Swift calling subclass's overridden method from superclass

Question

I was having an issue with a subclass's method getting called that overrode a method, so I created a small app to test it. When the superclass calls a method that its subclass overrides, the superclass's version of the method still gets called instead of the subclass's version, which overrides the superclass's method and should be the method getting called.

Expected output: sub foo

Actual output: super foo

Superclass:

class ViewController: UIViewController
{
    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent)
    {
        foo()
    }

    func foo()
    {
        println("super foo")
    }
}

Subclass:

class SubclassViewController: ViewController
{
    override func foo()
    {
        println("sub foo")
    }
}

Answer 1

Make sure that the object's class is SubclassViewController. Otherwise, it will not have any knowledge of the method which is overriden by subclass