iOS 16.0 Beta 3下UITextView固有尺寸异常问题咨询

在运行iOS 16.0 Beta 3（版本号20A5312j）的iPhone 12 Pro Max实体设备上，出现了UITextView固有尺寸异常的问题。该问题在运行正式版iOS 13及以上系统的其他实体设备和模拟器上均未出现。

• 左侧为预期效果，也是模拟器及非Beta版iOS设备上的实际显示效果；
• 右侧为Beta 3设备上的显示情况：顶部UITextView的固有宽度不足以容纳文本，底部UITextView的固有高度过短，无法完全显示文本。

已完成的排查步骤 #

• 调用setNeedsLayout等方法无法解决问题；
• 设置contentCompressionResistancePriority为.required无任何作用；
• 边框的有无不影响该问题，添加边框仅为便于观察；
• 调整textContainerInset可正常改变内边距，但问题依然存在；
• 不需要UILabel或其他替代方案（因需使用数据检测器）；
• 不需要非AutoLayout的临时解决方法（如手动计算尺寸）。

我的疑问 #

(a) 是否遗漏了某些可避免该问题的属性设置；
(b) 其他开发者能否在Beta 3实体设备上复现该问题。若能复现，我将提交Bug报告，只想确认是否有明显遗漏。

复现代码 #

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let shortTextView = addTextView()
        shortTextView.text = "foo bar baz"

        let longTextView = addTextView()
        longTextView.text = "This is a test. This is a test. This is a test. This is a test. This is a test. This is a test. This is a test. This is a test. This is a test."

        NSLayoutConstraint.activate([
            shortTextView.topAnchor.constraint(equalTo: view.topAnchor, constant: 100),
            longTextView.topAnchor.constraint(equalTo: shortTextView.bottomAnchor, constant: 40)
        ])
    }

    /// Add text view to main view
    ///
    /// This:
    ///    1. Creates text view (with border so we can see its `frame`);
    ///    2. Adds to the main view; and
    ///    3. Adds horizontal constraints (with `lessThanOrEqual` for width to take advantage of text view’s intrinsic size).
    ///
    /// Note, even if you turn off the border, I see the same problem on physical device running iOS 16.0 Beta 3 (20A5312j).
    /// But the border lets you see what's going on.

    func addTextView() -> UITextView {
        let textView = UITextView()
        textView.translatesAutoresizingMaskIntoConstraints = false
        textView.isScrollEnabled = false
        textView.isEditable = false
        textView.layer.borderWidth = 1
        textView.layer.borderColor = UIColor.gray.cgColor

        view.addSubview(textView)

        let widthConstraint = NSLayoutConstraint(
            item: textView,
            attribute: .width,
            relatedBy: .lessThanOrEqual,
            toItem: view,
            attribute: .width,
            multiplier: 0.8,
            constant: 0
        )

        NSLayoutConstraint.activate([
            textView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            widthConstraint
        ])

        // note, vertical constraint not yet set ... will be set by caller

        return textView
    }
}

内容的提问来源于stack exchange，提问作者Rob