Swift 如何从UICollectionViewCell获取第一个图像并保存在UITableViewCell中

我想保存UICollectionView中的第一个或最后一个图像，并将其作为UIImage保存在UITableView单元格中。如果indexPath==0，则使用第一个indexPath

尝试获取UIImage，然后将其作为NSData保存在CoreData中，但它不起作用。有没有人知道如何在UITableViewCell中显示UIImage？谢谢你的帮助

以下是UICollectionViewCell中的代码：

override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("BookPicCell", forIndexPath: indexPath) as! BookPicCell

    let cellcore = picture[indexPath.row]
    cell.BookImage.image = UIImage(contentsOfFile: cellcore.foto!)

    if indexPath.row == 0 {
        let firstpic = cell.BookImage.image
        let firstcell = UIImagePNGRepresentation(firstpic!)

        let firstimag = NSEntityDescription.insertNewObjectForEntityForName("Book", inManagedObjectContext: self.mgdContext) as! Book
        firstimag.firstimage = firstcell!
    }


    do {
        try self.mgdContext.save()
    } catch {
        print("Error")
    }

    return cell
}

 func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let Cell = BookTableView.dequeueReusableCellWithIdentifier("BookCell", forIndexPath: indexPath) as! BookCell

    let books = book[indexPath.row]
    Cell.BookTitle.text = books.title

    let picturecount = books.picture!.count
    Cell.BookImageCount.text = "\(picturecount) Picture"



    let firstpicture = books.firstimage!
    Cell.BookImage.image = UIImage(data: firstpicture)


    return Cell
}

以下是UITableViewCell中的代码：

override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("BookPicCell", forIndexPath: indexPath) as! BookPicCell

    let cellcore = picture[indexPath.row]
    cell.BookImage.image = UIImage(contentsOfFile: cellcore.foto!)

    if indexPath.row == 0 {
        let firstpic = cell.BookImage.image
        let firstcell = UIImagePNGRepresentation(firstpic!)

        let firstimag = NSEntityDescription.insertNewObjectForEntityForName("Book", inManagedObjectContext: self.mgdContext) as! Book
        firstimag.firstimage = firstcell!
    }


    do {
        try self.mgdContext.save()
    } catch {
        print("Error")
    }

    return cell
}

 func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let Cell = BookTableView.dequeueReusableCellWithIdentifier("BookCell", forIndexPath: indexPath) as! BookCell

    let books = book[indexPath.row]
    Cell.BookTitle.text = books.title

    let picturecount = books.picture!.count
    Cell.BookImageCount.text = "\(picturecount) Picture"



    let firstpicture = books.firstimage!
    Cell.BookImage.image = UIImage(data: firstpicture)


    return Cell
}

“它不起作用”并不能描述你遇到的问题。这一页可能会有帮助：我想知道这段代码是否与
indexPath==0
一起工作，以捕获单元格的第一个图像，或者让任何人知道如何从单元格中获取第一个图像。你知道我可以在那里做些什么来获取图像吗？