Get the keyboard frame in Swift

func keyboardWillChangeFrame(notification: NSNotification) {
    // Add this in to your code:
    // NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(keyboardWillChangeFrame), name: UIKeyboardWillChangeFrameNotification, object: nil)
    
    let keyboardFrame = notification.userInfo![UIKeyboardFrameEndUserInfoKey]!.CGRectValue

    // Do something with it
}