ios - UIScrollView 不滚动 - 内容大小不明确

Question

I am trying to create a Scroll View. The view itself is correctly displayed but it does not scroll, even though I added a view to it and set the content size.

注意:我没有使用 Storyboard ，而是仅使用约束 (AutoLayout)。

代码:

let scrollView: UIScrollView = {
        let sv = UIScrollView()
        sv.isScrollEnabled = true
        sv.backgroundColor = .brown
        return sv
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        setupViews()
    }

    func setupViews() {
        self.view.addSubview(scrollView)
        scrollView.anchor(top: self.view.topAnchor, left: self.view.leftAnchor, bottom: self.view.bottomAnchor, right: self.view.rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)
        scrollView.contentSize = CGSize(width: self.view.frame.width, height: 2000)

        print(scrollView.contentSize)

        let view = UIView()
        view.backgroundColor = .blue


        scrollView.addSubview(view)

        view.anchor(top: scrollView.topAnchor, left: scrollView.leftAnchor, bottom: scrollView.bottomAnchor, right: scrollView.rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)
    }

.anchor() 是我制作的自定义扩展，目的是使约束 View 更容易。

如有任何帮助，我们将不胜感激。

Answer 1

最好不要将自动布局与框架布局混合使用

1- 评论

scrollView.contentSize = CGSize(width: self.view.frame.width, height: 2000)

2- 在 scrollview 内的 View 与 vc 的 View 之间设置等宽约束，高度约束为 2000

为了不和vc的view change混淆

let view = UIView()

到

let contentView = UIView()

然后添加这两个约束

contentView.widthAnchor.constraint(equalTo:self.view.widthAnchor).isActive = true
contentView.heightAnchor.constraint(equalToConstant:2000).isActive = true