Swift:无法将文件复制到新创建的文件夹

Question

我正在用 Swift 构建一个简单的程序，它应该将具有特定扩展名的文件复制到不同的文件夹。如果该文件夹存在，程序将只复制它们到文件夹中，如果该文件夹不存在，程序必须先创建它。

let newMTSFolder = folderPath.stringByAppendingPathComponent("MTS Files")

if (!fileManager.fileExistsAtPath(newMTSFolder)) {
    fileManager.createDirectoryAtPath(newMTSFolder, withIntermediateDirectories: false, attributes: nil, error: nil)
}

while let element = enumerator.nextObject() as? String {
    if element.hasSuffix("MTS") { // checks the extension
        var fullElementPath = folderPath.stringByAppendingPathComponent(element)

        println("copy \(fullElementPath) to \(newMTSFolder)")

        var err: NSError?
        if NSFileManager.defaultManager().copyItemAtPath(fullElementPath, toPath: newMTSFolder, error: &err) {
            println("\(fullElementPath) file added to the folder.")
        } else {
            println("FAILED to add \(fullElementPath) to the folder.")
        }
    }
}

运行此代码将正确识别 MTS 文件，但随后会导致“添加失败...”，我做错了什么？

Answer 1

来自copyItemAtPath(...) documentation :

dstPath
The path at which to place the copy of srcPath. This path must include the name of the file or directory in its new location. ...

您必须将文件名附加到目标目录中 copyItemAtPath() 调用(针对 Swift 3 及更高版本更新了代码)

let srcURL = URL(fileURLWithPath: fullElementPath)
let destURL = URL(fileURLWithPath: newMTSFolder).appendingPathComponent(srcURL.lastPathComponent)

do {
    try FileManager.default.copyItem(at: srcURL, to: destURL)
} catch {
    print("copy failed:", error.localizedDescription)
}