Add support for the new SwiftUI framework

Description

• Add support for the new SwiftUI framework

Other Information

• Dev docs: https://developer.apple.com/documentation/swiftui/
• Dev tutorials: https://developer.apple.com/tutorials/swiftui/
• Relevant WWDC sessions:
  • SwiftUI Essentials: https://developer.apple.com/videos/play/wwdc2019/216/
  • Data Flow Through SwiftUI: https://developer.apple.com/videos/play/wwdc2019/226
  • Building Custom Views with SwiftUI: https://developer.apple.com/videos/play/wwdc2019/237/
  • SwiftUI on All Devices: https://developer.apple.com/videos/play/wwdc2019/240/
  • Accessibility in SwiftUI: https://developer.apple.com/videos/play/wwdc2019/238/
• Related to Add support for the new Combine framework #82 Add support for the new Combine framework