UICollectionView访问另一个CollectionView的indexPath Cell

Question

我有这个主页是PhotoStreamViewController，它有一个CollectionView，我想要发生的是当我从PhotoStreamController点击collectionView的一张图片时，它会自动转到DetailStreamController的页面集合View然后我可以从PhotoStreamViewController向左和向右滑动相同的照片，我的问题是从PhotoStreamViewController到DetailStreamController的segue。     导入UIKit

class Photo {

    class func allPhotos() -> [Photo] {
        var photos = [Photo]()
        if let URL = Bundle.main.url(forResource: "Photos 2", withExtension: "plist") {
            print(URL)
            if let photosFromPlist = NSArray(contentsOf: URL) {
                print(photosFromPlist)

                for dictionary in photosFromPlist {
                    let photo = Photo(dictionary: dictionary as! NSDictionary)
                    photos.append(photo)
                }
            }
        }
        return photos
    }

    var image: UIImage
    init(image: UIImage) {
        self.image = image
    }

    convenience init(dictionary: NSDictionary) {
        let photo = dictionary["imageName"] as? String
        let image = UIImage(named: photo!)?.decompressedImage
        self.init(image: image!)
    }
}

这是我的PhotoStreamController代码

import UIKit
    class PhotoStreamViewController: UIViewController,UICollectionViewDataSource, UICollectionViewDelegate {

        var parentController: UIViewController?   

        @IBOutlet var photoStream: UICollectionView!

        var photos = Photo.allPhotos()


        override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
         if let cell = sender as? UICollectionViewCell {

            if let indexPath = self.photoStream?.indexPath(for: cell) {
            if segue.identifier == "StreamToStreamDeatilController" {
                let photoViewController : StreamDetailController = segue.destination     as! StreamDetailController
                photoViewController. " I dont know what to put here" this is the missing code. cause I cant access the Class Photo
                }
             } 
           }
         }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return photos.count
    }

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

        let cellA = collectionView.dequeueReusableCell(withReuseIdentifier: "Celler", for: indexPath) as! AnnotatedPhotoCell
        cellA.box = Box(fImage: photos[indexPath.row].image)
        return cellA
    }
}

  func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        if let paper = photoDataSource.photoForItemAtIndexPath(indexPath) {
           performSegue(withIdentifier: "StreamToStreamDeatilController", sender: paper)
        }
    }
}

ExtraViewCell

StreamDetailController