Obscure Objective-C aside that you should never actually take advantage of: You don't actually need anything between colons in a method signature. for instanc

Obscure Objective-C aside that you should never actually take advantage of: You don't actually need anything between colons in a method signature. for instance, you could write: doStuff:arg1 :arg2 :arg3 The method signature would be something like: - (void) doStuff:(NSString )arg1 :(NSString )arg2 :(BOOL)arg3; So it's strictly a convention even in Obj-C that arguments are "named".