A Fragment Argument Delegate exmple

FragmentDelegates.kt

class FragmentDelegateTest : Fragment() {
    companion object {
        fun newInstance(someId: String) : FragmentDelegateTest {
            return FragmentDelegateTest().apply { this.someId = someId }
        }
    }
    
    private var someId: String? by fragmentArgument()

    override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        
        someId?.let { 
            callSomeApiOrSomethingIdontKnow(it)
        }
    }
}

inline fun <reified T> fragmentArgument() = object : ReadWriteProperty<Fragment, T?> {
    override fun setValue(thisRef: Fragment, property: KProperty<*>, value: T?) {
        with(thisRef) {
            if (arguments == null) arguments = Bundle()

            when (value) {
                is String -> arguments.putString(property.name, value)
                is Int -> arguments.putInt(property.name, value)
            // add more as needed.
            }
        }
    }

    override fun getValue(thisRef: Fragment, property: KProperty<*>): T? {
        val value = thisRef.arguments?.get(property.name)
        return when (value) {
            is T -> value
            else -> null
        }
    }
}