Can I use SwiftUI?

[brettwillis]

This is probably a silly question, but can I use this to create Kotlin bindings for SwiftUI? E.g. can I build a SwiftUI interface in Kotlin code?

[Alox1d]

The plugin cannot expose SwiftUI's view-building API directly to Kotlin: its interop boundary is Objective-C, while SwiftUI views are Swift structs and generic types.

You can keep a SwiftUI screen in Swift and expose an Objective-C-compatible factory returning UIViewController:

import Foundation
import SwiftUI
import UIKit

@objc public final class SwiftScreenFactory: NSObject {
    @MainActor
    @objc public static func makeGreeting(_ title: String) -> UIViewController {
        UIHostingController(rootView: Text(title))
    }
}

Put that Swift file in the source directory configured for swiftklib. Kotlin then calls the generated factory from iosMain and presents or embeds the returned UIKit controller. Pass strings, callbacks and other Objective-C-compatible values through that wrapper to connect it to your shared logic. Create and present UI on the main thread.

This gives Kotlin a usable screen boundary, but the SwiftUI layout itself remains Swift code; swiftklib does not supply a Kotlin version of the SwiftUI DSL.

Sources: the plugin's Objective-C compatibility requirement, Kotlin's Swift import limitations, and Apple's UIHostingController.