When selecting one of the options, you’ll get one of the three results you see in this article’s header image. I cannot import nor vssettings.xml (cannot add it in UI) neither vssettings.json (format is incorrect) from studiostyl. I have searched forums and other sources and did not find any info solving my problem. My main goal is to improve built-in Monokai color theme. The important thing is that you call the helper class’s ChangeTheme method and pass the theme name that you need to change to: Ive tried to customize color themes for VS on OS X and did not find a way to do so. You can of course use whatever UI control you’d like to change themes, for example a Picker. I’m using a RadSegmentedControl to change the theme, and a RadListView to easily see the difference between themes. You can use a Xamarin.Forms ResourceDictionary type if you’re using a newer version that supports it. We created this when Xamarin.Forms didn’t have MergeWith support. You may have noticed that I’m using a RadResourceDictionary. You can put this logic entirely in your settings page if you’d prefer. I usually like to create a static class like this so that I can change the theme from anywhere in the app, but isn’t necessary. In the custom dark theme example below, the Color resource key values are pretty clear as to what they do. You can find the Color names we use for your controls in the Themes Overview documentation. Now, you can add in all the styles and colors you want in that one dictionary. Xamarin.Forms doesn’t have a good ResourceDictionary template, so start with a Content Page (XAML) template and then change the ContentPage type to “ResourceDictionary” in both the XAML and code-behind. Create your custom theme’s ResourceDictionary DevExpress UI controls abstract the complexities of native mobile development. All Xamarin UI controls are written in Objective-C for iOS and Java/Kotlin for Android and are seamlessly integrated with the Xamarin Forms platform. Let me walk you through a very simple demo to illustrate the approach. DevExpress Xamarin Charts use OpenGL graphics rendering with C++ for the best possible performance on mobile devices. With this approach you can swap out ResourceDictionaries at runtime for a nice user-selected theme feature in your app’s settings. You can easily style individual items, but you can also define an entire theme at once in a separate ResourceDictionary. Telerik UI for Xamarin comes with two themes out of the box, Default and Blue.
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