왜 내 UIImageView는 항상 nil입니까?

Question

도움이 필요합니다. popover에서 선택한 사진을 mainController의 UIImageView으로 전달할 때마다 항상 이 아닌이 표시됩니다. 그 문제를 해결하는 방법? 저를 도와주세요, 나는 그것을 해결하기 위해 하루를 보내고 실패했습니다. 여기

import Foundation 
import UIKit 

class AddAdvertise: UIViewController { 

    var data = SkelbimasModel.init() 
    var nuotraukuKiekis = [UIImage]() 

    //pazymetu nuotrauku placeholderiai 
    @IBOutlet weak var ImagePlaceHolder00: UIImageView! 
    @IBOutlet weak var ImagePlaceHolder01: UIImageView! 
    @IBOutlet weak var ImagePlaceHolder02: UIImageView! 
    @IBOutlet weak var ImagePlaceHolder03: UIImageView! 
    @IBOutlet weak var ImagePlaceHolder04: UIImageView! 
    @IBOutlet weak var ImagePlaceHolder05: UIImageView! 

    @IBOutlet weak var NavBar: UINavigationBar! 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     ImagePlaceHolder00.image = UIImage(named: "ok.png") 

     NavBar.topItem?.title = data.kategorija 
     self.view.backgroundColor = data.Color 
    } 
    @IBAction func ClickToPhotos(_ sender: Any) { 
     let popOverVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "Pictures") as! PicturesCollectionViewController 
     self.addChildViewController(popOverVC) 
     popOverVC.view.frame = self.view.frame 
     self.view.addSubview(popOverVC.view) 
     popOverVC.didMove(toParentViewController: self) 
    } 
    func NuotraukuKiekis(pazymetuNuotraukuKiekis: [UIImage]){ 
     for nuotrauka in pazymetuNuotraukuKiekis { 
      nuotraukuKiekis.append(nuotrauka) 
     } 
     ImagePlaceHolder00.image = nuotraukuKiekis[0] // <<<------ Here i get NIL 
     // ImagePlaceHolder01.image = pazymetuNuotraukuKiekis[1] 
     // ImagePlaceHolder02.image = pazymetuNuotraukuKiekis[2] 
     // ImagePlaceHolder03.image = pazymetuNuotraukuKiekis[3] 
     // ImagePlaceHolder04.image = pazymetuNuotraukuKiekis[4] 
     //ImagePlaceHolder05.image = pazymetuNuotraukuKiekis[5] 
    } 
} 

그리고 내 팝 오버 코드입니다 :

import UIKit 
    import Photos 

class PicturesCollectionViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource{ 

    @IBOutlet weak var ColView: UICollectionView! 
    private let reuseIdentifier = "Cell" 
    var imageArray = [UIImage]() 
    var selectedImages = [UIImage]() 


    func grabPhotos() { 

     let imgManager = PHImageManager.default() 

     let requestOption = PHImageRequestOptions() 

     requestOption.isSynchronous = true 
     requestOption.deliveryMode = .highQualityFormat 

     let fetchOptions = PHFetchOptions() 
     fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: true)] 

     let fetchResult : PHFetchResult = PHAsset.fetchAssets(with: .image, options: nil) 

      if(fetchResult.count > 0) { 
       for i in 0..<fetchResult.count { 
        imgManager.requestImage(for: fetchResult.object(at: i) , targetSize: CGSize.init(width: 105, height: 105), contentMode: .aspectFill, options: requestOption, resultHandler: {(image, error) in 
         self.imageArray.append(image!) 
        }) 
       } 
       print(imageArray.count) 
       print("Second : \(imageArray[0])") 
      } else { 
       ColView.reloadData() 
      } 


    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     //isvalom pazymetas nuotraukas. 
     selectedImages.removeAll() 

     // Uncomment the following line to preserve selection between presentations 
     // self.clearsSelectionOnViewWillAppear = false 

     // Register cell classei 
     let nib = UINib(nibName: "Cell", bundle: nil) 
     ColView.register(nib, forCellWithReuseIdentifier: reuseIdentifier) 
      grabPhotos() 

     ColView.allowsMultipleSelection = true 
     ColView.allowsSelection = true 


    } 
    @IBAction func IkeltiNuotraukas(_ sender: Any) { 
     let vc = AddAdvertise() 
     vc.NuotraukuKiekis(pazymetuNuotraukuKiekis: selectedImages) 
     self.view.removeFromSuperview() 
    } 
    //Paspaudus mygtuka, siunciam pazymetas nuotraukas atgal i AddAdvertise controleri 
    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 

     func numberOfSections(in collectionView: UICollectionView) -> Int { 
     // #warning Incomplete implementation, return the number of sections 
     return 1 
    } 

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

    public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { 
     let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) 
      as! Cell 
     cell.PlaceHolder.image = imageArray[indexPath.row] 
     cell.backgroundColor = UIColor.black 
     return cell 
    } 

    // MARK: UICollectionViewDelegate 

    /* 
    // Uncomment this method to specify if the specified item should be highlighted during tracking 
    override func collectionView(_ collectionView: UICollectionView, shouldHighlightItemAt indexPath: IndexPath) -> Bool { 
     return true 
    } 
    */ 

    public func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { 
     let cell = collectionView.cellForItem(at: indexPath) as! Cell 
     if(selectedImages.count < 6){ 
      cell.OK.isHidden = false 
      selectedImages.append(imageArray[indexPath.row]) 
      print(selectedImages.count) 
     } 
    } 
    public func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) { 
     let cell = collectionView.cellForItem(at: indexPath) as! Cell 
     cell.OK.isHidden = true 
     let selectedImage = cell.PlaceHolder.image 
     if(selectedImages.contains(selectedImage!)){ 
      selectedImages.remove(at: selectedImages.index(of: selectedImage!)!) 
     } 


    } 
    // Uncomment this method to specify if the specified item should be selected 
    public func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool { 
     return true 
    } 



    // Uncomment these methods to specify if an action menu should be displayed for the specified item, and react to actions performed on the item 
    public func collectionView(_ collectionView: UICollectionView, shouldShowMenuForItemAt indexPath: IndexPath) -> Bool { 
     return false 
    } 

    public func collectionView(_ collectionView: UICollectionView, canPerformAction action: Selector, forItemAt indexPath: IndexPath, withSender sender: Any?) -> Bool { 
     return false 
    } 

    public func collectionView(_ collectionView: UICollectionView, performAction action: Selector, forItemAt indexPath: IndexPath, withSender sender: Any?) { 
    print("Clicked") 
    } 
} 

When i call this function from button in Popover: 

    @IBAction func IkeltiNuotraukas(_ sender: Any) { 
    let vc = AddAdvertise() 
    vc.NuotraukuKiekis(pazymetuNuotraukuKiekis: selectedImages) 
    self.view.removeFromSuperview() 
} 

그것은 AddAdvertise 이미지 뷰에 이미지를 전달하는 가정이

여기 내 AddAdvertise.swift입니다.

Answer 1

오류가 발생한 위치를 격리하고 거기에서 시작해야합니다. func getImage (url : NSURL) -> UIImage? 이 경우 상황에서 {

var image : UIImage? 

if let path = url.path { 
    if NSFileManager.defaultManager().fileExistsAtPath(path) { 
     if let newImage = UIImage(contentsOfFile: path) { 
      image = newImage 
     } else { 
      print("getImage() [Warning: file exists at \(path) :: Unable to create image]") 
     } 

    } else { 
     print("getImage() [Warning: file does not exist at \(path)]") 
    } 
} 

return image 

}

Answer 2

은 컨트롤러간에 데이터를 전송하는 대표 또는 알림을 사용합니다.