How to make NSTableView scroll to most recently added row?

Question

I'm dynamically adding rows to an NSTableView. When I issue [table reloadData] I can see the scroll view move and if I move it by hand I can see the new value on the table. But how can I scroll it automatically?

Solution 1

NSInteger numberOfRows = [tableView numberOfRows];

if (numberOfRows > 0)
    [tableView scrollRowToVisible:numberOfRows - 1];

Assuming you're adding rows to the end of the table.

(The reason I ask the table view for the number of rows instead of the data source is that this number is guaranteed to be the number of rows it knows about and can scroll to.)

Solution 2

Use something like this:

 [table scrollRowToVisible:indexOfNewRow];

Solution 3

I solved it as shown below, using the didAddRowView to work properly: Obviously, if I add a new record, the tableview needs to create a new row view.

- (void)tableView:(NSTableView *)tableView  didAddRowView:(NSTableRowView *)rowView forRow:(NSInteger)row {
// it sends notification from all tableviews.
// I am only interested in the dictionary...

if (tableView == dictTableView){
    if ( row == [dictTableView numberOfRows]-1){
        [dictTableView scrollRowToVisible:row];
    }
}

}

But also, in my IBAction I added 2 lines after performing the add statement to the controller

- (IBAction)addNewDictItem:(id)sender {
NSInteger row=[[theDictArrayController arrangedObjects]count];

[theDictArrayController add:sender];
[dictTableView noteNumberOfRowsChanged];
[dictTableView scrollRowToVisible:row-1];

}

Comments

[Abizern]

+1 because this way handles the usual case where table sorting means that the new row isn't necessarily at the bottom of the table.

[SpacyRicochet]

Somehow (on the latest XCode and SDK) this causes the tableView scroll to the cell just before the newly added cell (added at the end of the tableView). Can't figure out why.

[Chris Hillery]

It might depend on how soon you call it; maybe try adding [tableView noteNumberOfRowsChanged]; before it.

[SpacyRicochet]

Thanks, will try that. Right now I got it working by putting [tableView reloadData] in front of it.