我在设置 MvvmCross 6.0 时做错了什么? [英] What did I do wrong on setting up MvvmCross 6.0?

问题描述

我是 MvvmCross 6.0 和 Xamarin 的新手.

我正在尝试遵循 这里是 MvvmCrosss 5.5 的教程

我按照说明操作，

1. 将 App.xaml 创建为 MvxFormsApplication

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 <?xml version="1.0" encoding="utf-8" ?><core:MvxFormsApplication xmlns="http://xamarin.com/schemas/2014/forms"xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"xmlns:core="clr-namespace:MvvmCross.Forms.Core;assembly=MvvmCross.Forms"x:Class="App3.App"></core:MvxFormsApplication>

2. CoreApp.cs 作为 MvxApplication 并运行 RegisterAppStart()；在我覆盖的 Initialize() 中

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公共类 CoreApp : MvxApplication{公共覆盖无效初始化(){可创建类型().EndingWith("服务").AsInterfaces().RegisterAsLazySingleton();可创建类型().EndingWith("客户").AsInterfaces().RegisterAsLazySingleton();//注册appstart对象RegisterAppStart();}}

3. MainPageViewModel 继承 MvxViewModel

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公共类 MainPageViewModel : MvxViewModel{}

4. 创建为 MvxContentPage 且类型为 MainPageViewModel 的视图

5. 删除了 MainActivity 并创建了一个名为 MainApplication.cs 的文件，如下所示

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[Activity(Label = "MvvmcrossGettingStarted", Icon = "@drawable/icon", Theme = "@style/MainTheme", MainLauncher = true,

ConfigurationChanges = ConfigChanges.ScreenSize |ConfigChanges.Orientation)]公共类 MainActivity : MvxFormsAppCompatActivity{protected override void OnCreate(Bundle bundle){TabLayoutResource = Resource.Layout.Tabbar;ToolbarResource = Resource.Layout.Toolbar;

 base.OnCreate(bundle);var startup = Mvx.Resolve();启动.开始()；InitializeForms(bundle);}}公共类设置:MvxFormsAndroidSetup{公共设置():基础(){}受保护的覆盖 IEnumerableAndroidViewAssemblies =>new List(base.AndroidViewAssemblies.Union(new[] { typeof(App).GetTypeInfo().Assembly }).Except(new[] { this.GetType().Assembly }));受保护的覆盖应用程序 CreateFormsApplication(){返回新的应用程序()；}受保护的覆盖 IMvxApplication CreateApp() =>新的核心应用程序()；}

然而，我启动了应用程序，它给了我空异常，说 OnCreated 方法中的bundle"参数为空.

附言该教程提到创建 Setup.cs，但我不知道该 Setup.cs 是如何由代码运行的....我看不到引用它的地方.

解决方案

我不知道您为什么在使用 v 6.0 时查看 5.5 版教程.尝试遵循 分步指南，来自同一作者，但适用于 6.0 版

您可能还想从他的 GitHub 存储库下载 Nick 的示例，检查事情是如何运作的.

I am new to MvvmCross 6.0 and Xamarin.

I am trying to follow the tutorial here that for MvvmCrosss 5.5

I followed the explanation,

1. Created App.xaml as MvxFormsApplication

    <?xml version="1.0" encoding="utf-8" ?>
<core:MvxFormsApplication xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:core="clr-namespace:MvvmCross.Forms.Core;assembly=MvvmCross.Forms"
             x:Class="App3.App">
</core:MvxFormsApplication>

2. CoreApp.cs as MvxApplication and runs RegisterAppStart(); in my overrided Initialize()

public class CoreApp : MvxApplication
    {

        public override void Initialize()
        {
            CreatableTypes()
                .EndingWith("Service")
                .AsInterfaces()
                .RegisterAsLazySingleton();

            CreatableTypes()
                .EndingWith("Client")
                .AsInterfaces()
                .RegisterAsLazySingleton();

            // register the appstart object
            RegisterAppStart<MainPageViewModel>();
        }
    }

3. MainPageViewModel to inherited MvxViewModel

public class MainPageViewModel : MvxViewModel
    {
    }

4. View that created as MvxContentPage with type MainPageViewModel

<Label Text="Welcome to Xamarin.Forms!" 
       VerticalOptions="Center" 
       HorizontalOptions="Center" />

5. Removed MainActivity and created a file called MainApplication.cs as follow

[Activity(Label = "MvvmcrossGettingStarted", Icon = "@drawable/icon", Theme = "@style/MainTheme", MainLauncher = true,

ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)] public class MainActivity : MvxFormsAppCompatActivity { protected override void OnCreate(Bundle bundle) { TabLayoutResource = Resource.Layout.Tabbar; ToolbarResource = Resource.Layout.Toolbar;

            base.OnCreate(bundle);

            var startup = Mvx.Resolve<IMvxAppStart>();
            startup.Start();
            InitializeForms(bundle);

        }
    }


    public class Setup : MvxFormsAndroidSetup
    {
        public Setup():base()
        {

        }

        protected override IEnumerable<Assembly> AndroidViewAssemblies => new List<Assembly>(base.AndroidViewAssemblies
            .Union(new[] { typeof(App).GetTypeInfo().Assembly })
            .Except(new[] { this.GetType().Assembly })
        );

        protected override Application CreateFormsApplication()
        {
            return new App();
        }


        protected override IMvxApplication CreateApp() => new CoreApp();
    }

However what I started the app, its gives me null exception saying "bundle" parameter is null in OnCreated method.

P.S. The tutorial mention to create the Setup.cs, but I have no idea how does that Setup.cs being run by the code.... I see no where that is referencing it.

解决方案

I'm not sure why you're looking at the version 5.5 tutorial while working with v 6.0. Try following step by step guide, from same author, but for version 6.0

You might also want to download Nick's sample, from his GitHub repo, to check how things work.

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