Sorting Arrays

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The most flexible ways to sort an array is with the sortedArrayUsingComparator: method. This accepts an ^NSComparisonResult(id obj1, id obj2) block.

Return Value            Description
NSOrderedAscending      obj1 comes before obj2
NSOrderedSame           obj1 and obj2 have no order
NSOrderedDescending     obj1 comes after obj2

Example:

NSArray *categoryArray = @[@"Apps", @"Music", @"Songs",
                  @"iTunes", @"Books", @"Videos"];

 NSArray *sortedArray = [categoryArray sortedArrayUsingComparator:
^NSComparisonResult(id obj1, id obj2) {
 if ([obj1 length] < [obj2 length]) {
     return NSOrderedAscending;
 } else if ([obj1 length] > [obj2 length]) {
     return NSOrderedDescending;
 } else {
     return NSOrderedSame;
 }
}];

NSLog(@"%@", sortedArray);