Swift 4.0 -- CoreData

https://medium.com/xcblog/core-data-with-swift-4-for-beginners-1fc067cca707

Save:

let appDelegate1=UIApplication.shared.delegate as! AppDelegate

let context=appDelegate1.persistentContainer.viewContext

        let entity=NSEntityDescription.entity(forEntityName: "UserDetails", in: context)

        let objMode=NSManagedObject(entity: entity!, insertInto: context)

        objMode.setValue("asfff",forKey:"userId")

        do {

            try context.save()

        } catch {

            print("Failed saving")

        }

        

Fetch:

        let request = NSFetchRequest<NSFetchRequestResult>(entityName:"UserDetails")

        request.returnsObjectsAsFaults=false

        do {

            let result=try context.fetch(request)

            for data in result as! [NSManagedObject] {

              print(data.value(forKey: "userId") as! String)

            }

            

        } catch  {

             print("Failed")

        }