swift 自动布局设置 tableview 的 tableHeaderView 的高度

class headerView: UIView {

    var whiteView = UIView().then {
        $.backgroundColor = UIColor.red
    }

    override init(frame: CGRect) {
        super.init(frame: frame)

        addSubview(whiteView)
        whiteView.snp.makeConstraints { (make) in
            make.left.top.right.equalToSuperview()
            make.bottom.equalTo(-)
            make.height.equalTo()
        }
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func layoutSubviews() {
        super.layoutSubviews()
    }
}

设置 tableHeaderView 的高度

        let v = headerView()
        let height = CGFloat(v.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize).height)
        v.frame = CGRect(x: , y: , width: kScreenWidth, height: height)
        tabelView.tableHeaderView = v