问题描述
我正在实现一个简单的图库视图控制器，其中该应用程序显示用户可以滚动浏览的一小部分全屏图像.我使用的UIPageViewController我认为，如果实现正确的数据源功能，应自动显示页面控制"指示器.但是我仍然看不到任何指标.
I am implementing a straightforward gallery view controller where the app displays a small range of full-screen images that the user can scroll through. I'm using UIPageViewController which I thought, should display the Page Control indicators automatically if I implement the correct datasource functions. However I still cannot see any indicators.
在我的主要 GalleryViewController 中:
class GalleryViewController: UIViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {
var pageController: UIPageViewController?
var pageContent = NSArray()
override func viewDidLoad() {
super.viewDidLoad()
.... some code to load images into the pageContent array ....
pageController = UIPageViewController(transitionStyle:.Scroll, navigationOrientation:.Horizontal,options:nil)
pageController?.delegate = self
pageController?.dataSource = self
... some more standard code to add the page controller to self.view etc.
var pageControl = UIPageControl.appearance()
pageControl.pageIndicatorTintColor = UIColor.lightGray()
pageControl.currentPageIndicatorTintColor = UIColor.whiteColor()
pageControl.backgroundColor = UIColor.blackColor()
pageController!.didMoveToParentViewController(self)
}
func viewControllerAtIndex(index:Int) -> ContentViewController? {
....
}
我已经实现了两种强制性协议方法viewControllerBeforeViewController和viewControllerAfterController以及用于分页的两个必需协议:presentationCountForPagesViewController和presentationIndexForPageViewController.
I have implemented the two compulsory protocol methods viewControllerBeforeViewController and viewControllerAfterController as well as the two required ones for paging, presentationCountForPagesViewController and presentationIndexForPageViewController.
我的 ContentViewController 有一个 UIImageView ，它可以填满整个屏幕.但是，即使我减小屏幕底部的尺寸，也看不到任何页面指示灯.我在这里错过了什么吗?如果我没有提供足够的信息，请告诉我.我一直在尝试重写我5年前在Objective-C中编写的我的旧应用程序-完全在iOS 8和Xcode等的Swift中进行了更改，这令人困惑.谢谢！
My ContentViewController has a UIImageView that fills the entire screen. However even when I decrease its size off the bottom of the screen, I cannot see any page indicator lights.Have I missed something here? Let me know if I have not provided enough information. I've been trying to rewrite an old app of mine that I coded in Objective-C over 5 years ago - entirely in Swift for iOS8 and Xcode etc. has changed so much, it is confusing.Thanks!
推荐答案
来自:
func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
return pageContent.count
}
func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
return 0
}
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