How to get label name from Button?

If you are sure that titleLabel is not nil:

println(TheButton.titleLabel!.text)

else

if let text = TheButton.titleLabel?.text {
    println(text)
}

More simply, you could just do:

let titleValueString = TheButton.currentTitle!

If the button's title is not nil, the exclamation point (!) will implicitly unwrap the optional (currentTitle without the exclamation point) and you will have a string value for the title of the button in your constant, titleValueString