extension UILabel{
func requiredHeight() -> CGFloat {
let frame = CGRect(x: 0, y: 0, width: labelWidth, height: CGFloat.greatestFiniteMagnitude)
let label = UILabel(frame: frame)
label.numberOfLines = 0
label.lineBreakMode = NSLineBreakMode.byWordWrapping
label.font = self.font
label.text = self.text
label.sizeToFit()
return label.frame.height
}
}
说明: labelWidth是需要你定的label宽度
