title: What Cocoa/Core Foundation helper functions do you wish you knew about 2 years ago?
body: <p>I just discovered the NSRect helper functions in NSGeometry.h (i.e. NSMidX, NSMaxX, etc...)</p>
  
  <p>These would have made some repetitive coding much easier.  I knew about NSMakeRect, NSMouseInRect, NSOffsetRect and many others but somehow missed the functions that aid in recalculating NSRect geometry.</p>