import UIKit
import CoreData

class ViewController: UIViewController {

    let managedObjectContext = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext         
   override func viewDidLoad() {
        super.viewDidLoad()         
    }
    @IBAction func SaveContact(_ sender: Any) {
        let entityDescription = NSEntityDescription.entity(forEntityName: "Contacts",in: managedObjectContext)

        let contact = Contacts(entity: entityDescription!,insertInto: managedObjectContext) // Error: Use of unresolved identifier 'Contacts'
    }
    @IBAction func Findcontact(_ sender: Any) {
    }
   }