iOS: Boolean Confusion

There is BOOL, bool, and Boolean, and then there is YES/NO, true/false, and TRUE/FALSE.

For Objective C, use BOOL and YES/NO. The rest are probably for compatibility with C code. Most of the time they seem to be usable interchangeably though, but just to be on the safe side, stick to what Objective C defines.

References:

• http://stackoverflow.com/questions/541289/objective-c-bool-vs-bool
• http://stackoverflow.com/questions/615702/is-there-a-difference-between-yes-no-true-false-and-true-false-in-objective-c