Swift:无法将文件复制到新创建的文件夹 [英] Swift: failing to copy files to a newly created folder

问题描述

我正在 Swift 中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.如果这个文件夹存在，程序就将它们复制到文件夹中，如果文件夹不存在，程序必须先制作.

I'm building a simple program in Swift, it should copy files with a certain extension to a different folder. If this folder exist the program will just copy them in the folder, if the folder doesn't exist, the program has to make it first.

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，但会导致添加失败..."，我做错了什么?

Running this code will correctly identify the MTS files but then result in a "FAILED to add...", what am I doing wrong?

推荐答案

来自 copyItemAtPath(...) 文档:

From the copyItemAtPath(...) documentation:

dstPath
放置 srcPath 副本的路径.这条路必须在新位置包含文件或目录的名称....

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)

You have to append the file name to the destination directory for the copyItemAtPath() call (code updated for Swift 3 and later)

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)
}

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