使用CoreData插入多个对象

let appDelegate = UIApplication.shared.delegate as! AppDelegate
let context = appDelegate.persistentContainer.viewContext

let entity = NSEntityDescription.entity(forEntityName: "EntityName", in: context)!
let object = NSManagedObject(entity: entity, insertInto: context)

object.setValue("属性值", forKey: "属性名")

try? context.save()

for i in 0..<10 {
    let object = NSManagedObject(entity: entity, insertInto: context)
    object.setValue("属性值\(i)", forKey: "属性名")
}
try? context.save()