如何强制放置远远超出UITextView垂直边界的字形布局？

class CustomTextView: UITextView {
    override func layoutSubviews() {
        super.layoutSubviews()
        
        // 获取文本内容的范围
        let textRange = self.layoutManager.characterRangeThatFits(self.textContainer)
        
        // 获取文本内容的矩形框
        let textRect = self.layoutManager.boundingRect(forGlyphRange: textRange, in: self.textContainer)
        
        // 计算文本内容超出垂直边界的高度差
        let overflowHeight = textRect.height - self.bounds.height
        
        // 如果超出高度大于0，则修改文本容器的高度
        if overflowHeight > 0 {
            var textContainerInset = self.textContainerInset
            textContainerInset.bottom += overflowHeight
            self.textContainerInset = textContainerInset
        }
    }
}

let customTextView = CustomTextView()
customTextView.frame = CGRect(x: 0, y: 0, width: 200, height: 100)
customTextView.text = "这是一段超出垂直边界的文本内容"
self.view.addSubview(customTextView)