Xamarin.Forms-在黑暗与黑暗之间切换运行时轻主题 [英] Xamarin.Forms - Switching between Dark & Light themes at run time

问题描述

1-我们可以在Light& amp;之间切换的任何想法使用2.3.x版中引入的Xamarin.Forms主题的深色主题(下面的链接).任何解决方法? https://developer.xamarin.com/guides/xamarin-forms/用户界面/主题/

1 - Any idea if we can switch between Light & Dark themes using the Xamarin.Forms themes introduced in version 2.3.x (link below). Any workaround? https://developer.xamarin.com/guides/xamarin-forms/user-interface/themes/

2-自发布以来，我还看到此版本处于预览状态.有什么问题，我们不能在生产中使用它吗?

2 - Also I see this release is in preview ever since it was introduced. Are there any issues and we cannot use it in production?

推荐答案

接受的答案不符合假设您已经安装了软件包，请 Xamarin.Forms.Themes.Base ， Xamarin.Forms.Themes.Light 和 Xamarin.Forms.Themes.Dark ，并且您的 App.xaml 看起来像

Assuming you've installed the packages, Xamarin.Forms.Themes.Base, Xamarin.Forms.Themes.Light, and Xamarin.Forms.Themes.Dark, and your App.xaml looks like,

<?xml version="1.0" encoding="utf-8" ?>
<Application 
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:light="clr-namespace:Xamarin.Forms.Themes;assembly=Xamarin.Forms.Theme.Light"
    xmlns:dark="clr-namespace:Xamarin.Forms.Themes;assembly=Xamarin.Forms.Theme.Dark"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    x:Class="MyNamespace.MyApp">
    <Application.Resources>
        <ResourceDictionary MergedWith="light:LightThemeResources">
            ...
        </ResourceDictionary>
    </Application.Resources>
</Application>

您可以使用以下命令在运行时更改主题:

you can change the theme at run time with the following:

public enum Themes
{
    Dark,
    Light
}

var origin = App.Current.Resources;
switch (theme)
{
    case Themes.Dark:
        origin.MergedWith = typeof(DarkThemeResources);
        break;
    case Themes.Light:
        origin.MergedWith = typeof(LightThemeResources);
        break;
}

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