In this example, the Image displays lightlogo.png when the device is using its light theme, and darklogo.png when the device is using its dark theme. Image.SetOnAppTheme(Image.SourceProperty, "lightlogo.png", "darklogo.png") The SetOnAppTheme method enables objects of type T to be specified that will be set on a target property based on the current system theme: Image image = new Image() In this example, the text color of the Label is set to green when the device is using its light theme, and is set to red when the device is using its dark theme. Label.SetAppThemeColor(Label.TextColorProperty, Color.Green, Color.Red) The SetAppThemeColor method enables Color objects to be specified that will be set on a target property based on the current system theme: Label label = new Label() Xamarin.Forms includes SetAppThemeColor and SetOnAppTheme extension methods that enable VisualElement objects to respond to system theme changes. In this example, the background color of the Grid and the Button style changes based on whether the device is using its light theme or dark theme.įor more information about the AppThemeBinding markup extension, see AppThemeBinding markup extension. In addition, resources defined in a ResourceDictionary can be consumed with the StaticResource markup extension: Similarly, the Image displays a different image file based upon the current system theme. In this example, the text color of the first Label is set to green when the device is using its light theme, and is set to red when the device is using its dark theme. The AppThemeBinding markup extension enables you to consume a resource, such as an image or color, based on the current system theme: In addition, objects that consume these resources are automatically updated if the system theme changes while an app is running. With these approaches, resources are automatically applied based on the value of the current system theme. Resources for light and dark themes can be consumed with the AppThemeBinding markup extension, and the SetAppThemeColor and SetOnAppTheme extension methods. The following screenshots show themed pages, for light and dark system themes on iOS and Android: The following requirements must be met for Xamarin.Forms to respond to a system theme change: Xamarin.Forms applications can respond to system theme changes by consuming resources with the AppThemeBinding markup extension, and the SetAppThemeColor and SetOnAppTheme extension methods. This includes the system theme being explicitly changed by the user, it changing due to the time of day, and it changing due to environmental factors such as low light. The system theme may change for a variety of reasons, depending on the device configuration. Applications should respect these system themes, and respond immediately when the system theme changes. ĪppCompatDelegate.DefaultNightMode = _ ? AppCompatDelegate.ModeNightYes : AppCompatDelegate.ModeNightNo ĭependencyService.Get().Devices typically include light and dark themes, which each refer to a broad set of appearance preferences that can be set at the operating system level. Change the default theme in styles.xml.To manually enable/disable the dark theme ,we have to implement on each platform and invoke it in forms with Dependency service. only applys for the theme defined with AppThemeBinding, but the dialog is build-in we can't customize the color so it would not work in this way.
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