title: How to know the useful height of an iOS device in React Native?
body: <p>In some very specific cases I need to set the height of a View to the full height of the device useful area (without using flex).</p>
  
  <p>I was using a hardcoded "notch height" to calculate this useful height but I just discovered that the notch can have different heights depending on the device. (3 points of difference between iPhone XS and iPhone XS Max).</p>
  
  <p>Is there a way to know the useful height of a device with notch and safe area?</p>