Summary:
There is a problem rendering text shadows on iOS. If the offset of the text shadow is `{width:0,height:0}`, the shadow does not display. This prevents you from representing a light directly above the text. This occurs because a text shadow only renders if the offset is a non-zero CGRect `{width:0,height:0}`.
My change checks `textShadowRadius` instead. If `textShadowRadius` is not nan then the user is rendering a text shadow. There are no situations to render a shadow without `textShadowRadius` making it a good variable to check.
This PR fixes this stale issue: https://github.com/facebook/react-native/issues/17277
[iOS] [Fixed] - Text shadow now displays when the textShadowOffset is {width:0,height:0}
Pull Request resolved: https://github.com/facebook/react-native/pull/24398
Differential Revision: D14890768
Pulled By: cpojer
fbshipit-source-id: a43b96a4a04a5603eede466abacd95c010d053e5
17a81be40d