iOS UILable 计算文字高度

iOS

uilable 一定要是 .byWordWrapping 计算才正确

public static func stringSize(calculateString: String, fontSize:CGFloat,width:CGFloat,lineSpacing:CGFloat=0)->CGSize {
        let font = FontUtils.getThinFont(fontSize)
        let size = CGSize(width: width,height: CGFloat.greatestFiniteMagnitude)
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.lineSpacing = lineSpacing
        paragraphStyle.lineBreakMode = .byWordWrapping;
        let  attributes = [NSFontAttributeName:font,
                           NSParagraphStyleAttributeName:paragraphStyle.copy()]
        let text = calculateString as NSString
        let rect = text.boundingRect(with: size, options:.usesLineFragmentOrigin, attributes: attributes, context:nil)
        return rect.size
    }