How do I declare a weak variable with the expect/a...

# multiplatform

[myrronth]

How do I declare a weak variable with the expect/actual pattern that also becomes a weak variable when used in Swift? I’ve tried actual var listener: WeakReference<T>? = null and updated my calls to listener?.get()?.method(). But once I use my shared code in Swift, the listener variable is not the expected weak var listener: T but a wrapped KotlinWeakReference. If I use this, it is the same as without – the value assigned to listener, a UIViewController, does not get deallocated once all the references in the concrete implementation are gone (the view controller gets dismissed and should not receive further messages from the listener)

[AnaR]

I wrote one for my project. Common was the minimal i needed: expect class WeakRef<T:Any> (referred:T) {
fun get(): T?
}

[AnaR]

Android Implemenation: actual typealias WeakRef<T> = WeakReference<T>

[AnaR]

And ios impl: actual class WeakRef<T:Any> actual constructor(referred:T) {
val delegate:WeakReference<Any>
init {
delegate = WeakReference(referred)

}
actual fun get(): T? {
return delegate.get() as? T
}
}

[AnaR]

I remember I had a similar memory leak as you described that went away after.

[myrronth]

Thanks! In the meantime, I solved it using a proxy object in iOS (outside the lib) that holds a weak var to my controller. The proxy objects lifetime depends on the memory management of kotlin, but at least the memory-heavy ViewController gets released once the controller is no longer used.