Kotlin Property Delegate for Fragment view lifecycle binding

ViewLifecycleBinding.kt

fun <T> Fragment.viewLifecycle(bindUntilEvent: Lifecycle.Event = Lifecycle.Event.ON_DESTROY): ReadWriteProperty<Fragment, T> =
        object: ReadWriteProperty<Fragment, T>, LifecycleObserver {

            // A backing property to hold our value
            private var binding: T? = null

            private var viewLifecycleOwner: LifecycleOwner? = null

            init {
                // Observe the View Lifecycle of the Fragment
                this@viewLifecycle
                    .viewLifecycleOwnerLiveData
                    .observe(this@viewLifecycle, Observer { newLifecycleOwner ->
                        viewLifecycleOwner
                            ?.lifecycle
                            ?.removeObserver(this)

                        viewLifecycleOwner = newLifecycleOwner.also {
                            it.lifecycle.addObserver(this)
                        }
                })
            }

            @OnLifecycleEvent(Lifecycle.Event.ON_ANY)
            fun onDestroy(event: Lifecycle.Event) {
                if (event == bindUntilEvent) {
                    // Clear out backing property just before onDestroyView
                    binding = null
                }
            }

            override fun getValue(
                thisRef: Fragment,
                property: KProperty<*>
            ): T {
                // Return the backing property if it's set
                return this.binding!!
            }
            override fun setValue(
                thisRef: Fragment,
                property: KProperty<*>,
                value: T
            ) {
                // Set the backing property
                this.binding = value
            }
        }
    }

    override fun setValue(thisRef: Any, property: KProperty<*>, value: T) {
        this.property = value
    }
}