Question

我有一个名为Task的实体，其中taskImage是二进制数据的属性。我有以下

 @IBOutlet weak var collectionView: UICollectionView!
 var imageSelected = [UIImage]()

然后我有如下的集合视图

 func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

        return self.imageSelected.count

    }

     func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell{
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)
                as! EditCollectionViewCell

            cell.imageView?.image =  imageSelected[(indexPath as NSIndexPath).row]
            cell.layer.borderColor = UIColor.white.cgColor
            cell.layer.borderWidth = 3

              return cell
        }

现在我尝试按下保存栏按钮项目时将图像保存到核心数据，如下所示

 @IBAction func saveBtnPressed(_ sender: AnyObject) {

    if #available(iOS 10.0, *) {
        let context =   (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

        let task = Task(context: context)

        task.taskDesc = taskText.text!
 //task.taskImage = UIImagePNGRepresentation(cell.imageView?.image)

    } else {
        // Fallback on earlier versions
    }

我收到taskImage的错误，任何有关存储图像的帮助都将受到赞赏。

Answer 1

我将图像存储在核心数据中的代码

let appDel:AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let context:NSManagedObjectContext = appDel.managedObjectContext

let newContact = NSEntityDescription.insertNewObjectForEntityForName("Contact", inManagedObjectContext: context)
let imageData:NSData = UIImageJPEGRepresentation(imgViewPhoto.image!, 1)!
newContact.setValue(imageData, forKey: "imageData")

并从coredata

中检索它

let imageData:NSData = contact.valueForKey("imageData") as! NSData
imgViewPhoto.image = UIImage(data: imageData, scale: 1)

如何将图像从collectionviewcell存储到核心数据

1 个答案: