swift json转字典 - 字典转json

//   json 转字典
func getDictionaryFromJSONString(jsonString:String) ->NSDictionary{
    
    let jsonData:Data = jsonString.data(using: .utf8)!
    
    let dict = try? JSONSerialization.jsonObject(with: jsonData, options: .mutableContainers)
    if dict != nil {
        return dict as! NSDictionary
    }
    return NSDictionary()
}



// 字典 转 json
func getJSONStringFromDictionary(dictionary:NSDictionary) -> String {
    if (!JSONSerialization.isValidJSONObject(dictionary)) {
        print("没法解析出JSONString")
        return ""
    }
    let data : NSData! = try? JSONSerialization.data(withJSONObject: dictionary, options: []) as NSData!
    let JSONString = NSString(data:data as Data,encoding: String.Encoding.utf8.rawValue)
    return JSONString! as String
    
}