int vs NSNumber vs NSInteger

Question

I have a line of code that will work differently depending on the datatypes \"day\" and \"1\". I believe it is the following although I will check my source code later.

Answer 1

NSInteger is a simply an integer, NSNumber is an object where as int is a primitive data type.

NSInteger is nothing more than a synonym for a long integer.

If you need to store a number somewhere, use NSNumber. If you're doing calculations, loops, etc, use NSInteger, NSUInteger or int.

You can wrap an NSInteger into an NSNumber using:

NSNumber *NumberToStore = @(21);

and get it back using:

NSInteger retrievingInteger = [NumberToStore integerValue];