DetectScrolling

  func scrollViewDidScroll(scrollView: UIScrollView) {
    if scrollView.contentOffset.y <= pointNow {
      // Up
      UIView.animateWithDuration(
        0.0,
        delay: 0.0,
        options: .CurveEaseOut,
        animations: {
          self.addToProfileBtn.center.y = 32
        },
        completion: nil
      )
    } else if scrollView.contentOffset.y >= pointNow {
      // Down
      UIView.animateWithDuration(
        1.5,
        delay: 0.25,
        options: .CurveEaseIn,
        animations: {
          self.addToProfileBtn.center.y -= 64
        },
        completion: nil
      )
    }
  }