Question

According to Apple…
https://developer.apple.com/library/content/samplecode/URLCache/Listings/Classes_URLCacheConnection_m.html

…we should do:
if ([response isKindOfClass:[NSHTTPURLResponse self]])

Is it the same as doing if ([response isKindOfClass:[NSHTTPURLResponse class]])?

Answer 1

Ok, Martin R‘s comment is right, it’s the same.
For any class, I can do either [ClassName self] or [ClassName class] for the same result.
And I can override both of them:

+ (Class)class
{
    return [super class];
}
+ (id)self
{
    return [super self];
}

In fact, all NSObject instance methods (-) become class methods (+) for a Class.

Pro about manipulating ‘self’:

• we are directly manipulating a Class, so no need to ask for the class of a Class

Con about manipulating ‘self’:

• it is low-typed as ‘id’.