ios - 如何在 ScrollView 中添加所有(标签，按钮， subview )？

Question

我在主视图上设计了自动布局，但我忘记添加scrollView。

我需要以编程方式添加 ScrollView 或重新设计我的 View 吗？

这是我的代码

var scrollView: UIScrollView!

//viewDid load        
    let screensize: CGRect = UIScreen.main.bounds
    let screenWidth = screensize.width
    let screenHeight = screensize.height
    scrollView = UIScrollView(frame: CGRect(x: 0, y: 0, width: screenWidth, height: screenHeight))

    for view in view.subviews{

        let constraint = 

        scrollView.addSubview(view)
    }
    scrollView.contentSize = CGSize(width: screenWidth, height: screenHeight)

Answer 1

很难说你的 View Controller 中有什么样的 View 层次结构以及它们之间有什么样的关系，但这可能会以某种形式或形式对你有所帮助。

class ViewController: UIViewController {
    lazy var scrollView: UIScrollView = {
        let s = UIScrollView()
        s.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(s)
        s.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        s.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
        s.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        s.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
        return s
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        let subviews = view.subviews

        // remove all subviews from main view
        view.subviews.forEach {
            $0.removeFromSuperview()
        }

        // create vertical stackview, this will help to write less constraints on each subview
        let stackView = UIStackView()
        stackView.translatesAutoresizingMaskIntoConstraints = false
        stackView.alignment = .fill
        stackView.axis = .vertical
        stackView.distribution = .fill

        // all all subviews in stackview
        subviews.forEach {
            stackView.addArrangedSubview($0)
        }

        // add stackview in main view
        scrollView.addSubview(stackView)
        stackView.topAnchor.constraint(equalTo: scrollView.topAnchor).isActive = true
        stackView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor).isActive = true
        stackView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor).isActive = true
        stackView.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor).isActive = true
        stackView.centerXAnchor.constraint(equalTo: scrollView.centerXAnchor).isActive = true
    }
}

这是我在 Storyboard上的 View Controller 。 View Controller 出现在屏幕上后，这两个 View 将被包装在 ScrollView 中。