How do I use JSON element with alamofire

Question

I am using two textfields to pass login information to the PHP web service using Alamofire in the following way.

    @IBAction func LoginButton(_ sender: Any) {

   //getting the username and password
    let parameters: Parameters=[
    "Name":TextFieldUserName.text!,
    "Pass":TextFieldPassword.text!
    ]

    Alamofire.request(URL_USER_LOGIN, method: .post, parameters: parameters).responseJSON
    {
    response in
  //printing response
    print(response)

The following Json data is received on login.

[{"code":0,"message":"Check Username and Password....","userid":""}]

I want to use either "code" value (0 for false and 1 for true) or "message" value as String to put into an if - else statement for further steps. If Alamofire is not the best way to go about this, can someone please show another way. Thanks in advance for the help.

Mikhail Sein · Answer 1 · 2018-11-01T14:41:10.547

0

Do you need to deserialize the response from the server?

The easiest option is parsing response value as NSDictionary

if let JSON = response.result.value as? NSDictionary {
    let code = JSON.value(forKey: "code") as? Int
    let message = JSON.value(forKey: "message") as? String
}

You can also use the Codable protocol and the JSONDecoder to decode this response into your structure.

For example, declare struct:

struct LoginResponse: Codable {
    var code: Int
    var message: String
}

and decode response using JSONDecoder

let jsonDecoder = JSONDecoder()
let loginResponse = try? jsonDecoder.decode(LoginResponse.self, from: response.data)

edited Nov 01 '18 at 14:41

answered Nov 01 '18 at 14:32

Mikhail Sein

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Hi! Thanks for the response. However when I print(JSON) or print(code) or print(message)I get a blank output. Can you please help me? – Edwin Joseph Nov 02 '18 at 07:09
@EdwinJoseph Do u see json output if u write it? : if let json = response.result.value as? [String: Any] { print("JSON: \(json)") } – Mikhail Sein Nov 02 '18 at 07:15
also write value of response.result, maybe the request failed – Mikhail Sein Nov 02 '18 at 07:20
I don't see any output when I write: if let json = response.result.value as? [String: Any] { print("JSON: (json)") } – Edwin Joseph Nov 02 '18 at 09:06
@EdwinJosephso maybe request was failed, check it. and maybe some debug alamofire request errors exists – Mikhail Sein Nov 02 '18 at 09:43
@EdwinJoseph your LOGIN URL have https? if not - did u add your domain at App Transport Security Settings in info.plist? – Mikhail Sein Nov 02 '18 at 09:47
it has http not https. Do I still need to do it? – Edwin Joseph Nov 03 '18 at 14:46
@EdwinJoseph You have to set the NSAllowsArbitraryLoads key to YES under NSAppTransportSecurity dictionary in your .plist file. https://stackoverflow.com/a/31807139/6583801 – Mikhail Sein Nov 05 '18 at 13:25
@EdwinJoseph for details we need to watch debug logs – Mikhail Sein Nov 05 '18 at 13:26

How do I use JSON element with alamofire

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