Cédric Luthi: Follow Cocoa conventions for methods without parameters returning errors, i.e. xxxAndReturnError:(NSError **)error instead of just xxx:(NSError **)error. The Cocoa APIs are inconsistent and use both patterns. Sometimes the error parameter is an NSError, other times an NSDictionary. I dislike the ambiguity of -save: and the verbosity of -saveAndReturnError: (which, incidentally, returns a BOOL), … Continue reading Cocoa NSError Conventions