iOS修改锚点后重置frame

//更改锚点

    func setViewAnchorPoint(view: UIView, anchorPoint: CGPoint) {
        view.layer.anchorPoint = anchorPoint
        view.top -= (0.5 - anchorPoint.y) * view.height
        view.left -= (0.5 - anchorPoint.x) * view.width
    }