What does it mean when you put an @ before an integer in Objective-C?

Question

What does it mean when you put an @ before an integer in Objective-C? Like so:

@4

Rattlepate

It makes it an NSNumber. – Grievance

See "NSNumber Literals" in clang.llvm.org/docs/ObjectiveCLiterals.html. – Monophyletic

Note that this is a relatively new compiler feature, so many books and other references will not discuss it. It goes with the notation of @[a,b,c] for an NSArray and several other enhancements, as shown in Martin R's link. – Thunder

Does this answer your question? What does the @ symbol represent in objective-c? – Welltodo

Answer 1

It is the NSNumber literal. A shortcut for this:

[NSNumber numberWithInt:4];

Tiein

Do you know its equivalent in swift 2.3 and swift 3.0? – Clawson

You should probably use the Swift numeric types instead, like Int, Float etc. If you really need to use NSNumber in Swift, you can do it like this: var num = NSNumber(value: 4) – Tiein