About Custom Keyboard Target Question ? : I looking for create a keyboard application, But : Xcode create an UIkit file for this one. I don't want to rewrite this application in 4 months. So what i do ? Try to encapsulate a swiftUI in UIkit Wait a moment for a release of Keyboard Extension You have an other solution where I miss out. Documentation https://developer.apple.com/documentation/uikit/keyboards_and_input/creating_a_custom_keyboard More Doc. https://developer.apple.com/documentation/uikit/keyboards_and_input/creating_a_custom_keyboard/configuring_a_custom_keyboard_interface https://developer.apple.com/documentation/uikit/keyboards_and_input/creating_a_custom_keyboard/handling_text_interactions_in_custom_keyboards https://developer.apple.com/design/human-interface-guidelines/ios/extensions/custom-keyboards/