Hi everyone, I’m working on a Kotlin Multiplatform (KMM) project with Compose Multiplatform (CMP). I...

# multiplatform

[Vivek Modi]

Hi everyone, I’m working on a Kotlin Multiplatform (KMM) project with Compose Multiplatform (CMP). I’ve integrated Stripe payments on Android successfully, and now I’m trying to integrate Stripe on iOS.

[Vivek Modi]

I’ve created a StripeController class in Swift and marked it with @objc so it can be used from Kotlin/Native. Here's the Swift class:

@objc class StripeController: NSObject {
    // Stripe setup and present logic...
}

[Vivek Modi]

In my Kotlin iOS code (iosMain), I'm trying to import and use this Swift class like this:

[Vivek Modi]

import iosApp.StripeController
private val stripeController = StripeController()

[Vivek Modi]

However, I’m getting an "Unresolved reference: StripeController" error when trying to import or use it.

[Vivek Modi]

The StripeController is inside the iosApp module, and I’ve already:

Marked the Swift class and its methods with @objc

Ensured the class inherits from NSObject

[Vivek Modi]

Is there something I might be missing in order to make the Swift class visible to Kotlin/Native?

Any help would be appreciated — thanks!

[Daniel Dello]

From my understanding your shared module does not depend on the iosApp module, it's the other way around, so it's unable to see the StripeController code.

There are a couple of ways you could achieve this communication, but the most common way you find when looking into tutorials would be to declare an interface in your shared modules iOSMain code and have it be implemented in Swift in the iOSApp and inject it via DI (or some global variable) so that it can be used in shared.

[Chrimaeon]

Also, there is no KMM acronym any more. 😉
https://blog.jetbrains.com/kotlin/2023/07/update-on-the-name-of-kotlin-multiplatform/

[Vivek Modi]

Hey daniel, do you have any examples?

[chrisjenx]

I have a PaymentLauncher intent that I implement in each platform:

class IOSPaymentsLauncher : PaymentsLauncher {
    
    // set by the ComposeView
    var rootViewController: UIViewController? = nil
    var paymentSheet: PaymentSheet? = nil
func showStripeBankAccountSheet(stripeSetupIntentResponse: ApiStripeSetupIntentResponse) async throws -> AddPaymentMethodResult {
/// etc

[chrisjenx]

then when building the AppComponent that gets passed into my DI on each platform