Apple has taken a big step forward with their new SwiftUI framework for implementing user interfaces on macOS and iOS platforms. We like that SwiftUI moves beyond the somewhat kludgy relationship between Interface Builder and XCode and adopts a coherent, declarative and code-centric approach. You can now view your code and the resulting visual interface side by side in XCode 11, making for a much better developer experience. The SwiftUI framework also draws inspiration from the React.js world that has dominated web development in recent years. Immutable values in view models and an asynchronous update mechanism make for a unified reactive programming model. This gives developers an entirely native alternative to similar reactive frameworks such as React Native or Flutter. Although SwiftUI definitely represents the future of Apple UI development, it is quite new and it will take time to smooth out the rough edges. We look forward to improved documentation and a community of developers who can establish a set of practices for testing and other engineering concerns.