“Unrecognized selector sent to instance” in swift

Question

I have no idea what I am doing wrong. I am also quite new to programming so I am not very good at debugging. This was a test app so that I can see how swift ties in with app

Answer 1

func buttonAction(){...

should be

func buttonAction(sender:UIButton!)
{
    println("tapped button")
}

Because of newButton's action: "buttonAction:" so.