TextHeight.swift

extension String {
    func height(_ width: CGFloat, font: UIFont, lineBreakMode: NSLineBreakMode?) -> CGFloat {
        var attrib: [String: AnyObject] = [NSFontAttributeName: font]
        if lineBreakMode != nil {
            let paragraphStyle = NSMutableParagraphStyle();
            paragraphStyle.lineBreakMode = lineBreakMode!;
            attrib.updateValue(paragraphStyle, forKey: NSParagraphStyleAttributeName);
        }
        let size = CGSize(width: width, height: CGFloat(DBL_MAX));
        return ceil((self as NSString).boundingRect(with: size, options: NSStringDrawingOptions.usesLineFragmentOrigin, attributes:attrib, context: nil).height)
    }
}