Auto fill another textfield, More than Two texfield Swift 4 (Use In API )

Here is example code :

1.  TextDidEndEditing (after you end editing text)

 import UIKit
import Alamofire
import SwiftyJson
 
class autoTextViewController: UIViewController, UITextFieldDelegate {
 
    
    @IBOutlet weak var txt1: UITextField!
    @IBOutlet weak var txt2: UITextField!
    @IBOutlet weak var txt3: UITextField!
    
    let myArray = "String1"
    let myArray2 = "String2"
 
    
    override func viewDidLoad() {
        super.viewDidLoad()
    
         txt1.delegate = self
        txt2.delegate = self
        txt3.delegate = self
        
        
        txt1.resignFirstResponder() // to respon text end editing

       
    }
   func textFieldDidEndEditing(_ textField: UITextField) {
        DispatchQueue.main.async {
            NetworkService<WowMobilJenisEntity>.process(client: NetworkClient(endPont: .jenisMobil(mobilId: self.merkIdM)), onSuccess: { dataJ in
                var data: [PickerDataSource] = []
                self.txt2.text = dataJ.data?.first?.jenis ?? ""
            }, onFailure: nil)
        
        
            self.txt3.text = self.myArray2
        }     
     }

    }

2. Use In API  (This exaple use Post and GET data)

import UIKit

class autoTextViewController: UIViewController, UITextFieldDelegate {
 
    
    @IBOutlet weak var txt1: UITextField!
    @IBOutlet weak var txt2: UITextField!
    
  
    var merkIdM: Int = 0
    var tipeId: Int = 0
    
    enum FieldType {
        case merk, tipe
    }
    var fieldType: FieldType = .merk
    
    override func viewDidLoad() {
        super.viewDidLoad()
    
         txt1.delegate = self
        txt2.delegate = self
    
        
        txt1.resignFirstResponder()

       
    }
   
    
   
    @IBAction func txt1DidEnd(_ sender: UITextField) {
        self.fieldType = .merk 
      let param = ["dataSend": txt1.text]
       Alamofire.request("Url", method: .post, parameters: param, encoding: URLEncoding.queryString, headers: nil)
            .responseJSON { response in
                switch response.result {
                case .success(let value):
                    
                case .failure:
                    print("Error")
                }
            }        
    }
    
    @IBAction func txt2DidEnd(_ sender: UITextField) {
        self.fieldType = .tipe
        sender.resignFirstResponder() 
     
             
    }
    
    func textFieldDidEndEditing(_ textField: UITextField) {
       
      var tipe: String?

         init(json: JSON) {
          self.id = json["tipe"].string
       
       }
 
           Alamofire.request("Url", method: .get, parameters: nil, encoding: URLEncoding.queryString, headers: nil)
            .responseJSON { response in
                switch response.result {
                case .success(let value):
                     self.txt2.text = value.data?.first?.tipe ?? ""
                case .failure:
                    print("Error")
                }
            }  
    
   }
    

}

extension autoTextViewController: CustomPickerDelegate {
    func didSelect(data: PickerDataSource?) {
        switch self.fieldType {
        case .merek:
            self.merkView.isiLabel.text = data?.name ?? ""
            self.merkIdM = Int(data?.id ?? "0")!
       
            
        case .jenis:
            self.txt2.text = data?.name ?? ""
            self.tipeId = Int(data?.id ?? "0")!
            
     
        }
    }
}