How to apply layout impacting state on node insertion (iOS, shadow nodes)

[alpha0010]

https://github.com/alpha0010/react-native-pdf-viewer/blob/b3e25ac5f4a035d80673d23efa4a556ebcafe82f/ios/PdfView.mm#L83

- (void)updateState:(const facebook::react::State::Shared &)state oldState:(const facebook::react::State::Shared &)oldState
{
    _view.readyToRender = oldState != nullptr; // Skip render until measurements sent to shadow node.
    _state = std::static_pointer_cast<const PdfViewShadowNode::ConcreteState>(state);
    [_view measurePdf]; // Sends results to `_state->updateState()`
    [super updateState:state oldState:oldState];
}

I hacked a guard that prevents the view from rendering until the second call to updateState(). Without this, the view will first render at the wrong dimensions, then the measurements sent to the shadow node will trigger a re-layout, and the view will re-render at the correct dimensions. So, I essentially skip insertion and wait for the second update before rendering. But this feels like it is depending on an implementation detail, not normal APIs.

Is this really the best way of handling shadow nodes with layout computed from props? This did not occur for me on the old architecture.