SwiftUI and Cocoa are two different frameworks for building user interfaces on Apple's platforms. SwiftUI is a modern, declarative framework for building user interfaces, introduced in 2019 as part of the release of iOS 13. Cocoa, on the other hand, is a more traditional, object-oriented framework that has been around for many years and is used in many of Apple's own apps.
One of the main differences between the two frameworks is the way they are used to build user interfaces. SwiftUI uses a declarative syntax, which means you describe the desired end result of your user interface, and the framework takes care of creating the appropriate views and interactions. Cocoa, on the other hand, uses an imperative syntax, which means you have to specify each individual step required to create your user interface.
Another key difference between the two frameworks is their approach to user interface design. SwiftUI introduces a new design system called "Adaptive Layout," which allows your user interfaces to automatically adapt to different screen sizes and device orientations. Cocoa, on the other hand, relies more on fixed layout designs, where the developer has to specify the exact position and size of each user interface element.
Overall, SwiftUI is a modern, powerful framework for building user interfaces that is well suited to the needs of today's app developers. Cocoa is a more established, mature framework that has been used to build many successful apps, but it may not be as well suited to the needs of modern, fast-paced development teams.