1、装置Masa Blazor
参考: MASA Blazor 装置
2、编写代码
新建Service目录，并增加ThemeService.cs
该RequestedTheme 属性返回 AppTheme 枚举成员。 AppTheme 枚举定义下列成员：
Unspecified，批示设施应用的是未指定的主题。
Light，批示设施正在应用其浅色主题。
Dark，批示设施正在应用其深色主题。
设施上的零碎主题可能会因各种起因而更改，具体取决于设施的配置形式。 当零碎主题更改时，能够通过解决 Application.RequestedThemeChanged 事件来告诉 .NET MAUI 利用。
namespace MauiMasaBlazorDemo.Service{ public class ThemeService { /// <summary> /// 获取以后零碎主题 /// </summary> /// <returns></returns> public AppTheme GetAppTheme() { return Application.Current!.RequestedTheme; } /// <summary> /// 零碎主题切换 /// </summary> /// <param name="handler"></param> public void ThemeChanged(EventHandler<AppThemeChangedEventArgs> handler) { Application.Current!.RequestedThemeChanged += handler; } }}在Platforms / Android /MainActivity.cs文件中 Activity的ConfigurationChanges须要蕴含ConfigChanges.UiMode，能力响应设施主题更改，应用 Visual Studio 我的项目模板创立的 .NET MAUI 利用会主动蕴含此标记。
[Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, //Activity须要解决的配置变动，须要蕴含在ConfigurationChanges中 ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | // 响应零碎主题变动 ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)]public class MainActivity : MauiAppCompatActivity{}在MauiProgram.cs 注入服务
builder.Services.AddSingleton<ThemeService>();批改Shared 目录下MainLayout.razor文件，增加一个底部导航栏，设置Dark属性IsDark，Masa Blazor的组件都能够通过Dark属性来反对暗色主题。
@inherits LayoutComponentBase<ErrorBoundary> <ChildContent> <MApp> <div style="height: calc(100vh - 56px); overflow-y: auto"> @Body </div> <MBottomNavigation Color="indigo" Absolute @bind-Value="value" Dark="IsDark"> <MButton> <MLabel>首页</MLabel> <MIcon>mdi-home</MIcon> </MButton> <MButton Class="mx-8"> <MLabel>工作台</MLabel> <MIcon>mdi-message-outline</MIcon> </MButton> <MButton> <MLabel>我的</MLabel> <MIcon>mdi-account-outline</MIcon> </MButton> </MBottomNavigation> </MApp> </ChildContent></ErrorBoundary>在Shared下新建MainLayout.razor.cs
using BlazorComponent;using MauiMasaBlazorDemo.Service;using Microsoft.AspNetCore.Components;namespace MauiMasaBlazorDemo.Shared{ public partial class MainLayout { StringNumber value = 0; [Inject] //注入主题服务 private ThemeService ThemeService { get; set; } private bool IsDark { get; set; } /// <summary> /// 解决零碎主题切换 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void HandlerAppThemeChanged(object sender, AppThemeChangedEventArgs e) { IsDark = e.RequestedTheme == AppTheme.Dark; InvokeAsync(StateHasChanged); } protected override async Task OnAfterRenderAsync(bool firstRender) { if (firstRender) { // 获取零碎主题 var appTheme = ThemeService.GetAppTheme(); // 依据零碎主题是否为Dark，为IsDark属性赋值 IsDark = appTheme == AppTheme.Dark; ThemeService.ThemeChanged(HandlerAppThemeChanged); StateHasChanged(); } await base.OnAfterRenderAsync(firstRender); } }}切换成果如下：
咱们曾经实现了底部导航栏追随零碎主题切换的性能，那如何实现全局替换呢？
在Masa Blazor中非常简单，只须要批改MainLayout.razor，将
Dark="IsDark" 增加到MApp即可
@inherits LayoutComponentBase<ErrorBoundary> <ChildContent> <MApp Dark="IsDark"> //全局款式 <div style="height: calc(100vh - 56px); overflow-y: auto"> @Body </div>... </MApp> </ChildContent></ErrorBoundary>咱们再看一下成果
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