How to implement simple MVC design patern in swift?

I am new to MVC design pattern. I created "DataModel" it will make an API call, create data, and return data to the ViewController using Delegation and "DataModelItem" that will hold all data. How to call a DataModel init function in "requestData" function. Here is my code.

protocol DataModelDelegate:class {
    func didRecieveDataUpdata(data:[DataModelItem])
    func didFailUpdateWithError(error:Error)
}

class DataModel: NSObject {
    weak var delegate : DataModelDelegate?
    func requestData() {

    }
    private func setDataWithResponse(response:[AnyObject]){
        var data = [DataModelItem]()
        for item in response{
            if let tableViewModel = DataModelItem(data: item as? [String : String]){
                data.append(tableViewModel)
            }
        }
        delegate?.didRecieveDataUpdata(data: data)
    }
}

And for DataModelItem :

class DataModelItem{
    var name:String?
    var id:String?

    init?(data:[String:String]?) {
        if let data = data, let serviceName = data["name"] , let serviceId = data["id"] {
            self.name = serviceName
            self.id = serviceId
        }
        else{
            return nil
        }
    }
}

Controller :

class ViewController: UIViewController {
    private let dataSource = DataModel()
    override func viewDidLoad() {
        super.viewDidLoad()
        dataSource.delegate = self
    }

    override func viewWillAppear(_ animated: Bool) {
        dataSource.requestData()
    }

}
extension ViewController : DataModelDelegate{
    func didRecieveDataUpdata(data: [DataModelItem]) {
        print(data)
    }

    func didFailUpdateWithError(error: Error) {
        print("error:  \(error.localizedDescription)")
    }


}