id means a reference to anobjective-cobject of which the class is unknown. For
your example you could also use:
+ (MyManager *)sharedManager;
Майце на ўвазе, што вы не выкарыстоўваеце
+ means it's a class-method: a method you call on a
[NSString stringWithFormat:@"%d", 1].
- is an instance method, a method you call on an
object instance of a class, like '[myString length]'