2017回答..

Question

我正在尝试从故事板中特定配置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......

第一页显示页面指示符。在刷卡的时候，
我可以正确看到第二页。
转换完成后，我会看到一个黑屏（页面指示器正确显示第2页的页面）。没有用户互动已经可用。

Answer 1

2017回答..

现在很容易做到这一点只使用故事板。

这种“刷屏全屏教程”作为应用程序“介绍”很受欢迎，因此我将该课程称为IntroPages以下的课程。

步骤1，创建一个UIPageViewController的容器视图。

如果是iOS新用户，则此处为container view tutorial。

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

）

您可以将容器设置为您想要的任何形状。与任何容器视图一样，它可以是全屏或屏幕的一小部分 - 无论你想要什么。

第2步，

制作四个简单的视图控制器，可以你想要的任何东西 - 图像，文本，表格，任何东西。（示例中为紫色。）

four controllers

请注意，他们只是坐在您的故事板上，不要将它们链接到任何内容。

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

set the IDs

第4步，复制并粘贴！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: UIPageViewControllerNavigationDirection.forward, animated: false, completion: nil)
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController)-> UIViewController? {

        let cur = pages.index(of: viewController)!

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

        let prev = abs((cur - 1) % pages.count)
        return pages[prev]

    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController)-> UIViewController? {

        let cur = pages.index(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 - 根据您的喜好，可以使用循环或线性分页的代码。）

这就是它的全部 - 你已经完成了。

您只需在故事板上设置过渡样式，

你很可能想要“滚动”，而不是另一个。

Answer 2

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的这个好答案，如果您更喜欢“round and around”分页，请执行以下操作：仍然使用相同的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];
    }

Answer 3

使用private static final Service [] employeeList = new Employee [10]; private static final Scanner scanner = new Scanner(System.in); public static void main(String[] args){ // First name / Last name / Employee Number final Employee FakeEmployee0 = new Employee("Steve", "Holt", "2345"); final Employee FakeEmployee1 = new Employee("Steve", "Molt", "2111"); final Employee FakeEmployee2 = new Employee("Steve", "Sholt", "245"); final Employee FakeEmployee3 = new Employee("Steve", "Colt", "2222"); final Employee FakeEmployee4 = new Employee("Steve", "Wolt", "25"); final Employee FakeEmployee5 = new Employee("Boy", "Blue", "1"); final Employee FakeEmployee6 = new Employee("Boy", "Wonder", "8999"); final Employee FakeEmployee7 = new Employee("Boy", "George", "500"); final Employee FakeEmployee8 = new Employee("Will", "Smith", "123"); final Employee FakeEmployee9 = new Employee("Will", "Ferret", "23"); employeeList [0] = FakeEmployee0; employeeList [1] = FakeEmployee1; employeeList [2] = FakeEmployee2; employeeList [3] = FakeEmployee3; employeeList [4] = FakeEmployee4; employeeList [5] = FakeEmployee5; employeeList [6] = FakeEmployee6; employeeList [7] = FakeEmployee7; employeeList [8] = FakeEmployee8; employeeList [9] = FakeEmployee9; // Search for employees by first name: private static void searchNames(){ System.out.println("Enter employee's first name: "); String nameCheck = sc.nextLine(); for (int i = 0; i < employeeList.length; i++){ if (employeeList[i].getFirstName().startsWith(nameCheck)){ System.out.println("ID No: " + employeeList[i].getIdNum() + " - " + employeeList[i].getLastName() + " " + employeeList[i].getFirstName()); } else { System.out.println("No Matching employee records found!"); } } }类的Swift代码扩展Joe Blow's answer：

UIPageViewController

在故事板设置的using UIPageViewController with container view上阅读更多内容。

Answer 4

在Storyboard中似乎有很多关于UIPageViewController的问题。

以下是some demo code，向您展示如何在故事板中将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区域进行分页。

Answer 5

针对Swift 3进行了更新：

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
    }
}

Answer 6

要使用@samwize的答案进行无限回滚，您需要添加条件以检查负值。否则，您只需在第一页和第二页之间切换。只有在计划有两页以上时才需要这样做。

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]
    }

Answer 7

Swift 5 的答案：

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
    }
}

Answer 8

问题在于您不正确地重用UIViewController个实例：

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

我建议您使用NSMutableSet作为可重复使用的UIViewController个实例池。

在viewControllerBeforeViewController:和viewControllerBeforeViewController:中使用NSMutableSet搜索您的NSPredicate，找到UIViewController，parentViewController等于nil。如果找到一个，请将其退回。如果没有，请实例化一个新的，将其添加到NSMutableSet然后将其返回。

当你完成并且你的测试正在通过时，你可以将池提取到它自己的类中。

UIPageViewController和故事板

问题是......

8 个答案:

2017回答..