将UIPageViewController与Swift和多个视图控制器一起使用

  • Z时代
  • 2024-01-10
  • 分类：问答

我正在尝试UIPageViewController在具有多个视图控制器的Swift应用程序中使用。我的情节提要板（firstViewController和secondViewController）上有2个视图控制器，它们都嵌入各自的导航控制器中。它们具有情节提要标识符“

FirstViewController”和“

SecondViewController”。我在情节提要上还具有一个带有identifierPageView控制器的页面视图控制器，并将导航设置为水平和过渡样式以在属性检查器中滚动。FirstViewController是应用程序的根视图控制器

我想firstViewController成为页面视图控制器的第一页，所以我这样编写了它的类：

import Foundation
import UIKit
class FirsttViewController: UITableViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate  {
    override func viewDidLoad() {
        let pageViewController: PageViewController = self.storyboard.instantiateViewControllerWithIdentifier("PageViewController") as PageViewController
        pageViewController.delegate = self
        var viewControllers: [UIViewController] = [self]
        pageViewController.setViewControllers(viewControllers, direction: UIPageViewControllerNavigationDirection.Forward, animated: false, completion: nil)
        pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.width, self.view.frame.height)
        self.addChildViewController(pageViewController)
        self.view.addSubview(pageViewController.view)
        pageViewController.didMoveToParentViewController(self)
    }
    func pageViewController(pageViewController: UIPageViewController!, viewControllerAfterViewController viewController: UIViewController!) -> UIViewController! {
        let secondViewController: SecondViewController = self.storyboard.instantiateViewControllerWithIdentifier("SecondViewController") as SecondViewController
        return secondViewController
    }
    func pageViewController(pageViewController: UIPageViewController!, viewControllerBeforeViewController viewController: UIViewController!) -> UIViewController! {
        return nil
    }
    func presentationCountForPageViewController(pageViewController: UIPageViewController!) -> Int {
        return 2
    }
    func presentationIndexForPageViewController(pageViewController: UIPageViewController!) -> Int {
        return 0
    }
}

的文件SecondViewController如下所示：

import Foundation
import UIKit
class SecondViewController: UITableViewController, UIPageViewControllerDataSource {
    func pageViewController(pageViewController: UIPageViewController!, viewControllerAfterViewController viewController: UIViewController!) -> UIViewController! {
        return nil
    }
    func pageViewController(pageViewController: UIPageViewController!, viewControllerBeforeViewController viewController: UIViewController!) -> UIViewController! {
        let firstViewController: FirstViewController = self.storyboard.instantiateViewControllerWithIdentifier("FirstViewController") as FirstViewController
        return firstViewController
    }
}

但是，当我运行我的应用程序时，它似乎没有页面视图控制器。它只是显示firstViewController而已。没有点，没有页面等。有人知道怎么了吗？我找到了一些Objective-

C教程，但它们都涵盖了对所有页面使用一个视图控制器的问题，并且具有一个不是页面的根视图控制器，pageView因此它们并没有太多帮助。我希望它就像使用一个tabBarController您只需单击并拖动到视图控制器的按钮，但是不幸的是事实并非如此。就像我说过我以前从未与其中之一合作过，所以我有点迷路了。

回答：

根据iiFreeman的建议，我继承了子类UIPageViewController，并将其作为情节提要文件的根。下面是子类

import Foundation
import UIKit
class PageViewController: UIPageViewController {
    override func viewDidLoad() {
        let startingViewController = self.storyboard.instantiateViewControllerWithIdentifier("FirstViewController") as FirstViewController
        self.dataSource = startingViewController
        var viewControllers: [UIViewController] = [startingViewController]
        self.setViewControllers(viewControllers, direction: UIPageViewControllerNavigationDirection.Forward, animated: false, completion: nil)
    }
}

但是，现在该应用程序只是挂在黑屏上，最终Xcode失去了与模拟器的连接。我不太确定怎么回事。

回答：

好，我知道了。由于我需要页面视图控制器作为根并处理所有内容，因此我将其子类UIPageViewController化为iiFreeman建议并遵循委托和数据源协议。然后，在中设置控制器viewDidLoad，并实现委托和数据源方法。我添加了一个属性存储，其中包含一个故事板标识符数组，以及一个用于跟踪该数组当前索引的数组。我还添加了一个辅助方法，以给定索引返回正确的视图控制器。tableView因为我的页面视图控制器可以处理所有内容，所以我的其他控制器子类不需要任何东西。我意识到的一件事是，由于tableViewControllers嵌入在导航控制器中，因此我的页面视图控制器实际上需要显示导航控制器，而不是导航控件。tableView控制器。下面是我的实现：

import Foundation
import UIKit
class PageViewController: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {
    var index = 0
    var identifiers: NSArray = ["FirstNavigationController", "SecondNavigationController"]
    override func viewDidLoad() {
        self.dataSource = self
        self.delegate = self
        let startingViewController = self.viewControllerAtIndex(self.index)
        let viewControllers: NSArray = [startingViewController]
        self.setViewControllers(viewControllers, direction: UIPageViewControllerNavigationDirection.Forward, animated: false, completion: nil)
    }
    func viewControllerAtIndex(index: Int) -> UINavigationController! {
        //first view controller = firstViewControllers navigation controller
        if index == 0 {
            return self.storyboard.instantiateViewControllerWithIdentifier("FirstNavigationController") as UINavigationController
        }
        //second view controller = secondViewController's navigation controller
        if index == 1 {
            return self.storyboard.instantiateViewControllerWithIdentifier("SecondNavigationController") as UINavigationController
        }
        return nil
    }
    func pageViewController(pageViewController: UIPageViewController!, viewControllerAfterViewController viewController: UIViewController!) -> UIViewController! {
        let identifier = viewController.restorationIdentifier
        let index = self.identifiers.indexOfObject(identifier)
        //if the index is the end of the array, return nil since we dont want a view controller after the last one
        if index == identifiers.count - 1 {
            return nil
        }
        //increment the index to get the viewController after the current index
        self.index = self.index + 1
        return self.viewControllerAtIndex(self.index)
    }
    func pageViewController(pageViewController: UIPageViewController!, viewControllerBeforeViewController viewController: UIViewController!) -> UIViewController! {
        let identifier = viewController.restorationIdentifier
        let index = self.identifiers.indexOfObject(identifier)
        //if the index is 0, return nil since we dont want a view controller before the first one
        if index == 0 {
            return nil
        }
        //decrement the index to get the viewController before the current one
        self.index = self.index - 1
        return self.viewControllerAtIndex(self.index)
    }
    func presentationCountForPageViewController(pageViewController: UIPageViewController!) -> Int {
        return self.identifiers.count
    }
    func presentationIndexForPageViewController(pageViewController: UIPageViewController!) -> Int {
        return 0
    }
}

以上是 将UIPageViewController与Swift和多个视图控制器一起使用 的全部内容， 来源链接： utcz.com/qa/413398.html

回到顶部