设备旋转后，CollectionViewCell图像会重置吗？

如何解决设备旋转后，CollectionViewCell图像会重置吗？

好吧，所以我想做的是一个图库应用，其中我在一个视图控制器（图像网格）中有一个集合视图，当有人单击图像时，它将加载到具有另一个集合视图的新视图控制器中，然后滑动即可更改图像（手动滑动图像）。 btw图片是从Firebase数据库加载的。

这是我的第一个视图控制器（网格视图），叫它：GridView.swift

import UIKit
import Firebase
import FirebaseDatabase
import SDWebImage
import JJFloatingActionButton

class DoceVC: UIViewController,UICollectionViewDataSource,UICollectionViewDelegate {


@IBOutlet weak var imageCollection: UICollectionView!

let actionButton = JJFloatingActionButton()

var customImageFlowLayout: CustomImageFlowLayout!

var images = [ChudoInsta]()


var dbRef: DatabaseReference!

let viewImageSegueIdentifier = "viewImageSegueIdentifier"

override func viewDidLoad() {
    
    super.viewDidLoad()
    
    dbRef = Database.database().reference().child("wedding/doce_pics")

  loadDB()
    
   customImageFlowLayout = CustomImageFlowLayout()
    imageCollection.collectionViewLayout = customImageFlowLayout
    imageCollection.backgroundColor = .white
    

    actionButton.buttonColor = .black
    
    actionButton.addItem(title: "start slideshow",image: UIImage(named: "largeplay")?.withRenderingMode(.alwaysTemplate)) { item in
      // do something for testing purpose
        print("hello im starting slideshow")
        
        let vc = self.storyboard?.instantiateViewController(identifier: "Slide Show") //as! SlideShowVC
        
        self.navigationController?.pushViewController(vc!,animated: false)
    }
    
    

    actionButton.display(inViewController: self)
    

    
}

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    
    customImageFlowLayout.setupLayout()
    DispatchQueue.main.async {
        self.imageCollection.reloadData()
    }
    
}
func loadDB(){
    dbRef.observe(DataEventType.value,with: { (snapshot) in
        var newImages = [ChudoInsta]()
        
        for chudoInstaSnapshot in snapshot.children {
            let chudoInstaObject = ChudoInsta(snapshot: chudoInstaSnapshot as! DataSnapshot)
            newImages.append(chudoInstaObject)
        }
    
        self.images = newImages
    self.imageCollection.reloadData()
    })
  }
    func collectionView(_ collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int {
      return images.count
    
  }

     func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
      let cell = imageCollection.dequeueReusableCell(withReuseIdentifier: "Cell",for: indexPath) as! ImageCollectionViewCell
    
     let image = images[indexPath.row]
    
    
      cell.imageView.sd_setImage(with: URL(string: image.imageUrl),placeholderImage: UIImage(named: "load"))
    
     return cell
    }

    func collectionView(_ collectionView: UICollectionView,didSelectItemAt indexPath: IndexPath) {
    print("ItemSelected \(indexPath)")
    //Sending the selected cell(image) from 1st CollectionViewCell(grid) to another second ViewController collectionView.
    let vc = self.storyboard?.instantiateViewController(identifier: "DoceFullImageVIew") as! DoceFullImageVIew
    vc.path = indexPath.row
    
    self.navigationController?.pushViewController(vc,animated: false) 
   }    
}

这是第二个视图控制器的代码：让我们称之为second.swift

import UIKit
import Firebase
import FirebaseDatabase
import SDWebImage
import Zoomy


class DoceFullImageVIew: UIViewController {


@IBOutlet weak var colltionView: UICollectionView!

var images = [ChudoInsta]()


var dbRef: DatabaseReference!

var path = Int()



let viewImageSegueIdentifier = "doceImageSegueIdentifier"

override func viewDidLoad() {
    super.viewDidLoad()
    
    dbRef = Database.database().reference().child("wedding/doce_pics")
    
    loadDB()
}

override func viewDidLayoutSubviews() {
 
  // Opening or scrolling to the image from first view controller when the second view controller loads


   colltionView.scrollToItem(at:IndexPath(item: path,section: 0),at: .right,animated: false)
}

 override func viewWillTransition(to size: CGSize,with coordinator: UIViewControllerTransitionCoordinator) {
     super.viewWillTransition(to: size,with: coordinator)

     // Have the collection view re-layout its cells.
     coordinator.animate(
          alongsideTransition: { _ in self.colltionView.collectionViewLayout.invalidateLayout() },completion: { _ in }
     )
    
    self.colltionView.reloadData()
    
}


func loadDB(){
    dbRef.observe(DataEventType.value,with: { (snapshot) in
        var newImages = [ChudoInsta]()
        
        for chudoInstaSnapshot in snapshot.children {
            let chudoInstaObject = ChudoInsta(snapshot: chudoInstaSnapshot as! DataSnapshot)
            newImages.append(chudoInstaObject)
        }
        
        self.images = newImages
        self.colltionView.reloadData()
    })
}



func printvalue() {
    
    print("This is the doce full image firebase \(images)")
}


@IBAction func SaveImageDoce(_ sender: Any) {
    
    print("save pressed")
    
    var visibleRect = CGRect()
    visibleRect.origin = colltionView.contentOffset
    visibleRect.size = colltionView.bounds.size
    let visiblePoint = CGPoint(x: CGFloat(visibleRect.midX),y: CGFloat(visibleRect.midY))
    let visibleIndexPath = colltionView.indexPathForItem(at: visiblePoint)
    print("Visible cell's index is : \(String(describing: visibleIndexPath?.row))!")
    let save = self.collectionView(colltionView,cellForItemAt: visibleIndexPath!)
    let savepress = save as! DataCollectionViewCell
    let dialogMessage = UIAlertController(title: "Confirm",message: "Are you sure you want to Download this image?",preferredStyle: .alert)

    // Create OK button with action handler
    let ok = UIAlertAction(title: "OK",style: .default,handler: { (action) -> Void in
         print("Ok button click...")
         UIImageWriteToSavedPhotosAlbum(savepress.img.image!,nil,nil)
    })

    // Create Cancel button with action handlder
    let cancel = UIAlertAction(title: "Cancel",style: .cancel) { (action) -> Void in
        print("Cancel button click...")
    }

    //Add OK and Cancel button to dialog message
    dialogMessage.addAction(ok)
    dialogMessage.addAction(cancel)

    // Present dialog message to user
    self.present(dialogMessage,animated: true,completion: nil)
      
    
      }

 }

    extension DoceFullImageVIew: UICollectionViewDelegate,UICollectionViewDataSource {

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

func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell",for: indexPath) as? DataCollectionViewCell
    
    let image = images[indexPath.row]
    
   addZoombehavior(for: cell?.img as! Zoomable)
    
    cell?.img.sd_setImage(with: URL(string: image.imageUrl),placeholderImage: UIImage(named: "load"))
    
    
    return cell!
    
    }

 }

    extension DoceFullImageVIew: UICollectionViewDelegateFlowLayout {
     func collectionView(_ collectionView: UICollectionView,layout collectionViewLayout: UICollectionViewLayout,sizeForItemAt indexPath: IndexPath) -> CGSize {
    let size = collectionView.bounds
    return CGSize(width: size.width,height: size.height)
    
    
}

func collectionView(_ collectionView: UICollectionView,insetForSectionAt section: Int) -> UIEdgeInsets {
    return UIEdgeInsets(top: 0,left: 0,bottom: 0,right: 0)
}

func collectionView(_ collectionView: UICollectionView,minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
    return 0
}

  func collectionView(_ collectionView: UICollectionView,minimumLineSpacingForSectionAt section: Int) -> CGFloat {
    return 0
    }

}

所以我的问题是，当我打开第二个视图控制器并滚动到其中的另一个图像并旋转设备时，该图像会自动回滚到初始图像（从第一个视图控制器打开的图像） 。我猜想当旋转发生时，viewDidLoad（）下的代码将再次执行。我怎样才能安全地实现自己的目标？ 这是一个视觉表示：from left to right,how the images scrolls back to initial image after device rotation