On 5 Nov 2008, at 4:21 pm, Steven Riggs wrote:
Thanks for the clarification Graham. It seems that retrieving data
ordered (rows and columns) the same as the view is a common task.
Apples solutions are pretty well thought out and encompassing so I
was surprised there was not an easier way to get it.
I think it is pretty well thought out, once you accept the wisdom of
sticking ruthlessly to MVC.
Typically a table's source data might be kept in a NSMutableArray held
by your controller, which is directly sortable using the sort
descriptors maintained by the table view. You can get the objects that
are selected using a line of code like this:
NSArray* selectedObjects = [mySortedListOfAllObjects objectsAtIndexes:
[myTableView selectedRowIndexes]];
I find it hard to imagine a much easier way to get it - the array and
table view classes dovetail really quite nicely! (And don't violate
MVC).
Using KVC in your datasource also dovetails very nicely, for example:
- (id) tableView:(NSTableView*) aTableView objectValueForTableColumn:
(NSTableColumn*) aTableColumn row:(int) rowIndex
{
return [[mySortedListOfAllObjects objectAtIndex:rowIndex]
valueForKey:[aTableColumn identifier]];
}
So straightforward, you'd almost think it was designed this way ;-)
cheers, Graham
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