[objective-c] Capitalize or change case of an NSString in Objective-C

I was wondering how to capitalize a string found in an object in an NSMutableArray.

An NSArray contains the string 'April' at index 2.
I want this to be changed to 'APRIL'.

Is there something simple like this?

viewNoteDateMonth.text  = [[displayDate objectAtIndex:2] capitalized];

In case anyone needed the above in swift :

SWIFT 3.0 and above :

this will capitalize your string, make the first letter capital :

viewNoteDateMonth.text  = yourString.capitalized

this will uppercase your string, make all the string upper case :

viewNoteDateMonth.text  = yourString.uppercased()

viewNoteDateMonth.text  = [[displayDate objectAtIndex:2] uppercaseString];

Documentation: http://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/occ/instm/NSString/uppercaseString

You can also use lowercaseString and capitalizedString