Sorry, I misread what you have. Anyway, iOS is the operating system for iPad, iPhone, iPod touch and AppleTV.
A 13" MacBook Pro bought a year and half ago, would be early 2013 MacBook Pro or a Retina 2012. It does support higher scaled resolutions:
http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-i5-2.5- 13-late-2012-retina-display-specs.html
http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-i7-3.0- 13-early-2013-retina-display-specs.html
If neither of these appear to be your machine, use this tip to identify your Mac:
https://discussions.apple.com/docs/DOC-6413
Something tells me you don't have the 13" Model pro that is from that time frame. But first you must properly identify your Mac.