在 swift 的子文件夹中找不到图像?

can not find image in subfolder in swift?

我正在构建一个非常简单的循环查看图片的应用程序。
所有图片都存储在项目的子文件夹中:

这是 ViewController 中的代码:

    @IBOutlet var imageView: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.

        var images = [UIImage]()

        let items = Bundle.main.paths(forResourcesOfType: "jpg", inDirectory: "images")
        for item in items {
            let fileName = URL(string: item)?.lastPathComponent ?? "c1.jpg"
            let image = UIImage(named: fileName)!
            images.append(image)
        }
        imageView.image = UIImage.animatedImage(with: images, duration: Double(5*items.count))
    }
}

这会在 let image = UIImage(named: fileName)!

行引发运行时错误

Fatal error: Unexpectedly found nil while unwrapping an Optional value: file

fileName 的值是 "c1.jpg",听起来不错。

如果我的记忆还在,同样的代码在模拟器上运行,但在真实设备上出现运行时错误,现在它在两个模拟器上都停止运行了。不确定哪里出了问题?我可以看到 "images" 文件夹列在 "Build Phases" 中,所以我认为应该将图像复制到包中?:

尝试

let image = UIImage(named:"images/\(fileName)")!

 let items = Bundle.main.urls(forResourcesWithExtension: "jpg", subdirectory: "images") ?? []

  for item in items {

       if let imageData = try? Data(contentsOf:item) {
           let image = UIImage(data:imageData)!
           images.append(image)
       }
   }