为什么 UITextView 滚动在 tvOS 上不起作用？

Question

我有UITextView ：

    private let descriptionView: UITextView = {
       let view = UITextView()
       view.translatesAutoresizingMaskIntoConstraints = false
       view.bounces = true
       view.textColor = UIColor.white
       view.font = UIFont(name: Fonts.regular, size: 28)

       view.isSelectable = true
       view.isUserInteractionEnabled = true
       view.panGestureRecognizer.allowedPressTypes = [NSNumber(value: UITouch.TouchType.indirect.rawValue)]
       view.showsVerticalScrollIndicator = true
       return view
    }()

在另一个视图中添加

    addSubview(descriptionView)
    addConstraints([
        descriptionView.leadingAnchor.constraint(equalTo: title.leadingAnchor),
        descriptionView.topAnchor.constraint(equalTo: ratings.bottomAnchor, constant: 60),
        descriptionView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -80),
        descriptionView.bottomAnchor.constraint(equalTo: bottomAnchor)
    ])

isSelectable = true ,

view.isUserInteractionEnabled = true 。

视图聚焦很好，但不是滚动。

内容高度 > textview 高度

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