Json 如何在swift中解析时向标签添加字典值的响应后字符串

json post响应如下：

     {
"response": {
    "responseReason": "Successful",
    "billDetails": "",
    "billerResponse":"{\"customerName\":\"RAM\",\"amount\":193,\"dueDate\":\"2019-11-30\",\"custConvFee\":\"\",\"custConvDesc\":\"\",\"billDate\":\"2019-11-16\",\"billNumber\":\"32224081911191623\",\"billPeriod\":\"NA\",\"billTags\":[],\"fieldName\":\"Service Number\",\"fieldValue\":\"116515M025007621\",\"billerName\":\"EPDCL-Eastern Power Distribution Ltd\"}",

为此，我编写了如下代码： 这里我得到了json响应，但我需要标签中的

customerName

amount

dueDate

值

func billerFetchService(){    

let parameters = ["billDetails": [
    "billerId" : "EPDCLOB00ANP01",
    "customerParams" : [["name":"Service Number","value":"116515M025007621"]]]]

let url = URL(string: "https://app.com/fetch_v1/fetch")
var req =  URLRequest(url: url!)
req.httpMethod = "POST"
req.addValue("application/json", forHTTPHeaderField: "Contet-Type")
req.addValue("application/json", forHTTPHeaderField: "Accept")

guard let httpBody = try? JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted) else {return}
req.httpBody = httpBody
let session = URLSession.shared
session.dataTask(with: req, completionHandler: {(data, response, error) in
    if response != nil {
        // print(response)
    }
    if let data = data {
        do{
            var json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as! [String: Any]
             print("fetching json \(json)")

            let billerDetails = json["billerResponse"] as! String
            print("fetch only billerdetails \(billerDetails)")

            let res = try JSONSerialization.jsonObject(with:Data(billerDetails.utf8)) as! [String: Any]
            let billerName = res["customerName"] as? String
            print("fetch only EPDCL biller name \(billerName)"

        }catch{
            print("error")
        }
    }
}).resume()
}

让billerDetails=json[“billerResponse”]as！字符串

我得到了

线程5:致命错误：在展开可选值时意外发现nil

你可以试试

let billerDetails = json["response"] as! [String:Any]
let value = billerDetails["billerResponse"] as! String
print(value)

你可以试试

let billerDetails = json["response"] as! [String:Any]
let value = billerDetails["billerResponse"] as! String
print(value)

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请帮帮我，我被困在这里很久了。。请帮帮我，我被困在这里很久了。。