实体的模型定义：

实体的class定义：

@objc(ImageEntity)class ImageEntity: NSManagedObject { @NSManaged var imageData: NSData }

存储：

@IBAction func saveImageToCoreData() {    let delegate = UIApplication.sharedApplication().delegate as AppDelegate    let context = delegate.managedObjectContext let imageData = UIImagePNGRepresentation(UIImage(named: "image")) let imageEntity = NSEntityDescription.entityForName("ImageEntity", inManagedObjectContext: context!) let image = ImageEntity(entity: imageEntity!, insertIntoManagedObjectContext: context!) image.imageData = imageData var error: NSError? if context!.save(&error) == false { println("failed: \(error!.localizedDescription)") } }

读取：

@IBAction func loadImageFromCoreData() {    let delegate = UIApplication.sharedApplication().delegate as AppDelegate    let context = delegate.managedObjectContext let request = NSFetchRequest(entityName: "ImageEntity") var error: NSError? let imageEntities = context?.executeFetchRequest(request, error: &error) let imageEntity = imageEntities?.first! as ImageEntity self.imageView.image = UIImage(data: imageEntity.imageData) }