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SwiftUI
Apple's declarative UI framework — build native apps for iOS, macOS, watchOS, and tvOS with a single Swift codebase.
SwiftUI replaced UIKit’s imperative model with a declarative syntax where UI is a function of state. Property wrappers like @State, @Binding, and @ObservedObject handle reactivity. SwiftUI runs across the entire Apple platform family, and Apple has made clear it is the future of Apple platform development.
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iosmacosmobileappleuideclarativecross-platform