Since its introduction in 2019, SwiftUI has evolved considerably. With iOS 18 and Apple's continuous improvements, the choice between SwiftUI and UIKit is different today. Here's an analysis based on my iOS development experience.
The State of SwiftUI in 2025
SwiftUI has come a long way. The performance issues that existed in early versions are largely resolved. The framework now efficiently handles complex lists with LazyVStack and LazyHStack, and integration with UIKit is smooth via UIViewRepresentable.
iOS 18 introduced new APIs like NavigationStack improvements, customizable Control Center controls, and better animation handling with new transition APIs.
The main advantage remains productivity: less boilerplate code, real-time preview, and a declarative syntax that makes code more readable and maintainable.
When to Choose SwiftUI
SwiftUI is the ideal choice for new projects targeting iOS 16+. The learning curve is gentler for new developers, and code maintenance is simplified.
For apps with dynamic user interfaces and complex animations, SwiftUI excels. Implicit and explicit animations are intuitive to implement.
Multi-platform apps (iOS, macOS, watchOS, tvOS) benefit greatly from SwiftUI thanks to easier code sharing.
struct ContentView: View {
@State private var isAnimating = false
var body: some View {
VStack {
Image(systemName: "star.fill")
.scaleEffect(isAnimating ? 1.5 : 1.0)
.animation(.spring(duration: 0.5), value: isAnimating)
}
.onTapGesture { isAnimating.toggle() }
}
}When UIKit Remains Relevant
For apps requiring iOS 13-15 support, UIKit remains essential. Some advanced features like collection views with complex custom layouts are still more flexible in UIKit.
Existing projects with a large UIKit codebase shouldn't migrate hastily. A progressive approach, integrating SwiftUI for new features, is more pragmatic.
Some system components like UIDocumentPickerViewController or certain CoreData APIs are simpler to use directly in UIKit.
Progressive Migration Strategy
The best approach is to use UIHostingController to integrate SwiftUI views into an existing UIKit app. This allows you to benefit from SwiftUI advantages without rewriting the entire application.
Start with the simplest screens: settings, user profiles, forms. These interfaces immediately benefit from SwiftUI's conciseness.
Avoid migrating screens with complex interactions or critical performance until you master SwiftUI patterns.
Conclusion
In 2025, SwiftUI is mature enough to be the default choice for new iOS projects. For existing apps, progressive migration remains the wisest strategy. The important thing is to choose the right tool for each situation rather than blindly following trends.