This is a bit of a cool development for iPhone users and emulation. Since earlier this year Apple has became more welcomed to emulation apps launching at the App store. A reddit user has shared their vision of what a pocketable gaming controller attachment for iPhone users could be like. The concept it's self looks pretty neat, and not as bulky as a kishi or a gamesir attachment.
https://www.iospocketplay.com/
KickStarter
Original Reddit post
https://www.iospocketplay.com/
KickStarter
Original Reddit post