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Xamarin.Forms applications can respond to style changes dynamically at runtime by using the DynamicResource markup extension. This markup extension is similar to the StaticResource markup extension, in that both use a dictionary key to fetch a value from a ResourceDictionary. However, while the StaticResource markup extension performs a single dictionary lookup, the DynamicResource markup extension maintains a link to the dictionary key. Therefore, if the value associated with the key is replaced, the change is applied to the VisualElement. This enables runtime theming to be implemented in Xamarin.Forms applications.

The process for implementing runtime theming in a Xamarin.Forms application is as follows:

  1. Define the resources for each theme in a ResourceDictionary.
  2. Consume theme resources in the application, using the DynamicResource markup extension.
  3. Set a default theme in the application's App.xaml file.
  4. Add code to load a theme at runtime.

Important

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Use the StaticResource markup extension if you don't need to change the app theme at runtime.

The following screenshots show themed pages, with the iOS application using a light theme and the Android application using a dark theme:

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Note

Changing a theme at runtime requires the use of XAML styles, and is not currently possible using CSS.

Define themes

A theme is defined as a collection of resource objects stored in a ResourceDictionary.

The following example shows the LightTheme from the sample application:

The following example shows the DarkTheme from the sample application:

Each ResourceDictionary contains Color resources that define their respective themes, with each ResourceDictionary using identical key values. For more information about resource dictionaries, see Resource Dictionaries.

Important

A code behind file is required for each ResourceDictionary, which calls the InitializeComponent method. This is necessary so that a CLR object representing the chosen theme can be created at runtime.

Set a default theme

An application requires a default theme, so that controls have values for the resources they consume. A default theme can be set by merging the theme's ResourceDictionary into the application-level ResourceDictionary that's defined in App.xaml:

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For more information about merging resource dictionaries, see Merged resource dictionaries.

Consume theme resources

When an application wants to consume a resource that's stored in a ResourceDictionary that represents a theme, it should do so with the DynamicResource markup extension. This ensures that if a different theme is selected at runtime, the values from the new theme will be applied.

The following example shows three styles from the sample application that can be applied to Label objects:

These styles are defined in the application-level resource dictionary, so that they can be consumed by multiple pages. Each style consumes theme resources with the DynamicResource markup extension.

These styles are then consumed by pages:

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When a theme resource is consumed directly, it should be consumed with the DynamicResource markup extension. However, when a style that uses the DynamicResource markup extension is consumed, it should be consumed with the StaticResource markup extension.

For more information about styling, see Styling Xamarin.Forms Apps using XAML Styles. For more information about the DynamicResource markup extension, see Dynamic Styles in Xamarin.Forms.

Load a theme at runtime

When a theme is selected at runtime, the application should:

  1. Remove the current theme from the application. This is achieved by clearing the MergedDictionaries property of the application-level ResourceDictionary.
  2. Load the selected theme. This is achieved by adding an instance of the selected theme to the MergedDictionaries property of the application-level ResourceDictionary.

Any VisualElement objects that set properties with the DynamicResource markup extension will then apply the new theme values. This occurs because the DynamicResource markup extension maintains a link to dictionary keys. Therefore, when the values associated with keys are replaced, the changes are applied to the VisualElement objects.

In the sample application, a theme is selected via a modal page that contains a Picker. The following code shows the OnPickerSelectionChanged method, which is executed when the selected theme changes:

Related links

Welcome to the WordPress Theme Developer Handbook, your resource for learning all about the exciting world of WordPress themes.

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The Theme Developer Handbook is a repository for all things WordPress themes. Whether you’re new to WordPress themes, or you’re an experienced theme developer, you should be able to find the answer to many of your theme-related questions right here.

  1. If you’re new to developing WordPress themes, start with section 1, where you can find out what a theme is, learn about WordPress’ license, set up your development environment, and build your first theme.
  2. Once you’re through the introduction, the Theme Basics section will introduce you to the building blocks of a WordPress theme.
  3. The Theme Functionality section will show you all of the different types of functionality you can make use of in your theme.
  4. If you’re looking to give flexibility and yet protect your users, head over to the Customizer and Security sections
  5. If you’ve got to grips with the basics of themes, check out the Advanced Theme Topics to learn about child themes, best UI practices, theme testing and more.
  6. Once you’ve got your theme ready for the world, the final section will cover releasing your theme, teaching you some best practices for theme distribution, and for getting it ready for the WordPress.org theme directory.
Tip: If you want to learn about experimental block themes go to the Block Editor Handbook. The Theme Developer Handbook is being updated with information about new features.

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The WordPress Theme Developer Handbook is created by the WordPress community, for the WordPress community. We are always looking for more contributors; if you’re interested stop by the docs team blog to find out more about getting involved.

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