Ios 如何使UIControl在XUITest中显示为按钮？

我已经创建了一个UIControl子类，其行为应该类似于UIButton

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当我使用XUITest运行UI测试时，按钮出现在

XUIApplication（）.StaticText

中，而不是预期的

XUIApplication（）.buttons

在四处搜索之后，我发现这是由于未设置可访问性特征。例如，如果我有以下课程

class ActivityButton: UIControl {

    private let activityIndicator: UIActivityIndicatorView = {
        let activityIndicator = UIActivityIndicatorView()
        activityIndicator.hidesWhenStopped = true
        activityIndicator.translatesAutoresizingMaskIntoConstraints = false
        return activityIndicator
    }()

    let titleLabel: UILabel = {
        let titleLabel = UILabel()
        titleLabel.translatesAutoresizingMaskIntoConstraints = false
        return titleLabel
    }()

    override public init(frame: CGRect) {
        super.init(frame: frame)
        // This is the required call to make the control appear 
        // as a button in ui tests
        accessibilityTraits = UIAccessibilityTraitButton
        addSubview(activityIndicator)
        addSubview(titleLabel)
        createConstraints()
    }    

}

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在四处搜寻之后，我发现这是由于没有设置可访问性特征。例如，如果我有以下课程

class ActivityButton: UIControl {

    private let activityIndicator: UIActivityIndicatorView = {
        let activityIndicator = UIActivityIndicatorView()
        activityIndicator.hidesWhenStopped = true
        activityIndicator.translatesAutoresizingMaskIntoConstraints = false
        return activityIndicator
    }()

    let titleLabel: UILabel = {
        let titleLabel = UILabel()
        titleLabel.translatesAutoresizingMaskIntoConstraints = false
        return titleLabel
    }()

    override public init(frame: CGRect) {
        super.init(frame: frame)
        // This is the required call to make the control appear 
        // as a button in ui tests
        accessibilityTraits = UIAccessibilityTraitButton
        addSubview(activityIndicator)
        addSubview(titleLabel)
        createConstraints()
    }    

}