UIStackView 我可以用自动调整大小而不是自动布局来添加它吗

Question

我尝试将 UIStackView 放置在 UIScrollView 中，并使用自动调整掩码 .flexibleWidth、.flexibleHeight -> 即水平/垂直拉伸以填充滚动视图，但如果我将其更改为带有前导/尾随/底部的自动布局代码，则堆栈视图不会出现/top 约束然后视图正确显示

toolbar.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        toolbar.backgroundColor = .clear
        toolbar.axis = .horizontal
        toolbar.distribution = .fill
        toolbar.alignment = .fill
        toolbar.spacing = 8


        toolbarScroll.frame = bounds
        toolbarScroll.autoresizingMask = [.flexibleHeight, .flexibleWidth]
        toolbarScroll.showsHorizontalScrollIndicator = false
        toolbarScroll.showsVerticalScrollIndicator = false
        toolbarScroll.backgroundColor = UIColor.green

        toolbarScroll.addSubview(toolbar)

这里的代码如果在 addSubview 之后添加，那么工具栏会显示在 toolbarScroll 中

toolbar.translatesAutoresizingMaskIntoConstraints = false

toolbar.leadingAnchor.constraint(equalTo: toolbarScroll.leadingAnchor).isActive = true
toolbar.trailingAnchor.constraint(equalTo: toolbarScroll.trailingAnchor).isActive = true
 toolbar.bottomAnchor.constraint(equalTo: toolbarScroll.bottomAnchor).isActive = true
 toolbar.topAnchor.constraint(equalTo: toolbarScroll.topAnchor).isActive = true

Answer 1

你将toolbar添加到toolbarScroll，但你没有给它一个框架。

toolbarScroll.addSubview(toolbar)

// just to make sure...
toolbar.translatesAutoresizingMaskIntoConstraints = true

// give the toolbar stackView a frame
toolbar.frame = toolbarScroll.bounds