UIStackview 子视图的固定高度约束

Question

我有一个UIScrollView，它有一个UIStackView 子视图，称之为stack。我想在stack 中有一个动态数量的子视图，但是这些子视图会有不同的高度。我怎样才能做到这一点？请注意，我试图回避 Storyboard..

let scrollView = UIScrollView(frame: CGRect(x: 20, y: 20, width: view.frame.width - 20, height: view.frame.height - 20))
scrollView.center = view.center
self.view.addSubview(scrollView)


let stack = UIStackView(frame: CGRect(x: 20, y: 20, width: scrollView.frame.width - 40, height: scrollView.frame.height - 40))
stack.axis = .vertical
stack.alignment = .fill
stack.distribution = .fillProportionally
stack.spacing = 20
scrollView.addSubview(stack)

let label1 = UILabel()
label1.text = "This is going to be very, very long. I don't know how to make this guy longer. Words and words and more words. // Do any additional setup after loading the view, typically from a nib."
label1.numberOfLines = 0
label1.sizeToFit()

// Add more labels similar to label1

我尝试为我的每个UILabel 子视图添加一个约束，但它并没有真正起作用..

let x = NSLayoutConstraint(item: label1, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: label1.frame.size.height)
label1.addConstraint(x)

请帮忙！谢谢。

Answer 1

尝试改变堆栈视图的分布模式：

stack.distribution = .fillProportionally

（我不确定这是否正确，如果不是尝试所有不同的分发模式:)）