Parse data from socket.io response swift - ios

Question

I have response from socket io library with response like this
socket.on("response-names") { data, ack in
print(data)
}
can print this,
[{
"person": [{
"_id":"56512323212132",
"name":"John Smith",
"id":"0000001",
"geolocation":{
"latitude":5.12312323443,
"longitude":101.12312464564354
}
}]
}]
How do you guys access the name, id and the geolocation(lat, long) in swift ?,
As far as I know the data is NSArray. but accessing is with data[0] will produce nil. but i can do data.count which will return with 1.
Thank you

Answer 1

Finally i solved it, just for future reference for others. It looks like you need to know the type before you parsing it. and check it with print.
and the debug code really helping, something like NSCFArray means your data as NSArray and try to read from that.
let dataArray = data as NSArray
let dataString = dataArray[0] as! String
let dataNewNow = dataString.data(using: String.Encoding.utf8, allowLossyConversion: false)!
do {
let json = try NSJSONSerialization.JSONObjectWithData(dataNewNow, options: []) as! [String: AnyObject]
let str = json["person"] as! NSArray
let str2 = str[0] as! NSDictionary
let personName = str2["name"] as! String
let personId = str2["id"] as! String
let personGeoLocation = str2["geolocation"] as! NSDictionary
let personLatitude = personGeoLocation["latitude"] as! NSNumber
let personLongitude = personGeoLocation["longitude"] as! NSNumber
print("personName =", personName)
print("personID =", personId)
print("Person Latitude =", personLatitude)
print("Person Longitude =", personLongitude)
} catch let error as NSError {
print("Failed to load: \(error.localizedDescription)")
}

Answer 2

in my case this worked
let dataArray = data as NSArray
let dataString = dataArray[0] as! String
let dataNewNow = dataString.data(using: String.Encoding.utf8, allowLossyConversion: false)!
do {
let json = try JSONSerialization.jsonObject(with: dataNewNow, options: []) as! [String: AnyObject]
let nMsgType = json["msg_type"] as! String
print(nMsgType)
} catch let error as NSError {
print("Failed to load: \(error.localizedDescription)")
}

Answer 3

I know it's a very old question but my answer may help someone ... In today's swift 5 it's very easy than before...
Create a SocketParser and use the below code to parse data...
class SocketParser {
static func convert<T: Decodable>(data: Any) throws -> T {
let jsonData = try JSONSerialization.data(withJSONObject: data)
let decoder = JSONDecoder()
do{
let _ = try decoder.decode(T.self, from: jsonData)
}catch{
createLog("CheckError \(error)")
}
return try decoder.decode(T.self, from: jsonData)
}
}
Now Create a simple model for your JSON ... in you case as bellow...
import Foundation
// MARK: - WelcomeElement
struct WelcomeElement: Codable {
let person: [Person]
}
// MARK: - Person
struct Person: Codable {
let id, name, personID: String
let geolocation: Geolocation
enum CodingKeys: String, CodingKey {
case id = "_id"
case name
case personID = "id"
case geolocation
}
}
// MARK: - Geolocation
struct Geolocation: Codable {
let latitude, longitude: Double
}
It's time to use these in response as below...
socket.on("response-names") { data, ack in
guard let data = data.first else{
return
}
if let response : WelcomeElement = try? SocketParser.convert(data: data) {
print(responce)
}