如何使用 Fresh.MVVM 在 Xamarin.Forms 中浏览模式页面

Question

我试图在按下按钮时使用 MVVM 在我的 xamarin 表单应用程序中推送模式页面。我已经知道如何使用导航堆栈，但不知道如何将内容页面用作模态页面，我尝试了多种方法，尤其是调用 PushPageModel 方法。

这是我尝试过的最后一件事：查看或页面：

<Label
                x:Name="forgottenPasswordLabel"
                Text="Forgot password?"
                TextColor="LightPink"
                FontSize="16"
                FontAttributes="Bold"

                VerticalOptions="Start"
                HorizontalOptions="End"
                Margin="25,0,25,25">
                <Label.GestureRecognizers>
                    <TapGestureRecognizer Command="{Binding ForgotPasswordCommand}"/>
                </Label.GestureRecognizers>
</Label>

视图模型class:

public class LogInViewModel : FreshBasePageModel
    {
        public ICommand ForgotPasswordCommand { get; set; }

        public LogInViewModel()
        {
        }

        public override void Init(object initData)
        {
            ForgotPasswordCommand = new Command (async() =>
            {
                var newPage = FreshPageModelResolver.ResolvePageModel<ForgottenPasswordViewModel>();
                await CoreMethods.PushPageModel<ForgottenPasswordViewModel>(null, false, true);
            }); 
        }
    }

App.xaml.cs class:

public App()
        {
            InitializeComponent();

            MainPage = FreshPageModelResolver.ResolvePageModel<LogInViewModel>();
        }

此代码给出以下错误："FreshTinyIoC.TinyIoCResolutionException: 'Resolve failed: IFreshNavigationService"

就是这样，如果您需要更多信息，我会在看到您的请求后立即提供，谢谢大家的宝贵时间，希望您今天过得愉快。

编辑：请求堆栈跟踪：

at FreshTinyIoC.FreshTinyIoCContainer.ResolveInternal (FreshTinyIoC.FreshTinyIoCContainer+TypeRegistration registration, FreshTinyIoC.NamedParameterOverloads parameters, FreshTinyIoC.ResolveOptions options) [0x000f7] in C:"Here goes the path" at FreshTinyIoC.FreshTinyIoCContainer.Resolve (System.Type resolveType, System.String name) [0x00000] in C:\"Here goes the path" at FreshTinyIoC.FreshTinyIoCContainer.Resolve[ResolveType] (System.String name) [0x00000] in C:"Here goes the path" at FreshMvvm.FreshTinyIOCBuiltIn.Resolve[ResolveType] (System.String name) [0x00000] in C:"Here goes the path" at FreshMvvm.PageModelCoreMethods.PushPageModelWithPage (Xamarin.Forms.Page page, FreshMvvm.FreshBasePageModel pageModel, System.Object data, System.Boolean modal, System.Boolean animate) [0x00177] in C:"Here goes the path" at FreshMvvm.PageModelCoreMethods.PushPageModel (FreshMvvm.FreshBasePageModel pageModel, System.Object data, System.Boolean modal, System.Boolean animate) [0x00048] in C:"Here goes the path" at FreshMvvm.PageModelCoreMethods.PushPageModel[T] (System.Object data, System.Boolean modal, System.Boolean animate) [0x00040] in C:"Here goes the path" at FirstApp.ViewModels.LogInViewModel.b__5_0 () [0x0003a] in D:\"Here goes the path"

Answer 1

问题是对概念的误解，我认为内容页和导航页是两种不同类型的页面，例如标签页、主详细页、轮播页和内容页。所以我试图不使用下面的代码，认为 FreshNavigationContainer 强迫我使用导航页面而不是内容页面，这是真的但不完全是，因为是的，它强迫你使用导航页面，但你也在使用一个内容页，因为导航页是内容页的属性，所以正如我所说，这都是对概念的误解:

public partial class App : Application
    {
        public App()
        {
            InitializeComponent();

            var thePage = FreshPageModelResolver.ResolvePageModel<LogInViewModel>();
            MainPage = new FreshNavigationContainer(thePage);
        }
}

我没有在问题上这么说，但所有这一切的目的是看不到屏幕顶部的栏，现在我明白了，因为导航页面和内容页面不是2 件不同的事情，您可以在 page.xaml 中使用：

<ContentPage NavigationPage.HasNavigationBar="False">

如何使用 Fresh.MVVM 在 Xamarin.Forms 中浏览模式页面

How to navigate through modal pages in Xamarin.Forms using Fresh.MVVM

c#

xamarin

xamarin.forms

freshmvvm