trying to animate a constraint in swift

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I have a UITextField that I want to enlarge its width when tapped on. I set up the constraints and made sure the constraint on the left has the lower priority then the one that I am trying to animate on the right side.

Here is the code that I am trying to use.

// move the input box
UIView.animateWithDuration(10.5, animations: {
    self.nameInputConstraint.constant = 8
    }, completion: {
        (value: Bool) in
        println(">>> move const")
})

This works, but it seems to just happen instantly and there doesn’t seem to be any movement. I tried to set it 10 seconds to make sure I wasn’t missing anything, but I got the same results.

nameInputConstraint is the name of the constraint that I control dragged to connect into my class from IB.

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