Can somebody point me to a sample KMP app that use...

# ios

[Trey]

Can somebody point me to a sample KMP app that uses SwiftUI with "@main" and UIApplicationDelegateAdaptor to use an AppDelegate defined in the iosMain section of the shared module? I can't get it to work.

[Trey]

It seems to me that this may be a bug with how kotlin native is implemented. There are two methods in UIApplicationDelegateProtocol that have the same name and same parameters. In swift the parameters have different names, but I don't know of a way to do this in kotlin when defining the overrides. Maybe this is just a Lint error.

@kotlin.commonizer.ObjCCallable public open expect fun application(application: platform.UIKit.UIApplication, didFinishLaunchingWithOptions: kotlin.collections.Map<kotlin.Any?, *>?): kotlin.Boolean { /* compiled code */ }

    @kotlin.commonizer.ObjCCallable public open expect fun application(application: platform.UIKit.UIApplication, willFinishLaunchingWithOptions: kotlin.collections.Map<kotlin.Any?, *>?): kotlin.Boolean { /* compiled code */ }

[Darron Schall]

Seems like a bug? I can reproduce this by making an AppDelegate in Kotlin with both methods defined. I get the following error:

Conflicting overloads: public open fun application(application: UIApplication, willFinishLaunchingWithOptions: Map<Any?, *>?): Boolean defined in AppDelegate, public open fun application(application: UIApplication, didFinishLaunchingWithOptions: Map<Any?, *>?): Boolean defined in AppDelegate

Can't try to differentiate with @ObjCName either, due to:

@ObjCName is not applicable on overrides

As a workaround I think you'll want to create your AppDelegate in Swift and call into your shared library code from the Swift methods.

[ribesg]

You can just suppress conflicting overloads

[Trey]

How would I do that?

[Darron Schall]

Looks like you also have to suppress param name changing. This is the secret sauce:

@Suppress("CONFLICTING_OVERLOADS", "PARAMETER_NAME_CHANGED_ON_OVERRIDE")

[ribesg]

If you don't actually use both functions then you just need @Suppress("PARAMETER_NAME_CHANGED_ON_OVERRIDE")

[ribesg]

I use this one in classes implementing UITableViewDelegateProtocol, I think it covers all the "this is possible in Swift/ObjC but not in Kotlin" issues you can sometimes have

@file:Suppress(
    "CONFLICTING_OVERLOADS",
    "PARAMETER_NAME_CHANGED_ON_OVERRIDE",
    "RETURN_TYPE_MISMATCH_ON_OVERRIDE"
)

[Trey]

Thank you