Compose Multiplatform composable not rendering inside SwiftUI Form

Question

I'm unable to render a Compose Multiplatform view inside a SwiftUI Form. However, it works outside of the Form.

SwiftUI view:

struct ContentView: View {
    var body: some View {
        Form {
            Section {
                KMPView()
            }
        }
        KMPView()
    }
}

struct KMPView: UIViewControllerRepresentable {
    func makeUIViewController(context: Context) -> UIViewController {
        return KMPView_iosKt.ComposeEntryPoint()
    }

    func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
    }
}

KMPView.ios.kt:

import androidx.compose.ui.window.ComposeUIViewController
import androidx.compose.material.Text
import platform.UIKit.UIViewController

fun ComposeEntryPoint(): UIViewController =
    ComposeUIViewController {
        Text("Hello from Compose")
    }

This results in the view inside the Form not being rendered but the one outside of it works fine

lorem ipsum · Accepted Answer · 2025-03-19 11:04:39Z

0

Try adding a size. It likely has to do with default constrainsts.

KMPView()
     .frame(width: 200, height: 200)

     //or

     .frame(maxWidth: .infinity, maxHeight: .infinity)

Form is a type of scroll view and scroll views default views to zero when they can’t find an ideal size.

It can natively happen in SwiftUI if you put a ScrollView inside a List. The inner view would have no default size.

answered Mar 19 at 11:04

lorem ipsum

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1 Comment

Oskar Persson Mar 19 at 11:46

I've tried both of those, unfortunately neither solves the problem. The second one results in the same as the original. The first one creates a bigger blank box

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