It usually looks like a circle along a horizontal bar. Another problem with the SwitchCell is the switch itself.But when the theme changes, then the text color stays the same and you don't see the text anymore. They seem to magically recognize the color when the app starts and render with light/dark text so that they are readable against the background. The SwitchCells do not have a TextColor property.But these are not changed when the theme changes. I specified in values/styles.xml with different colors in the colors.xml files.When I change the theme, then they look like this: Here are screenshots from the sample app when it starts in light and dark mode: This works fine when the app is restarted, but when the theme changes while it is already running, then these colors are not applied. I have different colors in the values-night folder. Mainly those which I specified in the files values/colors.xml and values-night/colors.xml. Now the activity is not restarted anymore, but some colors are not applied. So I added ConfigChanges.UiMode to the ConfigurationChanges in my MainActivity. Note: On Android, you can choose to disable dark mode on selective views by setting android:forceDarkAllowed.I want to keep my app running when the device changes between light and dark mode. Your app will work as normal in always light mode. This will ignore any trait changes and your app will work as normal (always light mode).įor Android, if you are not using the theme, and do not have resources (folders) with -night identifier, you don’t have to change anything. If your app is not ready to support dark mode just yet, fear not.įor iOS, you can set UIUserInterfaceStyle property in ist to light. If ((UiMode.NightYes))Īnd that is it for Android. When the OS changes UiMode, it will recreate the activity and the Set Theme() method will propagate the change to our Xamarin.Forms views, protected override void OnCreate(Bundle savedInstanceState) This is much simpler than iOS where we had to create a PageRenderer. To do so, we simply set the to desired theme ResourceDictionary in our MainActivity. Now that we have the OS configurations setup, we need to update our shared code of the Xamarin.Forms application. Subsequently, we can have different colors list for each theme,Īnd simply use the colors list in our theme, 3 Apply Theme Behind the scene, this theme is implemented as this, Note: Images and icon names should be the same so they can be found when you ask for “github” or “github.png” for instance.īack to styles, since we now have two theme (style) files, we will have both of them inherit from. In our example, we have images for light and dark mode, so we placed them in the appropriate folders. We will also create a values-night folder that will hold our dark/night theme style and colors. So, we will create a drawable-night (or any other folder that holds our drawables, images and icons, etc.). In Android Q, there is a dedicated Dark mode which uses UiMode flags.Īs mentioned, the OS will look for these identifiers to locate resources. Android □Īndroid introduced the UiModeManager to handle day and night mode in API 8. As the trait (mode) changes, our app will reflect the change immediately, as intended. If (TraitCollection.UserInterfaceStyle = UIUserInterfaceStyle.Dark)Īpp.Current.Resources = new LightTheme() Īnd that’s it. If (TraitCollection.UserInterfaceStyle != previousTraitCollection.UserInterfaceStyle) public override void TraitCollectionDidChange(UITraitCollection previousTraitCollection) Now that we are subscribed to mode changes, we can reflect theme changes in the shared code of Xamarin.Forms application by updating to the desired theme ResourceDictionary. public override void TraitCollectionDidChange(UITraitCollection previousTraitCollection)īase.TraitCollectionDidChange(previousTraitCollection) We can get to this callback via our platform using a custom PageRenderer. We can subscribe to mode changes in our current ViewController by overriding the TraitCollectionDidChange method. This makes is simple to set colors and icons in iOS and based on mode change, the resources are automatically loaded by the OS. in light mode, dark mode and any mode (the default option). To support normal (light) and dark mode, Xcode 11+ provides options under Assets.xcassets to set resources such as Colors, Images, Icons, etc. Now that we have the two themes ready, let’s get to the platforms. This should be enough for getting started. To keep track of current theme, we add a property in our App class, public Theme AppTheme Or in the code behind, = new LightTheme() In App.xaml, we will set a default theme, it may look something like this, Create a ResourceDictionary for Light theme, ☀️
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