从 Swift 3 中的 UIPageViewController 中删除黑边
Posted
技术标签:
【中文标题】从 Swift 3 中的 UIPageViewController 中删除黑边【英文标题】：Remove Black Edges from UIPageViewController in Swift 3 【发布时间】：2016-09-29 20:16:25 【问题描述】：我正在使用 Swift 3.0 并创建了一个 UIPageViewController，目前有两个页面（每个页面都是一个 UIViewController）。当我运行应用程序时，一切正常，除了在显示 ViewControllers 时应用程序的底部和右侧有黑色空间。我也看不到 PageViewController 中的页面点。我已经实现了在屏幕上放置点的功能：
func pageViewController(pageViewController: PageViewController,
didUpdatePageCount count: Int)
func pageViewController(pageViewController: PageViewController,
didUpdatePageIndex index: Int)
布局
PageViewController 内部的视图控制器
PageViewController 设置
有人知道如何修复页面周围的黑色边框并添加页面点吗？
更新
import UIKit
class PageViewController: UIPageViewController
weak var pageDelegate: PageViewControllerDelegate?
private(set) lazy var orderedViewControllers: [UIViewController] =
// The view controllers will be shown in this order
return [self.newViewController(name: "view1"),
self.newViewController(name: "view2"),
self.newViewController(name: "view3"),
self.newViewController(name: "view4"),
self.newViewController(name: "view5")]
()
override func viewDidLoad()
super.viewDidLoad()
dataSource = self
delegate = self
if let initialViewController = orderedViewControllers.first
scrollToViewController(viewController: initialViewController, direction: UIPageViewControllerNavigationDirection.forward)
pageDelegate?.pageViewController(pageViewController: self, didUpdatePageCount: orderedViewControllers.count)
/**
Scrolls to the next view controller.
*/
func scrollToNextViewController()
if let visibleViewController = viewControllers?.first,
let nextViewController = pageViewController(self, viewControllerAfter: visibleViewController)
scrollToViewController(viewController: nextViewController, direction: UIPageViewControllerNavigationDirection.forward)
/**
Scrolls to the view controller at the given index. Automatically calculates
the direction.
- parameter newIndex: the new index to scroll to
*/
func scrollToViewController(index newIndex: Int)
if let firstViewController = viewControllers?.first,
let currentIndex = orderedViewControllers.index(of: firstViewController)
let direction: UIPageViewControllerNavigationDirection = newIndex >= currentIndex ? .forward : .reverse
let nextViewController = orderedViewControllers[newIndex]
scrollToViewController(viewController: nextViewController, direction: direction)
private func newViewController(name: String) -> UIViewController
return UIStoryboard(name: "Main", bundle: nil) .
instantiateViewController(withIdentifier: "\(name)ViewController")
/**
Scrolls to the given 'viewController' page.
- parameter viewController: the view controller to show.
*/
private func scrollToViewController(viewController: UIViewController,
direction: UIPageViewControllerNavigationDirection = .forward)
setViewControllers([viewController],
direction: direction,
animated: true,
completion: (finished) -> Void in
// Setting the view controller programmatically does not fire
// any delegate methods, so we have to manually notify the
// 'pageDelegate' of the new index.
self.notifyPageDelegateOfNewIndex()
)
/**
Notifies '_pageDelegate' that the current page index was updated.
*/
func notifyPageDelegateOfNewIndex()
if let firstViewController = viewControllers?.first,
let index = orderedViewControllers.index(of: firstViewController)
self.pageDelegate?.pageViewController(pageViewController: self, didUpdatePageIndex: index)
// MARK: UIPageViewControllerDataSource
extension PageViewController: UIPageViewControllerDataSource
func pageViewController(_ pageViewController: UIPageViewController,
viewControllerBefore viewController: UIViewController) -> UIViewController?
guard let viewControllerIndex = orderedViewControllers.index(of: viewController) else
return nil
let previousIndex = viewControllerIndex - 1
// User is on the first view controller and swiped left to loop to
// the last view controller.
guard previousIndex >= 0 else
return orderedViewControllers.last
guard orderedViewControllers.count > previousIndex else
return nil
return orderedViewControllers[previousIndex]
func pageViewController(_ pageViewController: UIPageViewController,
viewControllerAfter viewController: UIViewController) -> UIViewController?
guard let viewControllerIndex = orderedViewControllers.index(of: viewController) else
return nil
let nextIndex = viewControllerIndex + 1
let orderedViewControllersCount = orderedViewControllers.count
// User is on the last view controller and swiped right to loop to
// the first view controller.
guard orderedViewControllersCount != nextIndex else
return orderedViewControllers.first
guard orderedViewControllersCount > nextIndex else
return nil
return orderedViewControllers[nextIndex]
extension PageViewController: UIPageViewControllerDelegate
func pageViewController(_ pageViewController: UIPageViewController,
didFinishAnimating finished: Bool,
previousViewControllers: [UIViewController],
transitionCompleted completed: Bool)
notifyPageDelegateOfNewIndex()
protocol PageViewControllerDelegate: class
/**
Called when the number of pages is updated.
- parameter pageViewController: the PageViewController instance
- parameter count: the total number of pages.
*/
func pageViewController(pageViewController: PageViewController,
didUpdatePageCount count: Int)
/**
Called when the current index is updated.
- parameter pageViewController: the PageViewController instance
- parameter index: the index of the currently visible page.
*/
func pageViewController(pageViewController: PageViewController,
didUpdatePageIndex index: Int)
【问题讨论】：
这些图片的模式是什么？ 模式是什么意思？我在 iPhone 6S plus 上运行它 我的意思是图像视图的内容模式，在你的故事板中选择图像视图，导航到属性检查器，“模式”前面选择的是什么？ 请告诉我该图像视图的限制是什么？ 模式：缩放填充，约束为：imgur.com/a/LwbWH设置为填充整个窗口 【参考方案1】：我现在遇到了同样的问题，我刚刚通过在 viewDidLoad() 函数中将背景颜色更改为白色解决了这个问题
self.view.backgroundColor = .white
【讨论】：
以上是关于从 Swift 3 中的 UIPageViewController 中删除黑边的主要内容，如果未能解决你的问题，请参考以下文章