Hello after long time I am writing this blog regarding use of Alamofire with Codable model object for the ease of MVC architecture.
Let’s rewind with some of the post which is used to cover this point:

Let see about use of Alamofire with Codable model object

Step 1 – Create Codable object based on JSON response.

Here I am taking an example of a web service which contains JSON related to the contact.

{
 "id": "c200",
 "name": "Ravi Tamada",
 "email": "ravi@gmail.com",
 "address": "xx-xx-xxxx,x - street, x - country",
 "gender" : "male",
 "phone": {
 "mobile": "+91 0000000000",
 "home": "00 000000",
 "office": "00 000000"
 }
}

{

"id": "c200",

"name": "Ravi Tamada",

"email": "ravi@gmail.com",

"address": "xx-xx-xxxx,x - street, x - country",

"gender" : "male",

"phone": {

"mobile": "+91 0000000000",

"home": "00 000000",

"office": "00 000000"

}

So, we can create two Codable files from this JSON as per hierarchy. These would be like as follows:

struct Contact: Codable {
 var id : String
 var name : String
 var email : String
 var address : String
 var gender : String
 var phone : Phone
}
struct Phone: Codable {
 var mobile : String
 var home : String
 var office : String
}

struct Contact: Codable {

var id : String

var name : String

var email : String

var address : String

var gender : String

var phone : Phone

}

struct Phone: Codable {

var mobile : String

var home : String

var office : String

}

As you can see we have created 2 objects Contact and Phone. Here Phone is in sub hierarchy.

Step 2 – Let’s update AFWrapper

As we have previously revised blogs, there is a blog mentioned about to create a wrapper of the Alamofire and SwiftyJSON. We have to replace the SwiftyJSON code to return normal dictionary objects, and after that we will convert that dictionary to the Codable object.
So here I have updated the AFWrapper class file to do that thing:

import UIKit
import Alamofire
class AFWrapper: NSObject {
    class func requestGETURL(_ strURL: String, success:@escaping ([String : Any]) -&gt; Void, failure:@escaping (Error) -&gt; Void) {
        Alamofire.request(strURL).responseJSON { (responseObject) -&gt; Void in
            print(responseObject)
            if responseObject.result.isSuccess {
                success(responseObject.result.value! as! [String : Any])
            }
            if responseObject.result.isFailure {
                let error : Error = responseObject.result.error!
                failure(error)
            }
        }
    }
}

import UIKit

import Alamofire

class AFWrapper: NSObject {

class func requestGETURL(_ strURL: String, success:@escaping ([String : Any]) -> Void, failure:@escaping (Error) -> Void) {

Alamofire.request(strURL).responseJSON { (responseObject) -> Void in

print(responseObject)

if responseObject.result.isSuccess {

success(responseObject.result.value! as! [String : Any])

}

if responseObject.result.isFailure {

let error : Error = responseObject.result.error!

failure(error)

}

Step 3 – Implement and convert the response in object

We will call a web service which contain that kind of JSON response. And after calling the web-service we will decode the object to create the Codable object.

import UIKit
class ViewController: UIViewController {
    var arrContacts = [Contact]()
    @IBOutlet var txtContacts: UITextView!
    override func viewDidLoad() {
        super.viewDidLoad()
        AFWrapper.requestGETURL("https://api.androidhive.info/contacts/", success: { (responseObject) in
            print(responseObject)
            for aContact in responseObject["contacts"] as! [Any] {
                do {
                    let jsonData = try JSONSerialization.data(withJSONObject: aContact, options: .prettyPrinted)
                    let reqJSONStr = String(data: jsonData, encoding: .utf8)
                    let data = reqJSONStr?.data(using: .utf8)
                    let jsonDecoder = JSONDecoder()
                    let aContact = try jsonDecoder.decode(Contact.self, from: data!)
                    self.arrContacts.append(aContact)
                    self.txtContacts.text = self.txtContacts.text + aContact.name + " " + aContact.phone.mobile + "\n"
                    print(self.arrContacts)
                }
                catch {
                }
            }
        }) { (error) in
            print(error.localizedDescription)
        }
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

import UIKit

class ViewController: UIViewController {

var arrContacts = [Contact]()

@IBOutlet var txtContacts: UITextView!

override func viewDidLoad() {

super.viewDidLoad()

AFWrapper.requestGETURL("https://api.androidhive.info/contacts/", success: { (responseObject) in

print(responseObject)

for aContact in responseObject["contacts"] as! [Any] {

do {

let jsonData = try JSONSerialization.data(withJSONObject: aContact, options: .prettyPrinted)

let reqJSONStr = String(data: jsonData, encoding: .utf8)

let data = reqJSONStr?.data(using: .utf8)

let jsonDecoder = JSONDecoder()

let aContact = try jsonDecoder.decode(Contact.self, from: data!)

self.arrContacts.append(aContact)

self.txtContacts.text = self.txtContacts.text + aContact.name + " " + aContact.phone.mobile + "\n"

print(self.arrContacts)

}

catch {

}

}) { (error) in

print(error.localizedDescription)

}

override func didReceiveMemoryWarning() {

super.didReceiveMemoryWarning()

// Dispose of any resources that can be recreated.

}

In above sample I have added one text view in the view controller and I am fetching the data from the contacts API. After that using JSONSerialization and JSONDecoder we will get our decoded Contact object with Phone object.

Conclusion

Swift 4 comes with so many updates. We are going to have a great time exploring them all and finding out so much more by using it on further projects. We have learned about Codable and use of it. You too should go check it out and share your experiences with us in the comments section.
Hope you liked the article.
Happy Coding 🙂

How to use Alamofire with Codable in Swift?

Let see about use of Alamofire with Codable model object

Step 1 – Create Codable object based on JSON response.

Step 2 – Let’s update AFWrapper

Step 3 – Implement and convert the response in object

Conclusion

Use of Codable and Coding Key with JSONEncoder and JSONDecoder in Swift 4