如何在没有故事板的情况下在 iOS 中使用 MvvmCross? [英] How to use MvvmCross without storyboards in iOS?

问题描述

当我使用 MvvmCross 5 时，我编写了我所有的视图，并通过在我的 AppDelegate 中编写它来避免在我的 iOS 应用程序中使用故事板:

When I was using MvvmCross 5, I coded all my views and avoided using storyboards for my iOS app by writing this in my AppDelegate:

[Register("AppDelegate")]
public class AppDelegate : MvxApplicationDelegate
{
    private MvxIosViewPresenter viewPresenter;

    public override UIWindow Window
    {
        get;
        set;
    }

    /// <summary>
    /// MvvmCross Mods:
    /// - Creates a new presenter, which determines how Views are shown
    /// - This example uses a standard presenter.
    /// </summary>
    /// <param name="application"></param>
    /// <param name="launchOptions"></param>
    /// <returns></returns>
    public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
    {
        // create a new window instance based on the screen size
        Window = new UIWindow(UIScreen.MainScreen.Bounds);

        // MvvmCross Mod Start---------------------------------------------

        // This class will determine how Views are shown
        this.viewPresenter = new MvxIosViewPresenter(this, Window);//new ViewPresenter(Window);

        // Init the Setup object, which initializes App.cs
        var setup = new Setup(this, this.viewPresenter);
        setup.Initialize();

        //this.viewPresenter.PresentModalViewController(new ListenViewController(), true);

        // Use IoC to find and start the IMvxAppStart object
        var startup = Mvx.Resolve<IMvxAppStart>();
        startup.Start();

        // MvvmCross Mod End--------------------------------------------------

        // make the window visible
        Window.MakeKeyAndVisible();

        return true;
    }

public class Setup : MvxIosSetup
{
    public Setup(MvxApplicationDelegate appDelegate, IMvxIosViewPresenter presenter)
        : base(appDelegate, presenter)
    {
    }

    protected override IMvxApplication CreateApp()
    {
        return new Core.App();
    }

    protected override IMvxTrace CreateDebugTrace()
    {
        return new DebugTrace();
    }
}

但是在 MvvmCross 6.4.2 中，MvxIosSetup 没有接受 2 个参数的基本构造函数.相反，我有:

But in MvvmCross 6.4.2, MvxIosSetup does not have the base constructor that takes 2 arguments. Instead I have:

[Register(nameof(AppDelegate))]
public partial class AppDelegate : MvxApplicationDelegate<Setup, App>
{
}

public class Setup : MvxIosSetup<App>
{
}

如何配置它以便我可以在没有故事板的情况下对视图进行编码?

How can I configure it so that I can code my views without storyboards?

编辑

我使用 MvvmCross 7 创建了一个非常小的示例应用程序，其中包含 1 个视图模型/控制器.ViewDidLoad 方法从未在我的 MainViewController 中被调用.有人可以告诉我为什么吗?我把我的代码放在这里:

I created a very small sample app with 1 view model/controller, using MvvmCross 7. The ViewDidLoad method never gets called in my MainViewController. Can someone please tell me why? I put my code here:

https://github.com/sinight95/TestApp/tree/main/TestApp

推荐答案

Setup.cs 和 AppDelegate.cs 文件都与您是否呈现故事板无关.通常取决于您将哪些 Presentation Attributes 应用于 ViewController.

Neither the Setup.cs nor AppDelegate.cs files have anything to do whether you are presenting a storyboard or not. It is usually all up to which Presentation Attributes you are applying to a ViewController.

但是，Info.plist 中设置的一些内容会改变 MvvmCross 期望的设置方式.

However, there are some stuff set in the Info.plist that changes how MvvmCross expects things to be set up.

现在在 GitHub 上的示例应用程序中，您可以执行以下操作以使其不使用故事板:

Now in your example App you've put up on GitHub, you can do the following to make it not use the storyboard:

1. 删除Main.storyboard
2. 在 Info.plist 中将 Main interface 设置为 (none)
3. 在 Info.plist 中将启动图像设置为 LaunchScreen.storyboard
4. 移除 Info.plist 中的场景委托内容
5. 移除MainViewController
中的构造函数

1. Remove Main.storyboard
2. In Info.plist set Main interface to (none)
3. In Info.plist set launch images to LaunchScreen.storyboard
4. Remove the scene delegate stuff in Info.plist
5. Remove the constructor in MainViewController

这里的主要问题是，您实际上是在通过提供此构造函数来告诉 iOS ViewController 有一个故事板:

What is the main issue here is that you are essentially telling iOS that the ViewController has a storyboard by supplying this constuctor:

public MainViewController() : base(nameof(MainViewController), null)
{
}

还通过 Info.plist 告诉 iOS 使用故事板和所有场景委托内容.

Also are telling iOS to use storyboards through the Info.plist with all the scene delegation stuff.

我创建了一个 PR，显示需要更改哪些内容以使其在没有 storboard 的情况下运行，并显示您在 ViewController 上设置的蓝色背景颜色.

I've created a PR showing what needs to be changed to make it run without the storboard and show the blue background color you've set on your ViewController.

https://github.com/sinight95/TestApp/pull/1

这篇关于如何在没有故事板的情况下在 iOS 中使用 MvvmCross?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！