This ensures that if a different theme is selected at runtime, the values from the new theme will be applied. 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. A default theme can be set by merging the theme's ResourceDictionary into the application-level ResourceDictionary that's defined in App.xaml: įor more information about merging resource dictionaries, see Merged resource dictionaries.
Set a default themeĪn application requires a default theme, so that controls have values for the resources they consume. This is necessary so that a CLR object representing the chosen theme can be created at runtime.
#Xamarin studio theme code#
For more information about resource dictionaries, see Resource Dictionaries.Ī code behind file is required for each ResourceDictionary, which calls the InitializeComponent method. The following example shows the DarkTheme from the sample application: Įach ResourceDictionary contains Color resources that define their respective themes, with each ResourceDictionary using identical key values. The following example shows the LightTheme from the sample application: Define themesĪ theme is defined as a collection of resource objects stored in a ResourceDictionary. Set a default theme in the application's App.xaml file.Ĭhanging a theme at runtime requires the use of XAML styles, and is not currently possible using CSS.Consume theme resources in the application, using the DynamicResource markup extension.Define the resources for each theme in a ResourceDictionary.The process for implementing runtime theming in a Xamarin.Forms application is as follows: This enables runtime theming to be implemented in Xamarin.Forms applications. Therefore, if the value associated with the key is replaced, the change is applied to the VisualElement.
However, while the StaticResource markup extension performs a single dictionary lookup, the DynamicResource markup extension maintains a link to the dictionary key. This markup extension is similar to the StaticResource markup extension, in that both use a dictionary key to fetch a value from a ResourceDictionary. Xamarin.Forms applications can respond to style changes dynamically at runtime by using the DynamicResource markup extension.
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