ios – 如何使用Xcode 8.2中的Swift 3.0创建和存储包含数据的托管对象

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) {
    }
   }