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UIPageViewController和情节提要

xcode-storyboard uipageviewcontroller uistoryboard ios

Benjamin Toueg · 技术社区 · 11 年前

我正在尝试从情节提要中专门配置UIPageViewController:

enter image description here

TutorialPageViewController.h

#import <UIKit/UIKit.h>
@interface TutorialPageViewController : UIPageViewController <UIPageViewControllerDelegate, UIPageViewControllerDataSource>
@end

TutorialPageViewController.m

#import "TutorialPageViewController.h"

@interface TutorialPageViewController ()
@property (assign, nonatomic) NSInteger index;
@end

@implementation TutorialPageViewController
{
    NSArray *myViewControllers;
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.delegate = self;
    self.dataSource = self;
    [self didMoveToParentViewController:self];
    UIStoryboard *tutorialStoryboard = [UIStoryboard storyboardWithName:@"TutorialStoryboard" bundle:[NSBundle mainBundle]];
    UIViewController *tuto1 = [tutorialStoryboard instantiateViewControllerWithIdentifier:@"TutorialPageViewController_1"];
    UIViewController *tuto2 = [tutorialStoryboard instantiateViewControllerWithIdentifier:@"TutorialPageViewController_2"];

    myViewControllers = @[tuto1, tuto2, tuto1, tuto2];
    self.index = 0;

    [self setViewControllers:@[tuto1] direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
}

- (UIViewController *)viewControllerAtIndex:(NSUInteger)index {
    return myViewControllers[index];
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {

    NSUInteger index = self.index;

    if (index == 0) { return nil; }

    // Decrease the index by 1 to return
    index--;
    return [self viewControllerAtIndex:index];
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {

    NSUInteger index = self.index;
    index++;
    if (index > [myViewControllers count]) { return nil; }

    return [self viewControllerAtIndex:index];
}

- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController {
    // The number of items reflected in the page indicator.
    return [myViewControllers count];
}

- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController {
    // The selected item reflected in the page indicator.
    return 0;
}

@end

问题是。。。

第一个页面与页面指示器一起显示得很好。在滑动的同时,
我能正确地看到第二页。
转换一结束,我就会看到一个黑屏(页面指示器正确显示第2页)。无用户交互不再可用。

8 回复 | 直到 8 年前

Fattie 1 年前

2023.Swift更新。

2017答案。。。

现在做这件事很容易 简单地使用情节提要 .

这些“刷屏全屏教程”作为应用程序的“简介”流行了一段时间,所以我给下面的课打了电话 IntroPages .

步骤1,制作 容器视图 即UIPageViewController。

如果是iOS新手,这里有 container view tutorial .

(注意:如果您不知道如何将容器视图“更改”为UIPageViewController,请向下滚动到该部分 “如何改变…” 在那个教程上!

)

你可以制作容器 你想要什么形状 。与任何容器视图一样,它可以是全屏视图,也可以是屏幕的一小部分,无论您想要什么。

步骤2,

制作四个简单、普通的视图控制器,它们可以 你想要什么 -图像、文本、表格,任何东西。(示例中为紫色。)

four controllers

请注意,它们只是 坐在你的故事板上 ,不要将它们与任何内容联系起来。

第三步,你必须 设置ID 这四页中的一页。“id1”、“id2”、“id3”和“id4”都可以。

set the IDs

第四步,复制粘贴!这是课程简介页面,

import UIKit
class IntroPages: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {

    // ** see note below about ".scroll" mode

    var pages = [UIViewController]()

    override func viewDidLoad() {
        super.viewDidLoad()
        self.delegate = self
        self.dataSource = self

        let p1: UIViewController! = storyboard?.instantiateViewController(withIdentifier: "id1")
        let p2: UIViewController! = storyboard?.instantiateViewController(withIdentifier: "id2")
        let p3: UIViewController! = storyboard?.instantiateViewController(withIdentifier: "id3")

        // etc ...

        pages.append(p1)
        pages.append(p2)
        pages.append(p3)

        // etc ...

        setViewControllers([p1], direction: UIPageViewController.NavigationDirection.forward, animated: false, completion: nil)
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController)-> UIViewController? {
       
        let cur = pages.firstIndex(of: viewController)!

        // if you prefer to NOT scroll circularly, simply add here:
        // if cur == 0 { return nil }

        var prev = (cur - 1) % pages.count
        if prev < 0 {
            prev = pages.count - 1
        }
        return pages[prev]
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController)-> UIViewController? {
         
        let cur = pages.firstIndex(of: viewController)!

        // if you prefer to NOT scroll circularly, simply add here:
        // if cur == (pages.count - 1) { return nil }

        let nxt = abs((cur + 1) % pages.count)
        return pages[nxt]
    }

    func presentationIndex(for pageViewController: UIPageViewController)-> Int {
        return pages.count
    }
}

(看看评论-有代码循环或 线性的 根据您的喜好进行分页。)

在情节提要上,查看UIPageViewController。将类设置为 简介页面 .

这就是一切——你完了。

你只需在故事板上设置过渡样式,

很可能你想要的是“滚动”,而不是另一个。

关于使用正常、常用、“.roll”模式的重要注意事项。。。

令人难以置信的是,奇怪的是,苹果已经从Xcode故事板中IB的下拉菜单中删除了正常的“.roll”选项。

(在故事板上,它们只允许你选择奇怪的选项,比如“卷曲”,从来没有人使用过。)

现在您必须在代码中完成这一操作,这很简单。添加这一行:

class IntroPages: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {

   required init?(coder: NSCoder) {
       super.init(transitionStyle: .scroll, navigationOrientation: .horizontal, options: nil)
   }

   etc, as above ... var pages = [UIViewController]()

这很傻,但事情就是这样( More info .)

你完了!现在。。。

添加UIPageControl简介。。。

您添加 UIPageControl 在最高级别的包装器类中,上图示例中的“Intro”。

(所以,令人惊讶不在页面视图控制器中,而不是在“IntroPages”中。)

因此,在故事板上,非常简单地拖动 分页控件 转到“简介”。

笔记奇怪的是,在故事板中, 无法移动UIPageControl .

当您将页面控件拖到视图控制器上时,它只是位于一个固定的位置。这很奇怪,但事实就是这样。不要浪费时间试图移动它:)

通过Intro,您需要以通常的方式访问页面视图控制器(IntroPages):

class Intro: UIViewController {

    @IBOutlet var pageControl: UIPageControl!
    var pageViewController: IntroPages!
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "segueIntroPages" {
            // if new to container views, identifier explained here:
            // https://stackoverflow.com/a/23403979/294884
            pageViewController = (segue.destination as! IntroPages)
        }
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        view.bringSubviewToFront(pageControl)
        pageControl.currentPage = 0
    }

注意这一关键行:

    view.bringSubviewToFront(pageControl)

添加此功能

@IBAction func userDidChangePageControl(_ sender: UIPageControl) {}

然后在情节提要中单击页面控件并拖动 值已更改 对该功能。

这个 最简单的大纲版本 函数的

@IBAction func userDidChangePageControl(_ sender: UIPageControl) {
    let newIndex = sender.currentPage
    pageViewController.setViewControllers(
        [pageViewController.pages[newIndex]],
        direction: (pageViewController.currentIndex < newIndex)
                     ? .forward : .reverse,
        animated: true, completion: nil)
}

然而看见 本QA https://stackoverflow.com/questions/66545624 以便对此进行更全面的调查。

在IntroPages中添加属性。。。

var currentIndex: Int {
    if let visibleViewController = viewControllers?.first,
       let ci = pages.firstIndex(of: visibleViewController) {
        return ci
    }
    else {
        return 0
    }
}

在IntroPages中还添加了以下内容,这样,当用户滑动屏幕时,UIPageControl就知道该怎么做:

func pageViewController(_ pageViewController: UIPageViewController, 
       didFinishAnimating finished: Bool,
       previousViewControllers: [UIViewController], 
       transitionCompleted completed: Bool) {
    (parent as? Intro)?.pageControl.currentPage = currentIndex
}

在IntroPages中,由于Apple错误/异常行为,还添加了以下内容:

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    let subViews = view.subviews
    var scrollView: UIScrollView? = nil
    var pageControl: UIPageControl? = nil
    
    // maintain this code order...
    for view in subViews {
        if view.isKind(of: UIScrollView.self) {
            scrollView = view as? UIScrollView
        }
        else if view.isKind(of: UIPageControl.self) {
            pageControl = view as? UIPageControl
        }
    }
    
    // maintain this code order...
    if (scrollView != nil && pageControl != nil) {
        scrollView?.frame = view.bounds
        if let pageControl = pageControl {
                    view.bringSubviewToFront(pageControl) }
    }
}

你在路上。

Fattie 10 年前

对于希望看到工作页面滚动(向前/向后)的用户

-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController
     viewControllerBeforeViewController:(UIViewController *)viewController
  {
     NSUInteger currentIndex = [myViewControllers indexOfObject:viewController];
     // get the index of the current view controller on display

     if (currentIndex > 0)
     {
        return [myViewControllers objectAtIndex:currentIndex-1];
        // return the previous viewcontroller
     } else
     {
         return nil;
         // do nothing
     }
  }
-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController
 viewControllerAfterViewController:(UIViewController *)viewController
  {
     NSUInteger currentIndex = [myViewControllers indexOfObject:viewController];
     // get the index of the current view controller on display
     // check if we are at the end and decide if we need to present
     // the next viewcontroller
     if (currentIndex < [myViewControllers count]-1)
     {
        return [myViewControllers objectAtIndex:currentIndex+1];
        // return the next view controller
     } else
     {
        return nil;
        // do nothing
     }
  }

为了补充EditOR的这个好答案,如果你喜欢“循环”分页,下面是你要做的:仍然使用与EditOR相同的技术

-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController
        viewControllerBeforeViewController:(UIViewController *)viewController
    {
    NSUInteger currentIndex = [myViewControllers indexOfObject:viewController];

    --currentIndex;
    currentIndex = currentIndex % (myViewControllers.count);
    return [myViewControllers objectAtIndex:currentIndex];
    }

-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController
        viewControllerAfterViewController:(UIViewController *)viewController
    {
    NSUInteger currentIndex = [myViewControllers indexOfObject:viewController];

    ++currentIndex;
    currentIndex = currentIndex % (myViewControllers.count);
    return [myViewControllers objectAtIndex:currentIndex];
    }

Community CDub 7 年前

延伸 Joe Blow's answer 带有Swift代码 UIPageViewController 类别:

import UIKit

class MyPageViewController: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {

    var pages = [UIViewController]()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.delegate = self
        self.dataSource = self

        let page1: UIViewController! = storyboard?.instantiateViewControllerWithIdentifier("page1")
        let page2: UIViewController! = storyboard?.instantiateViewControllerWithIdentifier("page2")

        pages.append(page1)
        pages.append(page2)

        setViewControllers([page1], direction: UIPageViewControllerNavigationDirection.Forward, animated: false, completion: nil)
    }

    func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
        let currentIndex = pages.indexOf(viewController)!
        let previousIndex = abs((currentIndex - 1) % pages.count)
        return pages[previousIndex]
    }

    func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
        let currentIndex = pages.indexOf(viewController)!
        let nextIndex = abs((currentIndex + 1) % pages.count)
        return pages[nextIndex]
    }

    func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
        return pages.count
    }

    func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
        return 0
    }
}

在上阅读更多信息 using UIPageViewController with container view 带有故事板设置。

Travis M. 8 年前

故事板中似乎有很多关于UIPageViewController的问题。

这是 some demo code 向您展示如何将故事板中的UIPageViewController用作独立的全屏视图或UIContainerView(如果您只想分页屏幕的一小部分)。

PLJNS 8 年前

针对Swift 3更新:

class YourPageViewController: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {

    var pages = [UIViewController]()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.delegate = self
        self.dataSource = self

        let page1: UIViewController! = storyboard?.instantiateViewController(withIdentifier: "page1")
        let page2: UIViewController! = storyboard?.instantiateViewController(withIdentifier: "page2")

        pages.append(page1)
        pages.append(page2)

        setViewControllers([page1], direction: UIPageViewControllerNavigationDirection.forward, animated: false, completion: nil)
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
        let currentIndex = pages.index(of: viewController)!
        let previousIndex = abs((currentIndex - 1) % pages.count)
        return pages[previousIndex]
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
        let currentIndex = pages.index(of: viewController)!
        let nextIndex = abs((currentIndex + 1) % pages.count)
        return pages[nextIndex]
    }

    func presentationIndex(for pageViewController: UIPageViewController) -> Int {
        return pages.count
    }
}

Aquila Sagitta 8 年前

要使用@samwize的答案进行无限滚动,您需要添加条件来检查负值。否则,您只需在第一页和第二页之间切换即可。只有当你打算写两页以上的时候,这才是必要的。

func pageViewController(_ pageViewController: UIPageViewController,
                            viewControllerBefore viewController: UIViewController) -> UIViewController? {
        let currentIndex = pages.index(of: viewController)!
        var previousIndex = (currentIndex - 1) % pages.count
        if previousIndex < 0 {previousIndex = pages.count - 1}
        return pages[previousIndex]
    }

-1

Rudolf AdamkoviÄ 11 年前

问题是你的重复使用不当 UIViewController 实例:

myViewControllers = @[tuto1, tuto2, tuto1, tuto2];

我建议你喝一杯 NSMutableSet 这将成为一个可重复使用的池 UI视图控制器 实例。

在里面 viewControllerBeforeViewController: 和 视图控制器前面的视图控制器: 搜索您的 NS可变集 使用 NSPredicate 查找 UI视图控制器 具有 parentViewController 等于 nil 。如果找到一个,则返回它。如果没有,则实例化一个新的,将其添加到 NS可变集 然后返回。

完成测试并通过测试后,可以将池提取到自己的类中。

-1

jrc 5 年前

回答 斯威夫特5 :

import UIKit

class MyPageViewController: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {

    var allViewControllers = [UIViewController]()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.dataSource = self

        let vc1: UIViewController! = storyboard?.instantiateViewController(withIdentifier: "viewController1")
        let vc2: UIViewController! = storyboard?.instantiateViewController(withIdentifier: "viewController2")
        allViewControllers = [vc1, vc2]

        self.setViewControllers([vc1], direction: UIPageViewController.NavigationDirection.forward, animated: false)
    }

    // UIPageViewControllerDataSource

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController?
    {
        let currentIndex = allViewControllers.firstIndex(of: viewController)!
        return currentIndex == 0 ? nil : allViewControllers[currentIndex-1]
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController?
    {
        let currentIndex = allViewControllers.firstIndex(of: viewController)!
        return currentIndex == allViewControllers.count-1 ? nil : allViewControllers[currentIndex+1]
    }

    func presentationCount(for pageViewController: UIPageViewController) -> Int
    {
      return allViewControllers.count
    }

    func presentationIndex(for pageViewController: UIPageViewController) -> Int
    {
        return 0
    }
}