swift计算文本高度
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let sizing = UILabel()
sizing.numberOfLines = 3
sizing.font = messageLabel.font
sizing.text = fullText
sizing.attributedText = NSAttributedString(string: fullText)
sizing.lineBreakMode = .byTruncatingTail
let size = sizing.sizeThatFits(CGSize(width: 236, height: Double.greatestFiniteMagnitude))
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