Agfdhyk

I want to turn my array into generic with my code. I'm new when it comes to generics.

Here is my code:

class APIServices {

    static let youtubeBaseURL = "https://www.googleapis.com/youtube/v3/search"



    static let shared = APIServices()



    func fetchVideo(name: String, completionHandler: @escaping ([Item]) -> ()) {

        let apiKey = "mykey"

        let params = ["part": "snippet", "q": "tausiyah (name)", "key": apiKey]



        Alamofire.request(APIServices.youtubeBaseURL, method: .get, parameters: params, encoding: URLEncoding.default, headers: nil).responseData { (dataResponse) in

            if let err = dataResponse.error {

                print("Failed to get data:", err)

                return

            }

            guard let data = dataResponse.data else { return }



            do {

                let youtubeData = try JSONDecoder().decode(YoutubeModel.self, from: data)



                completionHandler(youtubeData.items)

            } catch let decodeErr {

                print("Failed to decode youtube data:", decodeErr)

            }

        }

    }

}

here my YoutubeModel

struct YoutubeModel: Decodable {

var items: [Item]

}



struct Item: Decodable {

   var id: VideoId

   var snippet: Snippet

}



struct VideoId: Decodable {



var videoId: String



init(dictionary: [String: Any]) {

    self.videoId = dictionary["videoId"] as? String ?? ""

  }

}



struct Snippet: Decodable {



   func encode(with aCoder: NSCoder) {

      aCoder.encode(title, forKey: "titleStringKey")

   }



   var title: String

}

In the completionHandler: @escaping ([item]) that I want to turn into generic. How can I change completionHandler below JSONDecoder?

You can try the below generic implementation,

public class YoutubeModel<T: Decodable>: Decodable {



    public var items: [T] = 

}



class APIServices {

    static let youtubeBaseURL = "https://www.googleapis.com/youtube/v3/search"



    static let shared = APIServices()



    func fetchVideo<T: Decodable>(name: String, of type: T.Type, completionHandler: @escaping ([T]) -> ()) {

        let apiKey = "mykey"

        let params = ["part": "snippet", "q": "tausiyah (name)", "key": apiKey]



        Alamofire.request(APIServices.youtubeBaseURL, method: .get, parameters: params, encoding: URLEncoding.default, headers: nil).responseData { (dataResponse) in

            if let err = dataResponse.error {

                print("Failed to get data:", err)

                return

            }

            guard let data = dataResponse.data else { return }



            do {

                let youtubeData = try JSONDecoder().decode(YoutubeModel<T>.self, from: data)



                completionHandler(youtubeData.items)

            } catch let decodeErr {

                print("Failed to decode youtube data:", decodeErr)

            }

        }

    }

}

Usage

APIServices.shared.fetchVideo(name: "name", of: Item.self) { list in

    print(list)

}