After experimenting with various onscreen indicators for swiping, I decided I just didn’t like it.  On certain resolutions the screen was just too crowded.  I even experimented with putting indicators on the side.  Still it seemed too much.  So I decided to just remove them.  
I did replace the pinch/zoom code with the swipe up/down code and liked the results.  But I may wait until I port the whole code base to Unity before I post another update.

After experimenting with various onscreen indicators for swiping, I decided I just didn’t like it.  On certain resolutions the screen was just too crowded.  I even experimented with putting indicators on the side.  Still it seemed too much.  So I decided to just remove them.  

I did replace the pinch/zoom code with the swipe up/down code and liked the results.  But I may wait until I port the whole code base to Unity before I post another update.