xamarin.ios使用仅图像代码实现PageController

本文关键字：图像代码 实现 PageController ios xamarin | 更新日期: 2023-09-27 18:01:04

我正在用xamarin开发一个ios应用程序，只有代码，没有StoryBoard，也没有任何设计器。我需要实现一个包含许多图像并水平滚动的UiViewController，就像这样。

我没有找到适合我的东西。所以有人给我一些建议或例子吗？

xamarin.ios使用仅图像代码实现PageController

似乎您需要一个没有故事板或.xib.的UIPageViewController

你需要3个自定义类来实现它

  1. MyPageViewController-自定义UIPageViewController

    public class MyPageViewController : UIPageViewController
{
    private List<ContentViewController> pages = new List<ContentViewController>();
    public MyPageViewController() : base(UIPageViewControllerTransitionStyle.Scroll, UIPageViewControllerNavigationOrientation.Horizontal)
    {
        View.Frame = UIScreen.MainScreen.Bounds;
        pages.Add(new ContentViewController(0,UIColor.Red));
        pages.Add(new ContentViewController(1,UIColor.Green));
        pages.Add(new ContentViewController(2,UIColor.Blue));
        DataSource = new PageDataSource(pages);
        SetViewControllers(new UIViewController[] { pages [0] as UIViewController }, UIPageViewControllerNavigationDirection.Forward, false, null);
    }
}

  2. PageDataSource:

    public class PageDataSource : UIPageViewControllerDataSource
{
    List<ContentViewController> pages; 
    public PageDataSource(List<ContentViewController> pages)
    {
        this.pages = pages;
    }
    override public UIViewController GetPreviousViewController(UIPageViewController pageViewController, UIViewController referenceViewController)
    {
        ContentViewController currentPage = referenceViewController as ContentViewController;
        ContentViewController pageToReturn = null;
        if (currentPage.Index == 0)
        {
            pageToReturn = pages[pages.Count - 1];
        }
        else
        {
            pageToReturn = pages[currentPage.Index - 1];
        }
        // NOTE: If the same view controller is returned, UIPageViewController will break and show black screen
        return pageToReturn != currentPage ? pageToReturn : null; 
    }
    override public UIViewController GetNextViewController(UIPageViewController pageViewController, UIViewController referenceViewController)
    {
        ContentViewController currentPage = referenceViewController as ContentViewController;
        ContentViewController pageToReturn = pages[(currentPage.Index + 1) % pages.Count];
        return pageToReturn != currentPage ? pageToReturn : null;
    }
}

  3. ContentViewController-自定义UIViewController，只需添加属性Index

    public class ContentViewController : UIViewController
{
    private int index = -1;
    public int Index
    {
        get
        { 
            return index;
        }
    }
    public ContentViewController(int _index, UIColor backColor)
    {
        this.index = _index;
        this.View.Frame = UIScreen.MainScreen.Bounds;
        this.View.BackgroundColor = backColor;
    }
}

最后，覆盖AppDelegate.cs:中的FinishedLaunching方法

public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
{
    this.Window = new UIWindow(UIScreen.MainScreen.Bounds);
    this.Window.RootViewController = new MyPageViewController();
    this.Window.MakeKeyAndVisible();
    return true;
}

希望它能帮助你。

如果你还有一些问题，就把它留在这里。

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