another option is just keep the assets as SVG's and use a library to do the conversion (ios/osx specifically, I personally use SVGKit - https://github.com/SVGKi

another option is just keep the assets as SVG's and use a library to do the conversion (ios/osx specifically, I personally use SVGKit - https://github.com/SVGKit/SVGKit https://github.com/SVGKit/SVGKit )