强制标签显示它的文本

Question

我想包含一个类似于 reddit 应用程序的投票功能。我认为UIStackView 非常适合这个。现在我正在努力使投票和投票按钮之间的标签显示它的文本。

我尝试将 contentCompression 更改为 .fittingSizeLevel 和 .defaultHigh 但这似乎没有任何改变。在您可以看到的图像上，将有足够的空间来容纳整个文本，但事实并非如此。我缺少什么方面？

class VotingStackView: UIStackView {

    let arrowUpButton: UIButton = {
        let button = UIButton()
        button.backgroundColor = .clear
        button.tintColor = GSSettings.UI.Colors.tintColor
        button.imageView?.contentMode = .scaleAspectFit
        button.contentEdgeInsets = UIEdgeInsets(top: 16, left: 0, bottom: 16, right: 0)
        button.clipsToBounds = true
        return button
    }()

    let arrowDownButton: UIButton = {
        let button = UIButton()
        button.backgroundColor = .clear
        button.tintColor = GSSettings.UI.Colors.tintColor
        button.imageView?.contentMode = .scaleAspectFit
        button.contentEdgeInsets = UIEdgeInsets(top: 16, left: 0, bottom: 16, right: 0)
        button.clipsToBounds = true
        return button
    }()

    let percentageLabel: UILabel = {
        let label = UILabel()
        label.text = "100%"
        label.textColor = GSSettings.UI.Colors.regularTextColor
        label.font = GSSettings.UI.Fonts.helveticaLight?.withSize(20)
        label.clipsToBounds = false
        label.setContentCompressionResistancePriority(UILayoutPriority.fittingSizeLevel, for: .horizontal)
        return label
    }()

    var views: [UIView] = [UIView]()

    //MARK: - Init & View Loading
    override init(frame: CGRect) {
        super.init(frame: frame)
        views = [arrowUpButton, percentageLabel ,arrowDownButton]
        setupStackView()
        setupImages()
        setupSubviews()
    }

    //MARK: - Setup
    func setupStackView() {
        self.axis           = .horizontal
        self.spacing        = 0
        self.alignment      = .center
        self.distribution   = .fillEqually
    }

    func setupImages() {
        let upImage = UIImage(named: "arrow_up")
        let downImage = UIImage(named: "arrow_down")

        arrowUpButton.setImage(upImage, for: .normal)
        arrowDownButton.setImage(downImage, for: .normal)
    }

    func setupSubviews() {
        for view in views {
            addArrangedSubview(view)
        }
        layoutIfNeeded()
    }

    required init(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

votingStackView 是另一个 StackView 的一部分：

class BottomStackView: UIStackView {

    let votingStackView: VotingStackView = {
        let stackview = VotingStackView()
        return stackview
    }()

    let addFriendButton: UIButton = {
        let button = UIButton()
        button.backgroundColor = .clear
        button.tintColor = GSSettings.UI.Colors.tintColor
        button.setImage(UIImage(named: "plus")?.withRenderingMode(.alwaysTemplate), for: .normal)
        return button
    }()

    let redView: UIView = {
        let view = UIView()
        view.backgroundColor = .red
        return view
    }()

    var views: [UIView] = [UIView]()

    //MARK: - Init & View Loading
    override init(frame: CGRect) {
        super.init(frame: frame)
        views = [votingStackView, addFriendButton, redView]
        setupStackView()
        setupSubviews()
    }

    //MARK: - Setup
    func setupStackView() {
        self.axis           = .horizontal
        self.spacing        = 0
        self.alignment      = .leading
        self.distribution   = .fillEqually
    }

    func setupSubviews() {
        for view in views {
            addArrangedSubview(view)
        }
        layoutIfNeeded()
    }

    required init(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

Answer 1

改变

label.setContentCompressionResistancePriority(UILayoutPriority.fittingSizeLevel, for: .horizontal)

到

label.setContentCompressionResistancePriority(UILayoutPriority.defaultHigh, for: .horizontal)

从docs 看来fittingSizeLevel 似乎没有考虑到父约束，因此使用defaultHigh 似乎是更安全的选择。