Similar to Peek and Pop, context menus provide quick access to common or advance functions without cluttering the user interface. Even better, context menus do not require support for 3D Touch to work.
Last year Dark Mode was a standout feature for macOS Mojave. With iOS 13 Dark mode comes to iOS. Update your apps to integrate with the system preference to enable Dark Mode throughout iOS.
Starting in iOS 13, the default modal presentation style is a card style providing a sense of depth. The new card style also allows user to dismiss the card with a swipe.
iPad apps will now be able to support multiple instances side by side. This will be big for productivity and document centric apps on the iPad.
Sign in with Apple ID
If your app already supports social sign-in, then this feature is required for you. With iOS 13, users can now sign-in to apps using their Apple ID with an extra emphasis on user privacy.