how yo access item key in swift 4 - ios

Question

if let url = URL(string: "https://mysit.com") {
URLSession.shared.dataTask(with: url) {
data, response, error in
guard
let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200,
let data = data, error == nil,
let valueEncoding = response?.textEncodingName,
let getContent = String(data: data, encoding: valueEncoding.textEncodingToStringEncoding)
else { return }
print(getContent)
}.resume()
}
my Data
{"Regions":null,"Cities":[{"Id":"9605","Name":"YANBAA AS SENAYAH"},{"Id":"15","Name":"ABHA"},{"Id":"13","Name":"AD DAMMAM"},{"Id":"1542","Name":"AL BAHA"},{"Id":"14","Name":"AL MADINAH AL MUNAWWARAH"},{"Id":"2213","Name":"AR'AR"},{"Id":"11","Name":"BURAYDAH"},{"Id":"10","Name":"HAIL"},{"Id":"17","Name":"JAZAN"},{"Id":"6","Name":"MAKKAH AL MUKARRAMAH"},{"Id":"3417","Name":"NAJRAN"},{"Id":"3","Name":"RIYADH"},{"Id":"2237","Name":"SAKAKA"},{"Id":"1","Name":"TABUK"},
how to get an array list of values "Name" ,can you help me?

Answer 1

You can try
struct Root :Decodable{
let Cities:[InnerItem]
}
struct InnerItem :Decodable{
let Id:String
let Name:String
}
do {
let arr = try JSONDecoder().decode(Root.self, from: data)
print(arr.Cities)
}
catch {
print(error)
}
//
Note : This is the correct json structure
{"Regions":null,"Cities":[{"Id":"9605","Name":"YANBAA AS SENAYAH"},{"Id":"15","Name":"ABHA"},{"Id":"13","Name":"AD DAMMAM"},{"Id":"1542","Name":"AL BAHA"},{"Id":"14","Name":"AL MADINAH AL MUNAWWARAH"},{"Id":"2213","Name":"AR'AR"},{"Id":"11","Name":"BURAYDAH"},{"Id":"10","Name":"HAIL"},{"Id":"17","Name":"JAZAN"},{"Id":"6","Name":"MAKKAH AL MUKARRAMAH"},{"Id":"3417","Name":"NAJRAN"},{"Id":"3","Name":"RIYADH"},{"Id":"2237","Name":"SAKAKA"},{"Id":"1","Name":"TABUK"}]}

Answer 2

let responseData = try JSONSerialization.jsonObject(with: (response["Cities"] as! String).data(using: String.Encoding.utf8)!, options: []) as! [[String: Any]]
for item in responseData{
let name = item["Name"] as! String
}

Answer 3

Together with the decoding step. I added several guards to print an error if one comes up. It is generally good practice to throw the error and handle it on the appropriate level.
func work() {
guard let url = URL(string: "https://mysit.com") else {
fatalError("url is nil.")
}
URLSession.shared.dataTask(with: url) {
data, response, error in
guard error == nil else {
fatalError("\(error!)")
}
guard let response = response as? HTTPURLResponse,
response.statusCode == 200 else {
fatalError("Response is nil.")
}
guard let data = data else {
fatalError("data is nil.")
}
decode(data: data)
}.resume()
}
func decode(data: Data) {
let decoder = JSONDecoder.init()
let welcome = try! decoder.decode(Welcome.self, from: data)
print(welcome.cities.first!)
}
The decoding helpers. enum CodingKeys are used to convert the lowercase attributes to the uppercase JSON attributes and back.
struct Welcome: Codable {
var regions: [Region]?
let cities: [City]
enum CodingKeys: String, CodingKey {
case regions = "Regions"
case cities = "Cities"
}
}
struct City: Codable {
let id, name: String
enum CodingKeys: String, CodingKey {
case id = "Id"
case name = "Name"
}
}
struct Region: Codable {
let id, name: String
enum CodingKeys: String, CodingKey {
case id = "Id"
case name = "Name"
}
}
Some use services like Quicktype to convert JSON strings to the specific programming language. It makes things faster and simpler.