NSArray去除重复元素

 1     NSMutableArray *array = [NSMutableArray arrayWithObjects:@"1",@"2",@"2",@"4",@"5",@"6",@"7",@"8",@"9",@"0", nil];
 2    
 3     NSMutableArray *new = [NSMutableArray array];
 4     for (int  i = 0; i<[array count]; i++) {
 5         
 6         if ([new containsObject:[array objectAtIndex:i]] == NO) {
 7             [new addObject:[array objectAtIndex:i]];
 8         }
 9     }
10     NSLog(@"%@",new);

    NSMutableArray *array = [NSMutableArray arrayWithObjects:@"1",@"2",@"2",@"4",@"5",@"6",@"7",@"8",@"9",@"0", nil];
   

    NSSet *set = [NSSet setWithArray:array];
    NSLog(@"%@",[set allObjects]);