是否可以在UIPageViewController中以编程方式翻页？
是否可以在UIPageViewController中以编程方式翻页？
提问于 2011-08-27 02:10:39
是否可以在UIPageViewController中以编程方式翻页
回答 8
Stack Overflow用户
回答已采纳
发布于 2011-08-30 16:45:32
是的，使用该方法是可能的：
- (void)setViewControllers:(NSArray *)viewControllers
direction:(UIPageViewControllerNavigationDirection)direction
animated:(BOOL)animated
completion:(void (^)(BOOL finished))completion;`这与在页面上设置第一个视图控制器所使用的方法相同。与此类似，您也可以使用它来转到其他页面。
想知道为什么viewControllers是一个数组，而不是一个单一的视图控制器？
这是因为页面视图控制器可以有一个“主干”(就像在iBooks中一样)，一次显示两个页面的内容。如果一次显示一页内容，那么只需传入一个包含1个元素的数组。
Swift中的一个示例：
pageContainer.setViewControllers([displayThisViewController], direction: .Forward, animated: true, completion: nil)Stack Overflow用户
发布于 2017-03-30 08:07:04
我可能在这里完全遗漏了一些东西，但这个解决方案似乎比许多其他建议的解决方案简单得多。
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)
}
}
}
}Stack Overflow用户
发布于 2011-12-30 18:11:39
这段代码对我来说运行得很好，谢谢。
这就是我用它做的。一些方法用于前进或后退，另一种方法用于直接转到特定页面。它适用于纵向视图中的6页文档。如果您将其粘贴到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];
}
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原文链接：
https://stackoverflow.com/questions/7208871
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