滚动视图时更改标签位置

我在滚动视图外有一个标签。当滚动视图上下滚动时,我想将标签从屏幕的左向右移动,反之亦然。我写了这段代码,当滚动视图以正常速度滚动时,它就会工作,当滚动速度非常快时,标签x的位置变化非常缓慢。对于所有滚动视图滚动速度,我如何做到这一点?

func scrollViewDidScroll(_ scrollView: UIScrollView!) {

    let offset = scrollView.contentOffset.y
    let imahey = view.convert(placeImgview.frame, from:scrollview).origin.y + placeImgview.frame.width
    print(offset)
    let ratio: CGFloat = (-offset*1.0 / placeImgview.frame.height)
    topBarView.alpha =  -ratio
    if placeName.frame.origin.x < -20 {
        placeName.center = CGPoint(x: placeName.center.x - 3*ratio, y: placeName.center.y + ratio/1.5)
    }
    if (self.lastContentOffset > scrollView.contentOffset.y) {

            placeName.center = CGPoint(x: placeName.center.x + 6*ratio, y: placeName.center.y - 2*ratio)
        if offset == -20 {
            placeName.frame.origin.x = -view.frame.width/2
            placeName.frame.origin.y = 60
        }

    }

    self.lastContentOffset = scrollView.contentOffset.y
}