使用 FileManager 复制文件时出错(CFURLCopyResourcePropertyForKey 失败,因为它传递了一个没有方案的 URL)

Error copying files with FileManager (CFURLCopyResourcePropertyForKey failed because it was passed an URL which has no scheme)

我正在尝试使用 FileManagercopyItem(at:path:) 将一些(媒体)文件从一个文件夹复制到另一个文件夹,但出现错误:

CFURLCopyResourcePropertyForKey failed because it was passed an URL which has no scheme Error Domain=NSCocoaErrorDomain Code=262 "The file couldn’t be opened because the specified URL type isn’t supported."

我正在使用 Xcode 9 beta 和 Swift 4.

let fileManager = FileManager.default
let allowedMediaFiles = ["mp4", "avi"]

func isMediaFile(_ file: URL) -> Bool {
    return allowedMediaFiles.contains(file.pathExtension)
}

func getMediaFiles(from folder: URL) -> [URL] {
    guard let enumerator = fileManager.enumerator(at: folder, includingPropertiesForKeys: []) else { return [] }

    return enumerator.allObjects
        .flatMap {[=11=] as? URL}
        .filter { [=11=].lastPathComponent.first != "." && isMediaFile([=11=])   
    }
}

func move(files: [URL], to location: URL) {
    do {
        for fileURL in files {
            try fileManager.copyItem(at: fileURL, to: location)
        }
    } catch (let error) {
        print(error)
    }
}


let mediaFilesURL = URL(string: "/Users/xxx/Desktop/Media/")!
let moveToFolder = URL(string: "/Users/xxx/Desktop/NewFolder/")!

let mediaFiles = getMediaFiles(from: mediaFilesURL)

move(files: mediaFiles, to: moveToFolder)

错误发生是因为

URL(string: "/Users/xxx/Desktop/Media/")!

创建一个没有方案的 URL。您可以使用

URL(string: "file:///Users/xxx/Desktop/Media/")!

或者,更简单地说,

URL(fileURLWithPath: "/Users/xxx/Desktop/Media/")

另请注意,在 fileManager.copyItem() 中,目的地必须 包括文件名,而不仅仅是目的地 目录:

try fileManager.copyItem(at: fileURL,
                    to: location.appendingPathComponent(fileURL.lastPathComponent))