Design in 1x, but make sure all your assets can be exported in vector or retina images.
In case of images (in Photoshop): - use images that are large enough for @2x / @3x - past them in full resolution in design and turn them into smart objects
When design is finished, export all your assets in @1x, @2x and @3x.
Design in 1x, but make sure all your assets can be exported in vector or retina images.
In case of images (in Photoshop): - use images that are large enough for @2x / @3x - past them in full resolution in design and turn them into smart objects
When design is finished, export all your assets in @1x, @2x and @3x.
Done.