# Swift Core Data 圖片存儲與讀取Demo
實體的模型定義：?
實體的class定義：
~~~
@objc(ImageEntity)
class ImageEntity: NSManagedObject {
@NSManaged var imageData: NSData
}
~~~
存儲：
~~~
@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)")
}
}
~~~
讀取：
~~~
@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)
}
~~~
## [Demo地址](https://github.com/zhangao0086/CoreDataSaveImageDemo)
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