Automatically increase the static height of a table cell to match the height of the label content

Here is a low quality mockup of my cell layout:

The starting height of the static cell (set in the storyboard) is 80. There are two views inside this cell. The bottom view has a height of 40. The top view has layout constraints to align to the top and vertically align to the bottom.

Inside the top view is a label (blue) and a button (yellow)

The label also has constraints for alignment to the top of the view and alignment at the bottom of the view. The idea behind this layout and constraints is that if I increase the cell height to 100, for example, the height of the bottom image stays at 40, and the top view and label height expand to 60.

My label has word wrap per line and line count of 0. What I now want is to automatically resize the cell to get the full content of the label when there are multiple lines. How can i do this?

I tried:

self.tableView.rowHeight = UITableViewAutomaticDimension;
self.tableView.estimatedRowHeight = 80.0;

      

        
        
        
      

    

This does not work. The cell height always remains independent of the number of rows in UILabel

.

I've also tried:

override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return UITableViewAutomaticDimension;
}

      

        
        
        
      

    

With the same result as my first approach.

The more complicated way I tried was this:

override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    let heightLabel = self.heightForView(text: self.lblTitle.text!, font: UIFont(name: "Helvetica Neue", size: 18)!, width: self.lblTime.width);
    let heightView = (heightLabel + (80.0 / 2));

    print("title label height \(heightLabel)");
    print("title view height \(heightView)");

    if (heightView > 80.0) {
        return heightView;
    }

    return 80.0;
}

func heightForView(text: String, font: UIFont, width: CGFloat) -> CGFloat {
    let label: UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: width, height: CGFloat.greatestFiniteMagnitude));
    label.numberOfLines = 0;
    label.lineBreakMode = .byWordWrapping;
    label.font = font;
    label.text = text;
    label.sizeToFit();

    return label.frame.height;
}

      

        
        
        
      

    

output:

title label height 42.5
title view height 82.5

      

        
        
        
      

    

But that also doesn't work as no other lines are displayed, only the first line of the label.

How can I get this to work?

EDIT

My guess is that the label height approach will work when I know the label width. But how am I supposed to know this?