how to use swiftui in uikit

To use SwiftUI in UIKit, you can leverage the interoperability features provided by SwiftUI. Here are the key points and steps to achieve this:

1. Embedding UIKit Views in SwiftUI:

   • You can use UIViewRepresentable to wrap a UIKit view and use it within SwiftUI. This protocol allows you to create and update a UIKit view using imperative code.
   • Example:

     import SwiftUI
     import UIKit
     
     struct MyUIKitView: UIViewRepresentable {
         func makeUIView(context: Context) -> UIView {
             let view = UIView()
             // Configure your UIKit view here
             return view
         }
     
         func updateUIView(_ uiView: UIView, context: Context) {
             // Update the view with new data
         }
     }
     

2. Embedding SwiftUI Views in UIKit:

   • You can use UIHostingController to embed a SwiftUI view in a UIKit view hierarchy. This is useful when you want to integrate SwiftUI views into an existing UIKit-based app.
   • Example:

     import SwiftUI
     import UIKit
     
     class MyViewController: UIViewController {
         override func viewDidLoad() {
             super.viewDidLoad()
             
             let swiftUIView = MySwiftUIView()
             let hostingController = UIHostingController(rootView: swiftUIView)
             
             addChild(hostingController)
             view.addSubview(hostingController.view)
             hostingController.didMove(toParent: self)
             
             // Set constraints or frame for hostingController.view
         }
     }
     

3. Animations:

   • You can set up animations on UIKit views and drive them with SwiftUI, including fully custom animations. This allows you to use the full suite of SwiftUI animation types to animate UIKit views.
   • Example:

     import SwiftUI
     import UIKit
     
     struct ContentView: View {
         @State private var animate = false
     
         var body: some View {
             VStack {
                 MyUIKitViewWrapper()
                     .frame(width: 100, height: 100)
                     .background(animate ? Color.red : Color.blue)
                     .animation(.easeInOut(duration: 1), value: animate)
                 
                 Button("Animate") {
                     animate.toggle()
                 }
             }
         }
     }
     
     struct MyUIKitViewWrapper: UIViewRepresentable {
         func makeUIView(context: Context) -> UIView {
             let view = UIView()
             // Configure your UIKit view here
             return view
         }
     
         func updateUIView(_ uiView: UIView, context: Context) {
             // Update the view with new data
         }
     }
     

For more detailed information, you can refer to the following sessions from WWDC 2024:

• SwiftUI essentials (20:25)
• Enhance your UI animations and transitions (08:34)

These sessions cover the fundamentals of integrating SwiftUI with UIKit and provide practical examples and tips.