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废话不说 直接上代码

func stringHeightWith(fontSize:CGFloat,width:CGFloat)->CGFloat    {        let font = UIFont.systemFontOfSize(fontSize)        let size = CGSizeMake(width,CGFloat.max)        let paragraphStyle = NSMutableParagraphStyle()        paragraphStyle.lineBreakMode = .ByWordWrapping;        let  attributes = [NSFontAttributeName:font,            NSParagraphStyleAttributeName:paragraphStyle.copy()]                let text = self as NSString        let rect = text.boundingRectWithSize(size, options:.UsesLineFragmentOrigin, attributes: attributes, context:nil)        return rect.size.height    }

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