腾讯平台分享链接中包含汉字 小数点  # % !*'();:@&=+$,/?%#[] 等等 可能会分享失败或者分享后打开失败  以下方法可以解决

//        let toSearchword = searchword.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLQueryAllowedCharacterSet())!

        /// 方法二

//        let toSearchword = CFURLCreateStringByAddingPercentEscapes(nil, searchword, "!*'();:@&=+$,/?%#[]", nil, CFStringBuiltInEncodings.UTF8.rawValue)

        /// encodeURI编码,不会对特殊符号编码

        let toSearchword = CFURLCreateStringByAddingPercentEscapes(nil, searchword, nil, "!*'();:@&=+$,/?%#[]", CFStringBuiltInEncodings.UTF8.rawValue)