In iOS 13.0 and later, you can configure your app to adopt a dark system-wide appearance, named Dark Mode. In Dark Mode, a darker color palette is used for all user interface elements, and colors are modified to make foreground content stand out against darker backgrounds.
To watch a video of Apple's presentation on Dark Mode during WWDC 2019, see https://developer.apple.com/videos/play/wwdc2019/214/.
You have implemented all the screens and functionality required for your app in the previous parts of this book. Since you've been building the app in Xcode 11 and using iOS 13 in the Simulator, your app is already configured for Dark Mode. Let's turn it on in the Simulator. Do the following steps:
- Build and run the app so that you can see how it looks in the default mode (Light Mode).
- Stop the app. The Simulator reverts to the...
