UIPageViewController和情节提要

2020/12/09 07:11 · ios ·  · 0评论

我正在尝试从情节提要中专门配置UIPageViewController:

在此处输入图片说明

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...

  • 第一页与页面指示器一起显示良好。刷卡时
  • 我可以正确看到第二页。
  • 过渡完成后,我会出现黑屏(页面指示器正确显示第2页)。不再有用户交互。

2020年。Swift更新。

2017年答案...

如今,仅使用Storyboard做到这一点已经非常容易

这类“滑动全屏教程”在一段时间内作为应用程序“ intros”而流行,因此我将其称为以下类IntroPages

步骤1,制作一个容器视图,它是一个UIPageViewController。

如果不是iOS的新手,这是一个容器视图教程

(注意:如果您不知道如何将容器视图更改为UIPageViewController,请向下滚动至该教程的“如何更改...”部分

在此处输入图片说明

您可以将容器制成所需的任何形状与任何容器视图一样,它可以是全屏显示,也可以是屏幕的一小部分-无论您想要什么。

第2步,

制作四个简单的视图控制器,这些控制器可以是您想要的任何东西-图像,文本,表格等任何东西。(示例中为紫色。)

四个控制器

请注意,它们只是坐在您的故事板上,请勿将它们链接到任何东西。

步骤3,您必须设置这四个页面的ID“ id1”,“ id2”,“ id4”,“ id4”很好。

设置ID

步骤4,复制并贴上!这是IntroPages类,

class IntroPages: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {

    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
    }
}

(查看注释-您可以根据需要提供用于循环或线性分页的代码。)

这就是全部-您已完成。

您只需在情节提要板上设置过渡样式,

在此处输入图片说明

您很有可能想要“滚动”,而不是另一个。

对于想要查看工作页面滚动(向前/向后)的人

-(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
     }
  }

只是为了添加EditOR的出色答案,如果您更喜欢“四处走动”分页,可以按照以下步骤操作:仍使用相同的EditOR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];
    } 

使用该类的Swift代码扩展Joe Blow的答案UIPageViewController

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
    }
}

阅读有关将UIPageViewController与带有故事板设置的容器视图一起使用的更多信息

关于Storyboard中的UIPageViewController似乎有很多问题。

这是一些演示代码,向您展示如何在情节提要中将UIPageViewController用作独立的全屏视图或UIContainerView(如果您只想在屏幕的一小部分页面上使用)。

在此处输入图片说明
在此处输入图片说明
在此处输入图片说明

为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
    }
}

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。仅当您计划有两个以上的页面时才需要这样做。

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]
    }

问题是您不正确地重用了UIViewController实例:

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

我建议您使用一个NSMutableSet可重用UIViewController实例

viewControllerBeforeViewController:viewControllerBeforeViewController:搜索您NSMutableSet使用NSPredicate找到一个UIViewController具有parentViewController相等nil如果找到一个,将其退回。如果不是,请实例化一个新对象,将其添加到中NSMutableSet,然后将其返回。

完成并通过测试后,可以将池提取到其自己的类中。

回答Swift 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
    }
}
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