How Do I sort an NSMutable Array with NSNumbers in it?

Question

I\'m trying to make a high score table, and suck at arrays in objective c (actually, in general objective c is challenging for me), so I can\'t figure out how to sort. I\'m

Answer 1

This code will sort an NSMutableArray of NSNumber in ascending order:

[tempRA sortUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    return [obj1 compare:obj2];
}];

This code will sort an NSMutableArray of NSNumber in descending order:

[tempRA sortUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    return [obj1 compare:obj2] * -1; // reverse the enum
}];

The code uses the fact that the NSNumber compare: method returns an NSComparisonResult that ranges from -1 to 1. Multiplying the result of the compare by -1 reverses the result and thereby reverses the sort to descending order.