How Can I Get the height of the UITextView about swiftrichstring HOT 6 OPEN

var textView = UITextView()

override func viewDidLoad() {
    super.viewDidLoad()
    
    self.view.backgroundColor = UIColor.white
    self.view.addSubview(textView)
    textView.backgroundColor = .black
    textView.snp.makeConstraints { (maker) in
        maker.top.equalTo(self.view.safeAreaLayoutGuide).offset(20)
        maker.width.left.equalTo(self.view)
        maker.height.equalTo(800)
    }
    
    let taggedText = """
    This other is loaded from remote URL This other is loaded from remote URL This other is loaded from remote URL This other is loaded from remote URL This other is loaded from remote URL:
    <img url="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1601572902181&di=7b0ddfd1460945c25e811691fcd5a710&imgtype=0&src=http%3A%2F%2Fimg1.imgtn.bdimg.com%2Fit%2Fu%3D2584119826%2C556593725%26fm%3D214%26gp%3D0.jpg"/>
    """
    let styleBase = Style({
        $0.font = UIFont.boldSystemFont(ofSize: 15)
    })
    let styleBold = Style({
        $0.font = UIFont.boldSystemFont(ofSize: 20)
        $0.color = UIColor.blue
    })
    let groupStyle = StyleXML.init(base: styleBase, ["b" : styleBold])
    textView.attributedText = taggedText.set(style: groupStyle)
    
    textView.textContainerInset = .zero
    textView.textContainer.lineFragmentPadding = 0
    textView.isScrollEnabled = false
    
    let newheight = textView.sizeThatFits(.init(width: self.view.frame.width, height: .greatestFiniteMagnitude)).width

    textView.snp.updateConstraints { (maker) in
        maker.height.equalTo(newheight)
    }

    print(newheight)
    // Do any additional setup after loading the view.
}