What Cocoa/Core Foundation helper functions do you wish you knew about 2 years ago?

Question

I just discovered the NSRect helper functions in NSGeometry.h (i.e. NSMidX, NSMaxX, etc...)

These would have made some repetitive coding much easier. I knew about NSMak

Answer 1

Creating a colour from a pattern image with

[UIColor colorWithPatternImage:[UIImage imageNamed:@"mypattern.png"]];