ios - Scrollview 中的两个动态 Stackview

Question

这是我的视图的层次结构

ScrollView
 -> View
    -> Stackview1
       -> view1
       -> view2
       .
       .
       .
    -> Stackview1
       -> view1
       -> view2
       .
       .
       .

所以这里我的stackview的高度是根据.swift文件中添加的视图动态生成的

如果我给超级视图提供底部约束，它只适用于单个堆栈视图，但如果我同时使用两个堆栈视图，则不会考虑第二个堆栈视图。

标签： iosswiftautolayoutuistackview

Answer 1

很难说出问题所在，因为您尚未发布约束，但解决方案非常简单：

您需要以下约束：

滚动视图：

• topAnchor至view.topAnchor
• leadingAnchor至view.leadingAnchor
• trailingAnchor至view.trailingAnchor
• bottomAnchor至view.bottomAnchor

包装 2 个 UIStackViews 的 UIView：

• topAnchor至scrollView.topAnchor
• leadingAnchor至scrollView.leadingAnchor
• trailingAnchor至scrollView.trailingAnchor
• bottomAnchor至scrollView.bottomAnchor

上层堆栈视图：

• topAnchor至wrapperView.topAnchor
• leadingAnchor至wrapperView.leadingAnchor
• trailingAnchor至wrapperView.trailingAnchor
• widthAnchorto scrollView.widthAnchor（定义 ScrollView 的宽度contentSize）

较低的 StackView：

• topAnchor至upperStackView.bottomAnchor
• leadingAnchor至wrapperView.leadingAnchor
• trailingAnchor至wrapperView.trailingAnchor
• bottomAnchor至wrapperView.bottomAnchor

现在，当您UIView向其中一个中添加一个时UIStackViews，UIScrollView 会自动更新。

这是一个工作示例：（我添加了两个以向两者UIButtons添加更多）UIViewsUIStackViews

class ViewController: UIViewController {

    let upperStackView = UIStackView()
    let lowerStackView = UIStackView()

    override func viewDidLoad() {
        super.viewDidLoad()

        let scrollView = UIScrollView()
        view.addSubview(scrollView)
        scrollView.backgroundColor = .white
        scrollView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            scrollView.topAnchor.constraint(equalTo: view.topAnchor),
            scrollView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            scrollView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
        ])

        let wrapperView = UIView()
        scrollView.addSubview(wrapperView)
        wrapperView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            wrapperView.topAnchor.constraint(equalTo: scrollView.topAnchor),
            wrapperView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor),
            wrapperView.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor),
            wrapperView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor),
        ])

        upperStackView.axis = .vertical
        upperStackView.distribution = .equalSpacing
        upperStackView.alignment = .fill
        wrapperView.addSubview(upperStackView)
        upperStackView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            upperStackView.topAnchor.constraint(equalTo: wrapperView.topAnchor),
            upperStackView.leadingAnchor.constraint(equalTo: wrapperView.leadingAnchor),
            upperStackView.trailingAnchor.constraint(equalTo: wrapperView.trailingAnchor),
            upperStackView.widthAnchor.constraint(equalTo: scrollView.widthAnchor)
            ])

        lowerStackView.axis = .vertical
        lowerStackView.distribution = .equalSpacing
        lowerStackView.alignment = .fill
        wrapperView.addSubview(lowerStackView)
        lowerStackView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            lowerStackView.topAnchor.constraint(equalTo: upperStackView.bottomAnchor),
            lowerStackView.leadingAnchor.constraint(equalTo: wrapperView.leadingAnchor),
            lowerStackView.trailingAnchor.constraint(equalTo: wrapperView.trailingAnchor),
            lowerStackView.bottomAnchor.constraint(equalTo: wrapperView.bottomAnchor)
            ])

        for _ in 0...3 {
            addView(to: upperStackView)
            addView(to: lowerStackView)
        }

        let lowerButton = UIButton(type: .system)
        lowerButton.setTitle("Add to lower StackView", for: .normal)
        lowerButton.backgroundColor = .white
        lowerButton.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(lowerButton)
        NSLayoutConstraint.activate([
            lowerButton.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -60),
            lowerButton.widthAnchor.constraint(equalToConstant: 240),
            lowerButton.heightAnchor.constraint(equalToConstant: 44),
            lowerButton.centerXAnchor.constraint(equalTo: view.centerXAnchor)
        ])
        lowerButton.addTarget(self, action: #selector(addViewToLowerStackView), for: .touchUpInside)

        let upperButton = UIButton(type: .system)
        upperButton.setTitle("Add to upper StackView", for: .normal)
        upperButton.backgroundColor = .white
        upperButton.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(upperButton)
        NSLayoutConstraint.activate([
            upperButton.bottomAnchor.constraint(equalTo: lowerButton.topAnchor, constant: -20),
            upperButton.widthAnchor.constraint(equalToConstant: 240),
            upperButton.heightAnchor.constraint(equalToConstant: 44),
            upperButton.centerXAnchor.constraint(equalTo: view.centerXAnchor)
            ])
        upperButton.addTarget(self, action: #selector(addViewToUpperStackView), for: .touchUpInside)
    }

    func addView(to stackView: UIStackView) {
        let view = UIView()
        view.backgroundColor = stackView == upperStackView ? .blue : .green
        view.alpha = CGFloat(stackView.arrangedSubviews.count + 1) * 0.1
        view.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([view.heightAnchor.constraint(equalToConstant: 120)])
        stackView.addArrangedSubview(view)
    }

    @objc func addViewToUpperStackView() {
        addView(to: upperStackView)
    }

    @objc func addViewToLowerStackView() {
        addView(to: lowerStackView)
    }
}

更新：

您也可以仅使用 Storyboard 来完成这项工作：