Антон Цыканов

Developing small games for iPhones using SpriteKit:
Street Rush - http://codecanyon.net/item/street-rush/12697586 

Ink Mixer - http://codecanyon.net/item/ink-mixer/12043781 

Archer - http://codecanyon.net/item/archer/10917644
in all of these projects used objective-c and SpriteKit, SDK 8+ all small description and video on link

• Objective-C – middle level
• OOP – middle level
• Swift – middle level (improved)