Json parse array in dictionary - json

Question

I use json api in my application. It can check a company does use electronic Invoice. I have a json data like that:
{
"ErrorStatus": null,
"Result": {
"CustomerList": [
{
"RegisterNumber": "6320036072",
"Title": "VATAN BİLGİSAYAR SANAYİ VE TİCARET ANONİM ŞİRKETİ",
"Alias": "urn:mail:defaultpk#vatanbilgisayar.com",
"Type": "Özel",
"FirstCreationTime": "2014-01-01T05:35:20",
"AliasCreationTime": "2014-01-01T05:35:20"
}
],
"ISEInvoiceCustomer": true
} }
and i use that fucntion for get json data:
func getClientQuery(authorization:String) {
let url = NSURL(string: URLCustomerCheck+strRegisterNumber)
let request = NSMutableURLRequest(url: url! as URL)
request.httpMethod = "GET"
request.addValue(authorization, forHTTPHeaderField: "Authorization")
let task = URLSession.shared.dataTask(with: request as URLRequest) { data,response,error in
if error != nil {
let alert = UIAlertController(title: "Error", message: error?.localizedDescription, preferredStyle: UIAlertControllerStyle.alert)
let okButton = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
alert.addAction(okButton)
self.present(alert, animated: true, completion: nil)
} else {
if data != nil {
do {
let jSONResult = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as! Dictionary<String,AnyObject>
DispatchQueue.main.async {
print(jSONResult)
let result = jSONResult["Result"] as! [String:AnyObject]
//let customerList = result["CustomerList"] as! [[String:AnyObject]]
let ISEInvoiceCustomer = String(describing: result["ISEInvoiceCustomer"])
self._lblISEinvoiceCustomer.text = " \(ISEInvoiceCustomer) "
}
} catch {
}
}
}
}
task.resume()
}
My question is how can i parse "RegisterNumber", "Title".. in "CustomerList"? It's a array that have a member. However i can not parse it in my function.

Answer 1

The customerList line you commented out is needed. Then iterate that array and pull out whatever values you want from each dictionary.
And you really should avoid us as! or any other forced unwrapping when working with JSON. You don't want your app to crash when you obtain unexpected data.
And never use String(describing:) to create a value you will display to a user. The result is inappropriate for display. It's only to be used for debugging purposes.
if let jSONResult = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as? [String:Any]
DispatchQueue.main.async {
print(jSONResult)
if let result = jSONResult["Result"] as? [String:AnyObject],
let customerList = result["CustomerList"] as? [[String:Any]] {
for customer in customList {
let registrationNumber = customer["RegisterNumber"]
// and any others you need
}
let ISEInvoiceCustomer = result["ISEInvoiceCustomer"] as? Bool ?? false
self._lblISEinvoiceCustomer.text = ISEInvoiceCustomer) ? "Yes" : "No"
}
}
}

Answer 2

Better to Map json to Model , this become easy using Codable
import Foundation
struct Client: Codable {
let errorStatus: ErrorStatus?
let result: Result
enum CodingKeys: String, CodingKey {
case errorStatus = "ErrorStatus"
case result = "Result"
}
}
struct ErrorStatus: Codable {
}
struct Result: Codable {
let customerList: [CustomerList]
let iseInvoiceCustomer: Bool
enum CodingKeys: String, CodingKey {
case customerList = "CustomerList"
case iseInvoiceCustomer = "ISEInvoiceCustomer"
}
}
struct CustomerList: Codable {
let registerNumber, title, alias, type: String
let firstCreationTime, aliasCreationTime: String
enum CodingKeys: String, CodingKey {
case registerNumber = "RegisterNumber"
case title = "Title"
case alias = "Alias"
case type = "Type"
case firstCreationTime = "FirstCreationTime"
case aliasCreationTime = "AliasCreationTime"
}
}
// MARK: Convenience initializers
extension Client {
init(data: Data) throws {
self = try JSONDecoder().decode(Client.self, from: data)
}
init(_ json: String, using encoding: String.Encoding = .utf8) throws {
guard let data = json.data(using: encoding) else {
throw NSError(domain: "JSONDecoding", code: 0, userInfo: nil)
}
try self.init(data: data)
}
}
Get customerList :
func getClientQuery(authorization:String) {
let url = NSURL(string: URLCustomerCheck+strRegisterNumber)
let request = NSMutableURLRequest(url: url! as URL)
request.httpMethod = "GET"
request.addValue(authorization, forHTTPHeaderField: "Authorization")
let task = URLSession.shared.dataTask(with: request as URLRequest) { data,response,error in
if error != nil {
let alert = UIAlertController(title: "Error", message: error?.localizedDescription, preferredStyle: UIAlertControllerStyle.alert)
let okButton = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
alert.addAction(okButton)
self.present(alert, animated: true, completion: nil)
} else {
if data != nil {
if let client = try? Client.init(data: data){
client.result.customerList.forEach { (customer) in
print(customer.registerNumber)
}
}
}
}
}
task.resume()
}

Answer 3

let data = resultData
do {
guard let JSONResult = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers) as? [String : AnyObject],
let resultObject = JSONResult["Result"] as? [String : AnyObject],
let customerList = resultObject["CustomerList"] as? [Anyobject]
else { return }
// Loop the array of objects
for object in customerList {
let registerNumber = object["RegisterNumber"] as? String
let title = object["Title"] as? String
let alias = object["Alias"] as? String
let type = object["Type"] as? String
let firstCreationTime = object["FirstCreationTime"] as? String // Or as a DateObject
let aliasCreationTime = object["AliasCreationTime"] as? String // Or as a DateObject
}
let isEInvoiceCustomer = resultObject["ISEInvoiceCustomer"] as? Bool
} catch {
print(error)
}