使用Firebase将图像从一个视图控制器传递到另一个（swift）

debugcn 发表于 Dev

哈拉德

我试图将图像从一个视图控制器传递到另一个，但在准备segue功能时遇到错误

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {


        let post = posts[indexPath.row]

        if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)as? collectionViewCellBooks {

            if let img = booksVC.imageCache.object(forKey: post.imageUrl as NSString) {
                cell.configureCell(post: post, img: img)
                return cell

        }else {

                cell.configureCell(post: post)
                return cell
            }
        }
            else {
                return collectionViewCellBooks()
            }

    }

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        self.performSegue(withIdentifier: "showImage", sender: self)
    }



    override func prepare(for segue: UIStoryboardSegue, sender: Any?)
    {

         if segue.identifier == "showImage"
         {

         let indexPaths = self.collectionView!.indexPathsForSelectedItems!
         let indexPath = indexPaths[0] as IndexPath
         let vc = segue.destination as! newViewController
        // vc.image = self.posts[(indexPath as NSIndexPath).row]
            vc.image = self.posts[indexPath.row]
         }





class newViewController: UIViewController {

    @IBOutlet weak var imageView: UIImageView!

    var image = UIImage()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.imageView.image = self.image
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

这是我的邮政课

类Post {

private var _caption: String!
private var _imageUrl: String!
private var _postKey: String!



var caption: String {
    return _caption
}

var imageUrl: String {
    return _imageUrl
}

var postKey: String {
    return _postKey
}


init(caption: String, imageUrl: String) {

    self._caption = caption
    self._imageUrl = imageUrl
}

init(postKey: String, postData: Dictionary<String, AnyObject>) {

    self._postKey = postKey

    if let caption = postData["title"] as? String {
        self._caption = caption
    }
    if let imagesUrl = postData["imageURL"] as? String {
        self._imageUrl = imagesUrl
    }

}

}

title和imageURL保存在firebase数据库中

ShujatAli

您可以尝试在preparese segue方法中进行以下更改吗..让我知道

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    {

         if segue.identifier == "showImage"
         {

         let indexPaths = self.collectionView!.indexPathsForSelectedItems!
         let indexPath = indexPaths[0] as IndexPath
         let vc = segue.destinationViewController as! newViewController

         let post = posts[indexPath.row]
         if let img = booksVC.imageCache.object(forKey: post.imageUrl as NSString) {
                vc.image = img
         }
       }
    }


class newViewController: UIViewController {

    @IBOutlet weak var imageView: UIImageView!

    var image = nil

    override func viewDidLoad() {
        super.viewDidLoad()

        if self.image {
         self.imageView.image = self.image
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

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