I dont know about IOS, but I've had good luck with a transparent webkit overlay on straight osx, using the approach from @admsyn:
https://github.com/admsyn/FITC-2014-slides
maybe the code / approach is a good place to look?
I dont know about IOS, but I've had good luck with a transparent webkit overlay on straight osx, using the approach from @admsyn:
https://github.com/admsyn/FITC-2014-slides
maybe the code / approach is a good place to look?