Adding buttons to toolbar programmatically in swift

Question

I\'m having a hard time adding a button to the toolbar in swift, below you can see an image of the toolbar that I\'m after, unfortunately even though I have it designed in my St

Answer 1

let addButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Add, target: self, action: "addSomething:")
toolbarItems = [UIBarButtonItem(barButtonSystemItem: .FlexibleSpace, target: self, action: nil),addButton]
self.navigationController!.setToolbarHidden(false, animated: false)