UIImage（名前：文字列）は割り当てられていません

Question

Swift 3ではUIImageView(named: string_of_image)が割り当てられていません。他の同様の質問は画像を格納するためにimage.xcassetsを使用していますが、私はAssets.xcassetsを使用しています。たぶんそれはいくつかのエラーを引き起こしたが、私はそれが主要な問題ではないとは思わない。ここに私のコードは次のとおりです。

contentViewController.swift

import UIKit 
class ContentViewController: UIViewController { 
    @IBOutlet weak var guideImage: UIImageView! 

    var pageIndex:Int! 
    var imageFile: String = "" { 
     didSet { 
      if let imageView = guideImage { 
       imageView.image = UIImage(named: imageFile) 
      } 

     } 
    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     print(imageFile) 
     if let image = UIImage(named: imageFile) { 
      guideImage.image = image 

     } 
     else { 
      print("image not assigned") 
     } 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 


    /* 
    // MARK: - Navigation 

    // In a storyboard-based application, you will often want to do a little preparation before navigation 
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
     // Get the new view controller using segue.destinationViewController. 
     // Pass the selected object to the new view controller. 
    } 
    */ 

} 

GuideViewController.swift

import UIKit 

class GuideViewController: UIViewController, UIPageViewControllerDataSource { 
    var PageViewController: UIPageViewController! 
    var PageImage: Array<String>! 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     self.PageImage = ["페이지1", "페이지2", "페이지3"] 


     let pageController = self.storyboard!.instantiateViewController(withIdentifier: 일반사용자가이드컨트롤러) as! UIPageViewController 
     pageController.dataSource = self 

     if PageImage.count > 0 { 
      let firstController = viewControllerAtIndex(index: 0) 
      let startingViewControllers = [firstController] 
      pageController.setViewControllers(startingViewControllers, direction: UIPageViewControllerNavigationDirection.forward, animated: false, completion: nil) 
     } 

     self.PageViewController = pageController 
     addChildViewController(self.PageViewController!) 
     self.view.addSubview(self.PageViewController!.view) 
     self.PageViewController!.didMove(toParentViewController:self) 


     let appearance = UIPageControl.appearance() 
     appearance.pageIndicatorTintColor = UIColor.gray 
     appearance.currentPageIndicatorTintColor = UIColor.white 
     appearance.backgroundColor = UIColor.darkGray 


    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 


    private func viewControllerAtIndex (index : Int) -> ContentViewController { 

     let vc : ContentViewController = self.storyboard?.instantiateViewController(withIdentifier: 페이지컨텐츠뷰) as! ContentViewController 

     vc.pageIndex = index 
     vc.imageFile = self.PageImage[index] as String 

     return vc 
    } 

    /** 
    * 이전 ViewPageController 구성 
    */ 
    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? { 

     let vc = viewController as! ContentViewController 
     var index = vc.pageIndex as Int 

     if(index == 0 || index == NSNotFound) { 
      return nil 
     } 

     index = index-1 

     vc.guideImage.image = UIImage(named: self.PageImage[index]) 
     return self.viewControllerAtIndex(index: index) 
    } 


    /** 
    * 이후 ViewPageController 구성 
    */ 
    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? { 

     let vc = viewController as! ContentViewController 

     var index = vc.pageIndex as Int 

     if(index == NSNotFound) { 
      return nil 
     } 

     index += 1 

     if (index == self.PageImage.count) { 
      return nil 
     } 

     vc.guideImage.image = UIImage(named: self.PageImage[index]) 

     return self.viewControllerAtIndex(index:index) 
    } 


    /** 
    * 인디케이터의 총 갯수 
    */ 
    func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int { 
     return self.PageImage.count 
    } 


    /** 
    * 인디케이터의 시작 포지션 
    */ 
    func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int { 
     return 0 
    } 


    /* 
    // MARK: - Navigation 

    // In a storyboard-based application, you will often want to do a little preparation before navigation 
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
     // Get the new view controller using segue.destinationViewController. 
     // Pass the selected object to the new view controller. 
    } 
    */ 

} 

詳細な情報が必要な場合、私に知らせてください。 UIImageで

（解決） （命名：StringOfFile）、StringOfFileは英語でなければなりません...それはあなたのファイルの拡張子を追加し、このような

Answer 1

とのトラブルを持って誰かに役に立つかもしれません。例： ["ページ1.png"、 "ページ2.jpg"、 "ページ3.gif"]