How to set second column text of NSTableView?

Question

I've encountered a problem while creating an NSTableView with 2 columns.

How do you set the value of the a row's corresponding column? I would like to have colText to be in the row's column, but it seems nearly impossible to achieve.

Here's the code:

 - (id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)aTableColumn row:(int)rowIndex {
    uint32_t size = *((uint32_t *)[[itemSizes objectAtIndex:rowIndex] bytes]);
    NSString *colText = [NSString stringWithFormat:@"%d bytes", size];

    return [objNames objectAtIndex:rowIndex];
}

I would like [objNames objectAtIndex:rowIndex] to be in the left column, which it is, and colText on the right?

I'm a bit stuck.

Any help appreciated.

“the row's column”? Each column is queried for each row. — Peter Hosey, Aug 20 '11 at 07:44

Rudy Velthuis · Accepted Answer · 2011-08-20T07:53:19.170

2

Give the columns identifiers (e.g. @"firstColumnID" and @"secondColumnID") so you can do:

- (id)tableView:(NSTableView *)aTableView 
      objectValueForTableColumn:(NSTableColumn *)aTableColumn 
      row:(NSInteger)rowIndex
{
    if ([[aTableColumn identifier] isEqualToString: @"firstColumnID"])
        return [objNames objectAtIndex: rowIndex];
    else 
    {
        // In the original code, NSData was used, but for simple values
        // like this, NSNumbers are better suited, IMO:
        NSUInteger size = [[itemSizes objectAtIndex: rowIndex] unsignedIntegerValue];
        return [NSString stringWithFormat: @"%lu bytes", size];
    }
}

edited Aug 20 '11 at 07:53

answered Aug 20 '11 at 06:00

Rudy Velthuis

28,387
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Worth pointing out: You've also changed the interpretation of `itemSizes` from an array of NSData objects to an array of NSNumber objects. A virtuous change that must be reflected elsewhere in the code (i.e., wherever the array is populated). – Peter Hosey Aug 20 '11 at 07:48
@Peter: Thanks, I always mix these up. – Rudy Velthuis Aug 20 '11 at 07:50
@Peter: Oops. I guess I'll change it back or add a comment in the code. – Rudy Velthuis Aug 20 '11 at 07:51

score 0 · Answer 2 · edited May 23 '17 at 12:07

0

Another option, with less coding and without bindings is to set the column identifiers to be the same as class properties. You can dispense with the if/else in that case.

there is more on this topic here:

NSTableView with multiple columns

edited May 23 '17 at 12:07

Community

1
1

answered Nov 02 '12 at 00:21

Daniel Saban

478
3
16

score 0 · Answer 3 · answered Aug 20 '11 at 05:47

Two options:

Update your code and user interface to use bindings: add a method -formattedSize and then add an NSArrayController to the NIB, bind the array controller to your data array, and then bind the table column to arrangedObjects.description and arrangedObjects.formattedSize.
or use NSTableColumn to differentiate the data returned.

e.g.

- (id)tableView:(NSTableView *)tableView
      objectValueForTableColumn:(NSTableColumn *)tableColumn
      row:(int)row
{
    id value = nil;

    if ([[tableColumn identifier] isEqualToString:@"column1"])
    {
        value = [arrayA objectAtIndex:row];
    }
    else
    {
        value = [arrayB objectAtIndex:row];
    }

    return value;
}

How to set second column text of NSTableView?

3 Answers3