テキスト大文字/小文字を区別しない　abc 順に並べる「caseInsensitiveCompare」
[php]
NSArray *fruits = @[@"meron", @"peach", @"apple", @"orange"];
NSArray *sortedFruits = [fruits sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];
NSLog(@"%@", sortedFruits);
[/php]

sortedArrayUsingDescriptorsメソッド昇順／降順の並び替え ascending 昇順／降順　YES/NO
[php]
NSArray *fruits = @[@"meron", @"peach", @"apple", @"orange"];
NSArray *sortedFruits = [fruits sortedArrayUsingDescriptors:@[[NSSortDescriptor sortDescriptorWithKey:@"" ascending:NO]]];
NSLog(@"%@", sortedFruits);
[/php]