PageControll 页面 swift 4 的错误号
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【中文标题】PageControll 页面 swift 4 的错误号【英文标题】：PageControll error number of page swift 4 【发布时间】：2018-06-28 09:33:57 【问题描述】：我创建了一个包含 3 个页面的 PageController .. 我分配并声明了所有内容，我实现了两个允许滚动视图的功能，同时我输入了命令以启用控制器并报告了正确的页面。结果是，如果我流动我的页面一切正常，而在页面计数器下按他的意愿工作.. 我不明白出了什么问题
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import UIKit
import AVFoundation
protocol IntroNavigationDelegate: class
func showNextViewController()
func showPreviousViewController()
var isPagingEnabled: Bool get set
final class IntroViewController: UIPageViewController, UIPageViewControllerDelegate, IntroNavigationDelegate, UIPageViewControllerDataSource
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController?
if let viewControllerIndex = self.displayedControllers.index(of: viewController)
if viewControllerIndex == 0
else if viewControllerIndex == 1
return self.displayedControllers[viewControllerIndex - 1]
return nil
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController?
if let viewControllerIndex = self.displayedControllers.index(of: viewController)
if viewControllerIndex < self.displayedControllers.count - 1
self.pageControl.currentPage = 1
return self.displayedControllers[viewControllerIndex + 1]
else
self.pageControl.currentPage = 0
return nil
var introRouter: IntroRouter?
var pageControl = UIPageControl()
var displayedControllers: [UIViewController] = []
private var scrollView: UIScrollView?
for view in view.subviews
if let subView = view as? UIScrollView
return subView
return nil
var isPagingEnabled: Bool
get
return scrollView?.isScrollEnabled ?? true
set
scrollView?.isScrollEnabled = newValue
override func viewDidLoad()
super.viewDidLoad()
configurePageControl()
setupUI()
self.pageControl.updateCurrentPageDisplay()
arrangeSubviews()
self.delegate = self
override func viewWillAppear(_ animated: Bool)
self.navigationController?.setNavigationBarHidden(true, animated: animated)
override func viewWillDisappear(_ animated: Bool)
super.viewWillDisappear(animated)
navigationController?.isNavigationBarHidden = false
func setDiplayedControllers(_ controllers: [UIViewController], visualizedController: UIViewController)
displayedControllers = controllers
setViewControllers([visualizedController], direction: .forward, animated: false, completion: nil)
func showNextViewController()
if let current = viewControllers?.first, let next = IntroViewController(self, viewControllerAfter: current)
setViewControllers([next], direction: .forward, animated: true, completion: nil)
func showPreviousViewController()
if let current = viewControllers?.first, let previous = IntroViewController(self, viewControllerBefore: current)
setViewControllers([previous], direction: .reverse, animated: true, completion: nil)
func configurePageControl()
self.pageControl.frame = CGRect()
self.pageControl.numberOfPages = self.displayedControllers.count
self.pageControl.translatesAutoresizingMaskIntoConstraints = false
self.pageControl.updateCurrentPageDisplay()
self.view.addSubview(self.pageControl)
pageControl.activate([
pageControl.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: -20),
pageControl.heightAnchor.constraint(equalTo: self.view.heightAnchor, multiplier: 0.1),
pageControl.widthAnchor.constraint(equalTo: self.view.widthAnchor, multiplier: 1),
])
override init(transitionStyle style: UIPageViewControllerTransitionStyle, navigationOrientation: UIPageViewControllerNavigationOrientation, options: [String : Any]? = nil)
super.init(transitionStyle: style, navigationOrientation: navigationOrientation, options: options)
setup()
func setRouter(introRouter: IntroRouter)
self.introRouter = introRouter
required init?(coder aDecoder: NSCoder)
fatalError("init(coder:) has not been implemented")
private func setup()
view.backgroundColor = .white
dataSource = self
private extension IntroViewController
func IntroViewController(_ IntroViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController?
if let viewControllerIndex = self.displayedControllers.index(of: viewController)
if viewControllerIndex == 0
// wrap to last page in array
return self.displayedControllers.last
else
// go to previous page in array
return self.displayedControllers[viewControllerIndex + 1]
return nil
func IntroViewController(_ IntroViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController?
self.pageControl.updateCurrentPageDisplay()
if let viewControllerIndex = self.displayedControllers.index(of: viewController)
if viewControllerIndex < self.displayedControllers.count - 1
// go to next page in array
self.pageControl.currentPage = viewControllerIndex
return self.displayedControllers[viewControllerIndex + 1]
else
// wrap to first page in array
self.pageControl.currentPage = viewControllerIndex
return self.displayedControllers.first
return nil
func IntroViewController(_ IntroViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool)
// set the pageControl.currentPage to the index of the current viewController in pages
if let viewControllers = IntroViewController.viewControllers
if let viewControllerIndex = self.displayedControllers.index(of: viewControllers[0])
self.pageControl.currentPage = viewControllerIndex
self.pageControl.updateCurrentPageDisplay()
func setupUI()
configurePageControl()
pageControl.do
$0.numberOfPages = 3
// $0.currentPage = 0
$0.pageIndicatorTintColor = .lightGray
$0.currentPageIndicatorTintColor = Theme.Colors.white
$0.currentPage = self.displayedControllers.count
func arrangeSubviews()
view.addSubview(pageControl)
【问题讨论】：
【参考方案1】：试试下面的代码。这会很有帮助。
class PageViewModel: NSObject
private var timer: Timer?
private var interval: Double?
var enableAutoScroll: Bool = false
didSet
self.toggleTimer()
var viewControllers: [UIViewController]
var currentIndex: Int = 0
var direction: UIPageViewControllerNavigationDirection = .forward
init(viewControllers: [UIViewController])
self.viewControllers = viewControllers
super.init()
override convenience init()
self.init(viewControllers: [])
private func stopTimer()
if self.timer != nil
timer?.invalidate()
timer = nil
return
private func startTimer()
if self.timer != nil
return
if #available(ios 10.0, *)
if let time = interval
timer = Timer.scheduledTimer(withTimeInterval: time, repeats: true, block: (timer: Timer) in
self.timerFire()
)
else
// Fallback on earlier versions
if let time = interval
timer = Timer.scheduledTimer(timeInterval: time, target: self, selector: #selector(PageViewModel.timerFire), userInfo: nil, repeats: true)
@objc private func timerFire()
if direction == .forward
var index = currentIndex
if index < self.viewControllers.count - 1
index += 1
else
index = 0
currentIndex = index
scrollToNextPage?(currentIndex)
pageNumberChangedObserver?(currentIndex)
else
var index = currentIndex
if index <= 0
index = (self.viewControllers.count - 1)
else
index -= 1
currentIndex = index
scrollToNextPage?(index)
pageNumberChangedObserver?(currentIndex)
// MARK: - Timer
func toggleTimer()
if enableAutoScroll == true
startTimer()
else
stopTimer()
fileprivate var scrollToNextPage: ((_ index: Int) -> Void)?
func scrollToNextPage(callBack: @escaping (_ index: Int) -> Void)
scrollToNextPage = callBack
// MARK: - PageNumberChangedObserver
fileprivate var pageNumberChangedObserver: ((_ index: Int) -> Void)?
func pageNumberChanged(callBack: @escaping (_ index: Int) -> Void)
pageNumberChangedObserver = callBack
// MARK: - UIPageViewControllerDataSource
extension PageViewModel: UIPageViewControllerDataSource
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController?
guard let viewControllerIndex = viewControllers.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
// Uncommment the line below, remove the line above if you don't want the page control to loop.
return nil
guard viewControllers.count > previousIndex else
return nil
return viewControllers[previousIndex]
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController?
guard let viewControllerIndex = viewControllers.index(of: viewController) else
return nil
let nextIndex = viewControllerIndex + 1
let orderedViewControllersCount = viewControllers.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
// Uncommment the line below, remove the line above if you don't want the page control to loop.
return nil
guard orderedViewControllersCount > nextIndex else
return nil
return viewControllers[nextIndex]
// MARK: - UIPageViewControllerDelegate
extension PageViewModel: UIPageViewControllerDelegate
func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool)
if let pageContentViewController = pageViewController.viewControllers?[0]
if let index = viewControllers.index(of: pageContentViewController)
currentIndex = index
pageNumberChangedObserver?(currentIndex)
在您的容器视图控制器中编写以下代码：-
// set current page to the page controller
func setNextPage(index: Int, direction: UIPageViewControllerNavigationDirection)
if let firstViewController = pageViewModel?.viewControllers[selectedCategoryCell]
pageViewController?.setViewControllers([firstViewController],
direction: direction,
animated: true,
completion: nil)
// MARK: - SET PAGE CONTROLLER's VIEW's
private func setupPageViewController()
let pageViewController: UIPageViewController = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: nil)
pageViewController.dataSource = pageViewModel
pageViewController.delegate = pageViewModel
if let firstViewController = pageViewModel?.viewControllers[selectedCategoryCell]
pageViewController.setViewControllers([firstViewController],
direction: .forward,
animated: true,
completion: nil)
for recognizer in pageViewController.gestureRecognizers
if recognizer is UITapGestureRecognizer
recognizer.isEnabled = false
self.addChildViewController(pageViewController)
self.containerView.addSubview(pageViewController.view)
var pageViewRect = self.containerView.bounds
if UIDevice.current.userInterfaceIdiom == .pad
pageViewRect = pageViewRect.insetBy(dx: 40.0, dy: 40.0)
pageViewController.view.frame = pageViewRect
pageViewController.didMove(toParentViewController: self)
self.pageViewController = pageViewController
// set the selected page and accordingly set the above collection view ( that is treatment option's collection view)
func pageNumberChanged(index: Int)
self.selectedCategoryCell = index
// MARK: Init View Controller for Page Controller
func initViewController(index: Int) -> UIViewController
guard let itemsViewController = self.storyboard?.instantiateViewController(withIdentifier: "MatchesV2ViewController") as? MatchesV2ViewController else
fatalError("Items View Controller Not Found")
itemsViewController.delegate = self
itemsViewController.currentMatch = matches.user[index]
return itemsViewController
// MARK: Setting VC In Page View Controller
func instantiateViewControllers()
matchesScreen.removeAll()
for i in 0..<matches.user.count
matchesScreen.append(initViewController(index: i))
pageViewModel = PageViewModel(viewControllers: matchesScreen)
pageViewModel?.pageNumberChanged(callBack: (index: Int) in
self.pageNumberChanged(index: index)
)
pageViewModel?.scrollToNextPage(callBack: (index: Int) in
self.setNextPage(index: index, direction: .forward)
)
if matchesScreen.count > 0
self.setupPageViewController()
【讨论】：
我只需要管理页面控制器的部分，我不想重做所有事情.. 其余的都在工作 我认为这是处理 UIPageController 的完美方式。 我写的代码我应该删除什么来使用你的？ 我的代码分为两部分。第一部分只需在 Pageview.Swift 中编写，其中包含 UIPageController 委托和数据源的处理。就像 UITableViewDelegate 和 dataSource 一样。第二部分包含如何使用该功能。比如将 DataSource 设置为 UIPageController，移动 Next PageController以上是关于PageControll 页面 swift 4 的错误号的主要内容，如果未能解决你的问题，请参考以下文章
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