Fix[iOS]: get visit bounds

[pranshuchittora]

Description

Fixes runtime exception in getVisibleBounds (iOS only)

Added your feature that allows ...

Checklist

• I've read CONTRIBUTING.md
• I updated the doc/other generated code with running yarn generate in the root folder
• I have tested the new feature on /example app.
  • In V11 mode/ios
  • In New Architecture mode/ios
  • In V11 mode/android
  • In New Architecture mode/android
• I added/updated a sample - if a new feature was implemented (/example)

Screenshot OR Video

Component to reproduce the issue you're fixing