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如何计算UITextView中文本的高度?

我怎么知道这个textView里面文字的高度?

lazy var textView: UITextView = {
    let tv = UITextView()
    tv.textColor = .white
    tv.translatesAutoresizingMaskIntoConstraints = false
    tv.isEditable = false
    tv.backgroundColor = .white
    tv.text = "Se non vuoi vedere di nuovo questa presentazione clicca sul bottone qui sotto..."
    tv.textAlignment = .center
    tv.font = UIFont(name: "Avenir-Light", size: 22)
    return tv
}()
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uitextview ios swift

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ios ×1

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uitextview ×1