if count != 0 {
    for i in stride(from: 0,to: Int(count!),by: 1) {
        if i==0 {
            let commodity = storeDetails?.storeSearchPickup.storeMaterialsDetails[i]
            let balesPicked: Int = (commodity?.balesPicked)!
            let balesRemaining: Int = (commodity?.balesRemaining)!
            commoditySection.balepickupedlabeltext.text = String(balesPicked)
            commoditySection.balesremaininglabeltext.text = String(balesRemaining)
            commoditySection.commodityLabel.font = UIFont.boldSystemFont(ofSize: 16.0)
            commoditySection.commodityLabel.text = commodity?.materialShortName
            commoditySection.setCommodity(details: commodity!,index: Int((commodity?.materialId)!))
            commoditySection.callback = self
            commoditiesViewCount = commoditiesViewCount+1
            print("commoditiesViewCount\(commoditiesViewCount)")
            self.currentSelectedCommodity = commodity
        } else {
            let commodity = storeDetails?.storeSearchPickup.storeMaterialsDetails[i]
            var commodityView = CommoditySection(frame:CGRect(x: 0,y: 0,width: commoditycontainer.frame.width,height:   CGFloat.leastNonzeroMagnitude));
            self.commoditycontainer.addSubview(commodityView)
            commodityView.setCommodity(details: commodity!,index: Int((commodity?.materialId)!))
            commodityView.translatesAutoresizingMaskintoConstraints = false
            commodityView.callback = self

            if(currentCommodityView != nil) {
                let verticalConstraint = NSLayoutConstraint(item: commodityView,attribute: NSLayoutConstraint.Attribute.top,relatedBy: NSLayoutConstraint.Relation.equal,toItem: self.currentCommodityView,attribute: NSLayoutConstraint.Attribute.bottom,multiplier: 1,constant: 0)
                let leading = NSLayoutConstraint(item: commodityView,attribute: NSLayoutConstraint.Attribute.leading,constant: 0)
                let trailing = NSLayoutConstraint(item: commodityView,attribute: NSLayoutConstraint.Attribute.trailing,constant: 0)
                NSLayoutConstraint.activate([verticalConstraint,leading,trailing])
                commodityheightconstraint.constant = commodityheightconstraint.constant + commodityView.frame.height
                print("commoditiesViewCount\(commoditiesViewCount)")

            } else {
                let verticalConstraint = NSLayoutConstraint(item: commodityView,toItem: self.commoditySection,trailing])
                commodityheightconstraint.constant =  commodityheightconstraint.constant + commodityView.frame.height

                print("commoditiesViewCount\(commoditiesViewCount)")

            }
            commodityView.commodityLabel.font = UIFont.boldSystemFont(ofSize: 16.0)
            commodityView.commodityLabel.text = commodity?.materialShortName
            let balesPicked: Int = (commodity?.balesPicked)!
            let balesRemaining: Int = (commodity?.balesRemaining)!
            commodityView.balepickupedlabeltext.text = String(balesPicked)
            commodityView.balesremaininglabeltext.text = String(balesRemaining)
            self.currentCommodityView = commodityView;
            commoditiesViewCount = commoditiesViewCount+1
            print("commoditiesViewCount\(commoditiesViewCount)")

            isSecondViewAdded = true
        }
    }
}

我是iOS开发的新手，但是经验丰富的Android开发人员 我有一个容器，需要在其中添加和删除视图 当我添加第一个视图时，它正确地适合容器；当在第一个视图下实用地添加另一个视图时，它覆盖了容器下的另一个视图 两种视图的高度均为CGFloat.leastNonzeroMagnitude 需要根据所包含的视图设置动态高度