I just throw some technical questions out here. Note Ray Wenderlich has a series on this. BlackPixel has an article too.
life cycle of UIViewController;
NSString property copy or retain?
frame vs bounds
category vs subclass
What is protocol (Apple doc; Ry’s Objective-C tutorial)? Create a protocol for List, and how to implement the “add” method for linked list (stackoverflow)?
block (how to avoid memory issue);
To be continued…