Navigating SwiftUI and UIKit integration during migration from Objective-C
I need some guidance on I've looked through the documentation and I'm still confused about Currently developing an iOS application that involves migrating a legacy Objective-C codebase to SwiftUI... The challenge arises when I try to integrate SwiftUI views within existing UIKit components, especially given that our app relies heavily on UIKit for its structure. I've read through Apple’s documentation on SwiftUI but find myself stuck when it comes to managing the lifecycle of SwiftUI views embedded in UIKit. To tackle this, I attempted to use `UIHostingController`, which provides a way to wrap SwiftUI views. Here’s a simplified example of how I integrated a SwiftUI view into an existing UIViewController: ```swift import SwiftUI class MyViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() let swiftUIView = MySwiftUIView() let hostingController = UIHostingController(rootView: swiftUIView) addChild(hostingController) hostingController.view.frame = view.bounds view.addSubview(hostingController.view) hostingController.didMove(toParent: self) } } ``` Even though the initial integration works, I run into issues while trying to pass data between the UIKit components and the SwiftUI views. For instance, I need to update the SwiftUI view state based on user interactions with UIKit elements like buttons. I've tried using ObservableObject and Bindings but still feel uncertain about the best practices for maintaining synchronization. Here’s a snippet showing my attempt to pass data: ```swift class ViewModel: ObservableObject { @Published var title: String = "Initial Title" } struct MySwiftUIView: View { @ObservedObject var viewModel: ViewModel var body: some View { Text(viewModel.title) } } ``` In my ViewController, I create an instance of `ViewModel` and pass it to `MySwiftUIView`, but I’m not sure how to efficiently update `viewModel.title` from a UIKit button action: ```swift @IBAction func updateTitleButtonPressed(_ sender: UIButton) { viewModel.title = "Updated Title" } ``` The changes don't seem to reflect in the SwiftUI view, which leads me to believe there's a problem with the binding. Any insights or best practices on how to effectively manage state and data flow between UIKit and SwiftUI during this migration would be immensely helpful. Also, are there nuances I should consider regarding performance when embedding SwiftUI in UIKit? I recently upgraded to Swift stable. I'd really appreciate any guidance on this. This is for a desktop app running on CentOS. Thanks for your help in advance!