iOS - UIView 不显示在 UIStackView 内

Question

我有一个UIStackView，它需要在其中一个堆栈中添加背景颜色，所以我在其中放置了一个UIView，但UIView 从未显示。 UIView 当前有一个子视图UILabel，但最终应该有另一个UIStackView。如果我将UILabel 显示为UIStackView 的直接子代，而不是UIView，则UILabel 会正确显示。那么，我的UIView 缺少哪些约束或错误？

                        let stack = UIStackView()
                        stack.axis = .Vertical
                        stack.alignment = .Leading
                        stack.distribution = .EqualCentering
                        stack.spacing = 0

                        let width = UIScreen.mainScreen().bounds.size.width

                        let frame = CGRect(x: 0, y: 0, width: width, height: 50)
                        let viewHolder = UIView(frame: frame)
                        viewHolder.backgroundColor = blueColor

                        //Needs a blue background
                        let name = UILabel()
                        name.text = nameText
                        name.textColor = yellowColor
                        name.backgroundColor = blueColor
                        name.font = UIFont.boldSystemFontOfSize(32.0)                        

                        let address = UILabel()
                        address.text = addressText

                        let dateTime = UILabel()
                        dateTime.text = calString

                        viewHolder.addSubview(name)
                        stack.addArrangedSubview(viewHolder)
                        stack.addArrangedSubview(address)
                        stack.addArrangedSubview(dateTime)

                        self.stackView.addArrangedSubview(stack)

运行时会产生这样的结果：

如果我从等式中删除 UIView，即：

                        let stack = UIStackView()
                        stack.axis = .Vertical
                        stack.alignment = .Leading
                        stack.distribution = .EqualCentering
                        stack.spacing = 0

                        let width = UIScreen.mainScreen().bounds.size.width

                        let frame = CGRect(x: 0, y: 0, width: width, height: 50)
                        let viewHolder = UIView(frame: frame)
                        viewHolder.backgroundColor = blueColor

                        //Needs a blue background
                        let name = UILabel()
                        name.text = nameText
                        name.textColor = yellowColor
                        name.backgroundColor = blueColor
                        name.font = UIFont.boldSystemFontOfSize(32.0)                        

                        let address = UILabel()
                        address.text = addressText

                        let dateTime = UILabel()
                        dateTime.text = calString

                        //viewHolder.addSubview(name)
                        stack.addArrangedSubview(name) //Add the label directly to the UIStackView
                        stack.addArrangedSubview(address)
                        stack.addArrangedSubview(dateTime)

                        self.stackView.addArrangedSubview(stack)

我得到：

我只需要蓝色部分在屏幕上伸展

Answer 1

所以，答案是，不要使用 UIStackView。使用内置的 UITableView 进行这种布局。