Question

I just started a new project in xCode and saw this lines in the app delegate:

self.tabBarController.viewControllers = @[viewController1, viewController2];

I understand this is an array but It is new to me in Obj-C.

Can anybody explain where this syntax coming from ?

Answer 1

This is a new syntax that has been recently added to Objective C. There is also a new syntax for NSNumbers, NSDictionarys, and accessing arrays with square brackets:

NSNumber *fortyTwo = @42;

NSDictionary *dict = @{ @"key1" : @1.23,  @"key2" : @4.56};

NSMutableArray *array = ...;
id newObject = ...;
array[123] = newObject;