Adding further control elements in code

Let's now add a button, programmatically of course, with which the user can alphabetically sort the table view's rows and the underlying data.

Adding the sort button

Firstly, we need to build the button itself.

Add the following method inside the buildUI method of the ViewController class:

    func addSortButton() 
    { 
      let frame = CGRect(x: 268, 
                         y: 178, 
                         width: 192, 
                         height: 32) 

      let sortButton = NSButton(frame: frame) 

      sortButton.bezelStyle = .rounded 
      sortButton.title = "Sort" 

      view.addSubview(sortButton) 
    } 

And add a call to that method within the buildUI method:

    addTable() 
    configureTable() 
    addInfoLabel() 
    addSortButton() 

The interface should now look as follows:

It's a fine looking button, but it doesn't do anything yet. For this, we need to add a target and an action to the button.

Add the following lines of code to the...