按NSDate对NSTableColumn进行排序

Question

I have table in table there is a column with dates in format of dd/MM/yy the entries are in NSString , now after clicking on the column header ie sort Descriptor icon column should get sort ascending or descending depending on sort Descriptor. In present its sorting in numeric order for example like

1. 10/23/13
2. 11/4/09
3. 5/2/06

But I want the columns should have sorted by date:

1. 5/2/06
2. 11/4/09
3. 10/23/13

I have written following code

- (void)tableView:(NSTableView *)tableView sortDescriptorsDidChange:(NSArray *)oldDescriptors
{
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"date" ascending:YES];
    [fifiMainList sortUsingComparator:^NSComparisonResult(id a, id b) {

    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat: @"yyyy MM dd"];

    NSString *date1String = [a valueForKey:@"date"];
    NSString *date2String = [b valueForKey:@"date"];

    NSDate *date1 = [dateFormat dateFromString:date1String];
    NSDate *date2 = [dateFormat dateFromString:date2String];
    return [date1 compare:date2];
    }];
}

But it's not working for me.

Do I need to write sorting code in sortDescriptorsDidChange or somewhere else? and I also need sortDescriptorsDidChange method in my project.

Answer 1

Try like this :-

NSArray *yourArr=[NSArray arrayWithObjects:@"10/23/13",@"11/4/09",@"5/2/06",nil];
NSDateFormatter *format=[[[NSDateFormatter alloc]init]autorelease];
[format setDateFormat:@"dd/mm/yy"];
NSMutableArray *arr2=[NSMutableArray array];
for (NSString *str in yourArr)
{
    [arr2 addObject:[format dateFromString:str]];
}
    NSLog(@"Before=%@",arr2);
[self.arr sortUsingSelector:@selector(compare:)];
    NSLog(@"After=%@",self.arr);