NSTableView hiding rows off screen

Question

I have a NSTableView which works fine except that it only shows a screen's worth of data. I've checked as it loads and all data is in the source Arrays (3 columns = 3 Mutable Arrays). All rows seem to be there but, when I scroll up (or down, depending on your viewpoint), the rows that were off-screen are blank.

I increased the height of the Table View and more data appeared but with the same effect for off-screen rows. In fact, I built the table by copying from an earlier version which works fine - and I've done a comparison of properties and can't see any differences.

Any ideas. I'm happy to add code but I'm not even sure what to show you.

To confirm build, the tableView code:

- (NSString *) returnedValue: (NSString *) keyName forRow: (NSUInteger) row
{
    if( [keyName isEqualToString: Col1Id] )
    {
        return [actuelColDesc objectAtIndex: row];
    }
    else if( [keyName isEqualToString: Col2Id] )
    {
        return [actuelColSing objectAtIndex: row];
    }
    else if( [keyName isEqualToString: Col3Id] )
    {
        return [actuelColPlur objectAtIndex: row];
    }
    return nil;
}

#pragma mark - Table View Data Source

- (NSInteger) numberOfRowsInTableView:(NSTableView *)tableView
{
    return self.actuelColDesc.count;
}

- (id) tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row
{
    return [self returnedValue: tableColumn.identifier forRow: row];
}

Populating method:

- (void) doPopulateTable:exportedTable withTitle: (NSString *) titleString andWord: (NSString *) reportedWord sizingFlag: (NSUInteger) sFlag
{
    NSUInteger size1, size2, size3;
    NSRect tableFrame;

    currentVoice = 1;
    noOfArrays = [exportedTable count];
    if( noOfArrays > 6 )
    {
        switch (currentVoice)
        {
            case 1:
                actuelColDesc = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:0]];
                actuelColSing = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:1]];
                actuelColPlur = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:2]];
                reportParseSing = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:7]];
                reportParsePlur = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:8]];
                break;
            case 2:
                actuelColDesc = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:0]];
                actuelColSing = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:3]];
                actuelColPlur = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:4]];
                reportParseSing = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:9]];
                reportParsePlur = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:10]];
                break;
            case 3:
                actuelColDesc = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:0]];
                actuelColSing = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:5]];
                actuelColPlur = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:6]];
                reportParseSing = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:11]];
                reportParsePlur = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:12]];
                break;
            default:
                break;
        }
    }
    else
    {
        actuelColDesc = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:0]];
        actuelColSing = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:1]];
        actuelColPlur = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:2]];
        reportParseSing = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:3]];
        reportParsePlur = [[NSMutableArray alloc] initWithArray:[exportedTable objectAtIndex:4]];
    }
    if( noOfArrays == 14 )
    {
        [btnBaseMiddle setHidden:NO];
        [btnBasePassive setHidden:NO];
    }
    [reportTable reloadData];
    if( sFlag == 2 )
    {
        size1 = 686;
        size2 = 644;
        size3 = 320;
    }
    else
    {
        size1 = 524;
        size2 = 474;
        size3 = 150;
    }
    tableFrame = [[self window] frame];
     tableFrame.size.width = size1;
     [[self window] setFrame:tableFrame display:YES];
     tableFrame = [[self reportTable] frame];
     tableFrame.size.width = size2;
     [[self reportTable] setFrame:tableFrame];
     [[self column1] setWidth:size3];
     [[self window] setTitle:[NSString stringWithString:titleString]];
}

(The run that I'm using for debug has 107 rows - i.e. the arrays each have 107 objects.)

Properties of the TableView include the following: View Based, Floats Group Rows (YES), Trancates Last Visible Line (NO), State Enabled (YES), Autoresizes Subviews (YES).

Can you please show in the images that what you need and what you are getting? — shivi_shub
What happens if you return 107 in numberOfRowsInTableView and @"Test" in objectValueForTableColumn ? Do you get any empty cells? — koen
shivi_shub, I tried adding images but Stack Overflow objected. I'll try again: I'm new to Stack Overflow so I may have misunderstood. — Leonard Clark
Strangely, things have kind of moved on. I worked out that it seems to be something to do with the initialisation of the Class: debugging it resulted in some Outlets showing as nil. So I: a) added code to the class initialiser to copy back to AppDelegate self (the class address); b) having initialised the class, my calling code used the passed back address rather than the address returned from the initialisation method. It worked! Why? Who knows? — Leonard Clark
However, that was late in the day. I came back to it this morning to discover that I had populated and showed the window twice, once for each variable I was holding. No matter which of the two I used, when I removed one, something was missing. Bizarre or what? Having restored code to the original, the TableView now works! (Image to follow - I hope). However, some buttons are still showing as nil. The only thing that I can think of is that I did a straight build (without debug). — Leonard Clark

Leonard Clark Leonard Clark · Accepted Answer · 2018-08-07T12:19:47

Apologies to shiva_shub and Koen for wasting their time: it would seem that some of the objects window controller were not being activated until I show-ed the window. So, once I put the population code after showing the window, all worked fine. I assumed that, since I initialised with nib, all Outlets and Actions would have been instantiated too.

Thanks to my commentators for their help.

NSTableView hiding rows off screen

1 Answers