Sort NSMutableArray with strings that contain numbers?

Question

I have a NSMutableArray and it has the users high scores saved into it. I want to arrange the items numerically (the numbers are stored in NSStrings.)
Example:
4,2,7,8

Answer 1

If the array is of nsdictionaries conaining numeric value for key number

isKeyAscending = isKeyAscending ? NO : YES;

[yourArray sortUsingComparator:^NSComparisonResult(NSDictionary *obj1, NSDictionary *obj2) {

    NSString *str1 = [obj1 objectForKey:@"number"];
    NSString *str2 = [obj2 objectForKey:@"number"];

    if(isKeyAscending) { //ascending order
        return [str1 compare:str2 options:(NSNumericSearch)];
    } else { //descending order
        return [str2 compare:str1 options:(NSNumericSearch)];
    }
}];

//yourArray is now sorted