Personally for me, most of my frustration comes from iOS's UIKit and especially their entire UIViewController container class set. It's very fragile and picky.

Personally for me, most of my frustration comes from iOS's UIKit and especially their entire UIViewController container class set. It's very fragile and picky. Simple Objective-C is far less of a headache to deal with. Also as a side effect of practically being an apple hardware only environment and it being a compiled language, you don't have the option to create a 2 or 4 socket CPU beast to compile programs with.