1. /// 创建单个热门项目itemView    private func creatProcduceItemView(producrName: String , producePrice: String) -> UIView {        let item = UIView()        item.translatesAutoresizingMaskIntoConstraints = false        let produceLab = JYBaseViewModel.creatLabe(text: producrName, font: UIFont.systemFont(ofSize: 16), textColor: UIColor.init(hexColor: "9B9B9B"))        let priceLab = JYBaseViewModel.creatLabe(text: "¥ " + producePrice.decimalPointCount(), font: UIFont.systemFont(ofSize: 16), textColor: UIColor.init(hexColor: "9B9B9B"))        item.addSubview(produceLab)        item.addSubview(priceLab)        let vd: [String: UIView] = ["produceLab": produceLab ,                                    "priceLab": priceLab]        item.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "|[produceLab]", options: [], metrics: nil, views: vd))        item.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "[priceLab]|", options: [], metrics: nil, views: vd))        item.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[priceLab]|", options: [], metrics: nil, views: vd))        item.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[produceLab]|", options: [], metrics: nil, views: vd))        return item    }

　　

2.  /// 根据数组创建数量    func setitemsBgViewSubViews(itemsArr : [String]){                //添加之前移除所有 添加的控件        itemsBgView.subviews.forEach({$0.removeFromSuperview()})                /// 布局热门项目的view        for (i, _) in itemsArr.enumerated(){                        let itemView = self.creatProcduceItemView(producrName: itemsArr[i], producePrice: "38.0")            itemsBgView.addSubview(itemView)                        let vd: [String: UIView] = ["itemView": itemView]            let metrics: [String: Any] = ["top": CGFloat(i) * 30]            itemsBgView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "|[itemView]|", options: [], metrics: nil, views: vd))            itemsBgView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-top-[itemView(30)]", options: [], metrics: metrics, views: vd))            if i == itemsArr.count - 1 {                itemView.bottomAnchor.constraint(equalTo: itemsBgView.bottomAnchor).isActive = true            }        }    }

3. 父控件设置约束self.fastAddConstraints("|-24-[itemsBgView]-24-|", vd)注意：如果这里父控件是在scrollview 上， 这里宽度要自己设置为屏幕宽度self.fastAddConstraints("|-24-[itemsBgView(屏幕宽度)]-24-|", vd)