了一个自定义时间间隔，它调用了我的loadNextController方法。在该方法中，我正在检查“下一个”控制器是否为零。如果它不是零，我将“下一个”控制器作为@ [启动控制器]传递给第二次调用setViewControllers。如果它是零，我只是将索引值重置为零，并使用我的“下一个”控制器作为@ [起始控制器]调用setViewControllers。这个自定义子类用于自动寻呼到下一个或第一个控制器。奖励是用户交互仍然由UIPageViewController Class处理。
注意：初始调用setViewControllers是必需的，因为您的UIPageViewContrller不知道如果可以首先加载任何viewController。我第二次调用setViewControllers只不过是跳到下一个或第一个viewController。
- (void)viewDidLoad {
[super viewDidLoad];
self.index = 0;
self.delegate = self;
self.dataSource = self;
/*! setup an interval */
[NSTimer scheduledTimerWithTimeInterval:10.0
target:self
selector:@selector(loadNextController)
userInfo:nil
repeats:YES];
/*! set starting controller */
NSArray *startingViewControllers = @[[self viewControllerAtIndex:self.index]];
[self setViewControllers: startingViewControllers
direction: UIPageViewControllerNavigationDirectionForward
animated: YES
completion: nil];
}
- (UIViewController*)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
NSUInteger index = ((YSPageContentViewController*) viewController).pageIndex;
if (index > 0) {
return [self viewControllerAtIndex:index-1];
}
return nil;
}
- (UIViewController*)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
NSUInteger index = ((YSPageContentViewController*) viewController).pageIndex;
if (index+1 < [self.items count]) {
return [self viewControllerAtIndex:index+1];
}
return nil;
}
- (PageContentViewController *)viewControllerAtIndex:(NSUInteger)index{
if (index < [self.items count]) {
PageContentViewController *pageContentViewController = [[PageContentViewController alloc]init];
pageContentViewController.pageIndex = index;
pageContentViewController.image = (UIImage*)self.items[index];
return pageContentViewController;
}
return nil;
}
/*! set next controller */
- (void)loadNextController {
PageContentViewController *nextViewController = [self viewControllerAtIndex:self.index++];
if (nextViewController == nil) {
self.index = 0;
nextViewController = [self viewControllerAtIndex:self.index];
}
[self setViewControllers:@[nextViewController]
direction:UIPageViewControllerNavigationDirectionForward
animated:YES
completion:nil];
}
注意：这是行不通的;但是，当内部手势识别器更改控制器时，我并不总是返回正确的控制器。一路上我正在失去对指数的追踪。我会用我的完成实施更新这个。
答
也许你正在寻找的方法是setViewControllers:direction:animated:completion:
当然，你需要提供你想在动画的最后看到的视图控制器。
您可以通过动画集调用此为YES，控制器将自动页面:)
更多
答
工作@ Ryan的回答。修正@Ryan问题“，但是当内部手势识别器改变控制器时，我并不总是返回正确的控制器。在这个过程中，我正在失去对索引的跟踪。
只编辑了几行，它为我工作。如果有人需要相同的话，可以考虑分享。
- (void)viewDidLoad
{
[super viewDidLoad];
_pageTitles = @[@"Tips n Tricks", @"Join to learn", @"Share to get points"];
self.pageViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageViewController"];
self.pageViewController.dataSource = self;
self.pageViewController.delegate = self;
[NSTimer scheduledTimerWithTimeInterval:10.0
target:self
selector:@selector(loadNextController)
userInfo:nil
repeats:YES];
PageContentViewController *startingViewController = [self viewControllerAtIndex:0];
NSArray *viewControllers = @[startingViewController];
[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
// Change the size of page view controller
self.pageViewController.view.frame = _containerView.frame;
self.pageControl.numberOfPages = _pageTitles.count;
self.pageControl.currentPage = 0;
[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
[self addChildViewController:_pageViewController];
[self.view addSubview:_pageViewController.view];
[self.pageViewController didMoveToParentViewController:self];
[self.view bringSubviewToFront:self.pageControl];
}
实现数据源PageViewController
的方法- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
NSUInteger index = ((PageContentViewController*) viewController).pageIndex;
if ((index == 0) || (index == NSNotFound)) {
index = _pageTitles.count;
}
index--;
return [self viewControllerAtIndex:index];
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
NSUInteger index = ((PageContentViewController*) viewController).pageIndex;
if (index == NSNotFound) {
return nil;
}
index++;
if (index == [self.pageTitles count]) {
index = 0;
}
return [self viewControllerAtIndex:index];
}
- (PageContentViewController *)viewControllerAtIndex:(NSUInteger)index
{
if (([self.pageTitles count] == 0) || (index >= [self.pageTitles count])) {
return nil;
}
PageContentViewController *pageContentViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageContentViewController"];
pageContentViewController.titleText = self.pageTitles[index];
pageContentViewController.pageIndex = index;
return pageContentViewController;
}
实施didFinishAnimating方法去获得PageViewController的当前索引和更新的PageControl相应
- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed
{
PageContentViewController *currentViewController = pageViewController.viewControllers[0];
currentIndex = (int)currentViewController.pageIndex;
[self.pageControl setCurrentPage:currentIndex];
}
，并在最后执行的方法在动画上更新PageViewController
- (void)loadNextController {
currentIndex++;
PageContentViewController *nextViewController = [self viewControllerAtIndex:currentIndex];
if (nextViewController == nil) {
currentIndex = 0;
nextViewController = [self viewControllerAtIndex:currentIndex];
}
[self.pageViewController setViewControllers:@[nextViewController] direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
[self.pageControl setCurrentPage:currentIndex];
}
当前索引被全局声明以跟踪当前PageViewController的索引并相应地更新PageController。
希望它有帮助..快乐编码.. :)
请更新回答Swift 3 – Mamta 2017-06-19 16:03:11