should a singleton use self or shared instance inside the methods

Question

inside the singleton methods how should I use a singleton:

like:

     [self doMethod];

or:

    [[SingletonClass sharedSingleton] doMethod];

?

Answer 1

I can think of no reason to do it the second way. That way is longer, slower and more brittle -- and there's no upside to it. Just use self unless you have a really compelling reason to do otherwise. Singletons are essentially just normal objects.