Xcode 11+， Swift 5

如果你想知道为什么所有的答案都不再工作了，请确保你已经固定了内容视图(你已经放在滚动视图内的那个)到滚动视图的内容布局指南，而不是框架布局指南。

内容视图边缘(前导，后拉，顶部，底部)不应该像图像-框架布局指南上的前导那样被固定

但像这样-内容布局指南。

然后大部分答案都会适用于你。

现在最简单的方法是这样的:

把滚动视图放到根视图中 将滚动视图的所有边固定在父视图上 取另一个UIView(我们称之为content view)把它放到滚动视图中 将内容视图的所有边固定在滚动视图的内容布局指南上 固定内容视图的宽度等于滚动视图的框架布局指南 以任何你想要的方式固定内容视图的高度(我在下面的例子中使用了常量高度约束)

总的来说，在最简单的实现中，你的结构是这样的

import UIKit

class ViewController: UIViewController {

    //
    let scrollView: UIScrollView = {
        
        let sv = UIScrollView()
        sv.translatesAutoresizingMaskIntoConstraints = false
        return sv
    }()
    
    let lipsumLbl: UILabel = { // you can use here any of your subview
        
        let lbl = UILabel()
        lbl.translatesAutoresizingMaskIntoConstraints = false
        lbl.text = """
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce eleifend nisi sit amet mi aliquet, ut efficitur risus pellentesque. Phasellus nulla justo, scelerisque ut libero id, aliquet ullamcorper lectus. Integer id iaculis nibh. Duis feugiat mi vitae magna tincidunt, vitae consequat dui tempor. Donec blandit urna nec urna volutpat, sit amet sagittis massa fringilla. Pellentesque luctus erat nec dui luctus, sed maximus urna fermentum. Nullam purus nibh, cursus vel ex nec, pulvinar lobortis leo. Proin ac libero rhoncus, bibendum lorem sed, congue sapien. Donec commodo, est non mollis malesuada, nisi massa tempus ipsum, a varius quam lorem vitae nunc.
        
        Cras scelerisque nisi dolor, in gravida ex ornare a. Interdum et malesuada fames ac ante ipsum primis in faucibus. Maecenas vitae nisl id erat sollicitudin accumsan sit amet viverra sapien. Etiam scelerisque vulputate ante. Donec magna nibh, pharetra sed pretium ac, feugiat sit amet mi. Vestibulum in ipsum vitae dui vehicula pulvinar eget ut lectus. Fusce sagittis a elit ac elementum. Fusce iaculis nunc odio, at fermentum dolor varius et. Suspendisse consectetur congue massa non gravida. Sed id elit vitae nulla aliquam euismod. Pellentesque accumsan risus dolor, eu cursus nibh semper id.
        
        Vestibulum vel tortor tellus. Suspendisse potenti. Pellentesque id sapien eu augue placerat dictum. Fusce tempus ligula at diam lacinia congue in ut metus. Maecenas volutpat tellus in tellus maximus imperdiet. Integer dignissim condimentum lorem, id luctus nisi maximus at. Nulla pretium, est sit amet mollis eleifend, tellus nulla viverra dolor, ac feugiat massa risus a lectus. Pellentesque ut pulvinar urna, blandit gravida ipsum. Nullam volutpat arcu nec fringilla auctor. Integer egestas enim commodo, faucibus neque ac, rutrum magna. Vivamus tincidunt rutrum auctor. Cras at rutrum felis. Fusce elementum lorem ut pharetra venenatis.
        """
        lbl.textColor = .darkGray
        lbl.font = UIFont.systemFont(ofSize: 16)
        lbl.numberOfLines = 0
        return lbl
    }()
    
    //======================================================================//
    //
    // MARK:- viewDidLoad
    //
    override func viewDidLoad() {
        super.viewDidLoad()
        
        setupViews()
        setupAutoLayout()
    }
    
    func setupViews() {
        
        title = "ScrollView Demo"
        view.backgroundColor = .white
        view.addSubview(scrollView)
        scrollView.addSubview(lipsumLbl)
    }
    
    func setupAutoLayout() {
        
        scrollView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
        scrollView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
        scrollView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
        
        lipsumLbl.topAnchor.constraint(equalTo: scrollView.topAnchor).isActive = true
        lipsumLbl.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
        lipsumLbl.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
        lipsumLbl.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor).isActive = true
    }
}

输出:

你只需要确保有办法使它连续 从滚动视图的顶部到底部的约束行。 (-X-X-X)

在我的例子中——一个水平滚动的滚动视图——我还需要为滚动视图的每个子视图添加宽度和高度限制，尽管苹果的技术说明没有告诉你这一点。

见下图:内容视图以滚动视图垂直和水平集中。 你有歧义错误，总是确保从你的内容视图添加到scrollview的两个是1).按钮空间到容器。2)尾随空间到屏幕截图中突出显示的约束，

这些约束的意思是在滚动中，你可以在你的内容视图高度或宽度后滚动多少。

它可能对你有帮助。

我通过使用“解决自动布局问题”>“为所选视图添加缺失约束”来解决我的视图的这种问题

以下两个约束条件可以解决我的问题:

trailing = Stack View.trailing - 10
bottom = Stack View.bottom + 76

中: 尾随，bottom是UIScrollView的尾随，底部

Xcode 11 +。

使用自动布局的最简单方法:

Add UIScrollView and pin it 0,0,0,0 to superview (or your desired size) Add container of UIView type inside ScrollView, pin it 0,0,0,0 to all 4 sides and center it horizontally and vertically. In size inspector of container, change bottom and align center Y priority to 250. (for horizontal scroll change trailing and align center X) Add all views that you need into said container (UIView). Don't forget to set the bottom constraint on the lowest view. Select the UIScrollView, select the size inspector and deselect Content Layout Guides.