Dynamic row heights for NSTableView

Question

Hi everyone,
I just began writing OSX apps not too long ago. I'm having trouble with dynamically setting my row heights for an NSTableView. I've seen a really old solution where the subclass the view but I also found a solution posted by Corbin on Stack Overflow. However, I don't quite understand and am hoping someone has sample code?
For my usecase, I have a list of text of varying lengths and are displayed in a multi-line text field. The rows for the table cut off the text and so I'm trying to resize them to fit the text. When I check on the setRowSizeStyle to custom - it defaults to 71 and is fixed at 71. I hope someone can help me out. I think the solution posted by Corbin should solve my problem but I have no idea how to implement it.
Thanks

Answer 1

Etresoft, the function that you gave me for some reason constantly calculates the height as 39. Minus the fudge factor of 25 means I'm constantly getting 14 for my height for all rows and some of the text is cut off. I think it might be because I'm passing in the wrong size into my NSTextContainer.
Here's my code right now:
- (CGFloat)tableView:(NSTableView *)tableView heightOfRow:(NSInteger)row
    Message *message = [thread objectAtIndex:row];
    NSTableColumn *tableColoumn = [conversationView
                                   tableColumnWithIdentifier:@"tableColumn"];
    if (tableColoumn)
        NSCell *dataCell = [tableColoumn dataCell];
        [dataCell setWraps:YES];
        [dataCell setStringValue:message.message];
        CGFloat height = [self calculateIdealHeightForSize:[dataCell cellSize] content:message.message];
        NSLog(@"Message: %@ Height: %f", message.message, height);
        return height;
    NSLog(@"No size found. Returning default size for 100.");
    return 100;
- (CGFloat) calculateIdealHeightForSize: (NSSize) size content: (NSString *) content
    NSTextStorage * storage =
    [[NSTextStorage alloc] initWithAttributedString:[[NSAttributedString alloc] initWithString: content ]];
    NSTextContainer * container =
    [[NSTextContainer alloc] initWithContainerSize: size];
    NSLayoutManager * manager = [[NSLayoutManager alloc] init];
    [manager addTextContainer: container];
    [storage addLayoutManager: manager];
    [manager glyphRangeForTextContainer: container];
    NSRect idealRect = [manager usedRectForTextContainer: container];
    // Include a fudge factor.
    return idealRect.size.height + 25;