Delphi lets you do single codebase iOS, android, windows and mac native apps that render their ui to opengl and are therefore really fast.

Ofcourse, you have to write objectpascal, which is not a popular language, but once you get over the weirdness it is more productive than C++ while still giving you pure native software. It even has closures these days :)

http://www.embarcadero.com/products/delphi