swift：字符串转字典

// MARK:字符串转字典

 func stringValueDic(_ str: String) -> [String : Any]?{        

    let data = str.data(using: String.Encoding.utf8)        

    if let dict = try? JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as? [String : Any] {            

        return dict        

        }        

    return nil    

}