Parsing JSON Response

In the previous section of this tutorial, we discussed making get request using Alamofire. We had created a project in which we used tableview to display the artist’s information in the application.

In this section of the tutorial, we will extend that project by creating a response model, and we will parse the response data in the response model.

To create the response model, we need to create a new swift file by command + n short key and choose the swift file.

The ArtistResponseModel class should be a base class of Decodable in swift.

ArtistResponseModel.swift

  import Foundation    class ArtistResponseModel:Decodable{      public var resultCount:Int?      public var results:[Results]?  }    class Results : Decodable{      public var wrapperType : String?      public var kind : String?      public var artistId : Int?      public var collectionId : Int?      public var trackId : Int?      public var artistName : String?      public var collectionName : String?      public var trackName : String?      public var collectionCensoredName : String?      public var trackCensoredName : String?      public var artistViewUrl : String?      public var collectionViewUrl : String?      public var trackViewUrl : String?      public var previewUrl : String?      public var artworkUrl30 : String?      public var artworkUrl60 : String?      public var artworkUrl100 : String?      public var collectionPrice : Double?      public var trackPrice : Double?      public var releaseDate : String?      public var collectionExplicitness : String?      public var trackExplicitness : String?      public var discCount : Int?      public var discNumber : Int?      public var trackCount : Int?      public var trackNumber : Int?      public var trackTimeMillis : Int?      public var country : String?      public var currency : String?      public var primaryGenreName : String?      public var isStreamable : Bool?  }  

To parse the response in Alamofire API request, we will use JSONDecoder, which is an object that decodes instances of a data type from JSON objects.

The decode method of JSONDecoder is used to decode the JSON response. It returns the value of the type we specify, decoded from a JSON object. The syntax is given below.

Here, we will pass the instance of ArtistResponseModel and response data. The syntax is given below.

  do{  let result: ArtistResponseModel = try JSONDecoder().decode(ArtistResponseModel.self, from: response.data!)  }  catch{  }  

It will return the instance of ArtistResponseModel, which now contains the parsed json response.

The ViewController.swift file has the following code.

ViewController.swift

  import UIKit  import Alamofire    class ViewController: UIViewController {        @IBOutlet weak var tableView: UITableView!            var artist = Array<Results>()            override func viewDidLoad() {          super.viewDidLoad()          // Do any additional setup after loading the view.          loadJsonData()          tableView.delegate = self          tableView.dataSource = self          //tableView.rowHeight = UITableView.automaticDimension      }      func loadJsonData()      {         Alamofire.request(“https://itunes.apple.com/search?media=music&term=bollywood”).responseJSON { (response) in              //print(“Response value (response)”)          do{              if(response.result.isSuccess){                  let result: ArtistResponseModel = try JSONDecoder().decode(ArtistResponseModel.self, from: response.data!)                  debugPrint(result)                  self.artist = result.results ?? []                  self.tableView.reloadData()          }                        }catch{                        }          }                }  }      extension ViewController : UITableViewDataSource{      func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {          return artist.count      }            func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {          let cell = tableView.dequeueReusableCell(withIdentifier: “MainTableViewCell”) as! MainTableViewCell          if(artist.count > 0){              do{              let artistData = artist[indexPath.row]                  cell.artistImgView.image = try UIImage(data: Data(contentsOf: URL(string: artistData.artworkUrl60!) ?? URL(string: “http://www.google.com”)!))                  cell.trackName.text = artistData.trackName                  cell.artisName.text = artistData.artistName                  cell.artistCountry.text = artistData.country              }catch{                                }                        }          return cell                }              }  extension ViewController : UITableViewDelegate{      func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {          return 220      }        }  

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