Challenges Migrating from UIKit to SwiftUI for a Feature on iOS 17 Devices
I'm writing unit tests and During development, my team is migrating an existing UIKit-based feature for our new iOS app to SwiftUI. The goal is to improve maintainability and leverage the latest capabilities of iOS 17. One of the key challenges is integrating complex gestures and animations that were initially implemented with gesture recognizers in UIKit. We tried using `DragGesture` and `LongPressGesture`, but found the combination difficult to manage when transitioning between states. Here’s a snippet of what we attempted: ```swift struct GestureView: View { @GestureState private var isDragging = false @State private var offset = CGSize.zero var body: some View { Rectangle() .fill(Color.blue) .frame(width: 100, height: 100) .offset(offset) .gesture( DragGesture() .updating($isDragging) { value, state, _ in state = true } .onChanged { value in self.offset = value.translation } .onEnded { _ in self.offset = .zero } ) } } ``` Despite this approach, the animations felt choppy, especially on older devices like the iPhone 12. We also noticed that stack views were not behaving as expected when dynamically changing content. The layout shifts weren’t smooth, and it was disheartening as our user experience focus has always been paramount. Following best practices, we also tried to optimize our performance by using `withAnimation`, but this didn't yield the expected results. To dig deeper, I ran performance benchmarks during these gestures and saw that frame updates were causing significant lag. I've considered refactoring the component to utilize a more declarative approach with explicit states for the components involved. However, I'm uncertain whether this will solve the performance lag or if there are better alternatives. Have other developers faced similar issues during a migration project? What strategies did you find effective for integrating complex gestures and ensuring smooth animations in SwiftUI? My team is using Swift for this REST API. Has anyone dealt with something similar? I'd be grateful for any help. This is part of a larger microservice I'm building. Any advice would be much appreciated.