我在尝试使用NSFileCoordinator的coordinateWritingItemAtURL()方法时遇到“额外参数”错误

Question

错误是:调用中有额外的参数'writingItemAtURL‘

我正在为iOS开发Swift

我在Yosemite上使用Xcode 6.1.1

我尝试删除DerivedData并重启xcode，但没有任何帮助。

下面是一些游乐场代码来说明这个问题：

let movingOption = NSFileCoordinatorWritingOptions.ForMoving
let replacingOption = NSFileCoordinatorWritingOptions.ForReplacing
var testURL1 = NSURL(fileURLWithPath: "file1")
var testURL2 = NSURL(fileURLWithPath: "file2")
var error1: NSErrorPointer?
var error2: NSErrorPointer?
let fc = NSFileCoordinator(filePresenter: nil)
var result = false

fc.coordinateWritingItemAtURL(testURL1, options: movingOption, writingItemAtURL: testURL2, options: replacingOption, error: &error1, byAccessor: { (newURL1: NSURL, newURL2: NSURL) in
    let fm = NSFileManager.defaultManager()
    result = fm.moveItemAtURL(newURL1, toURL: newURL2, error: error2)
    if !result {
        println("DEBUG: Failed to move file \(moveError?.localizedDescription)")
    }
})

Answer 1

将最后一行替换为：

fc.coordinateWritingItemAtURL(testURL1, options: movingOption, writingItemAtURL: testURL2, options: replacingOption, error: &error1) { (newURL1: NSURL, newURL2: NSURL) -> Void in
    let fm = NSFileManager.defaultManager()
    result = fm.moveItemAtURL(newURL1, toURL: newURL2, error: error2)
    if !result {
        println("DEBUG: Failed to move file \(moveError?.localizedDescription)")

    }
}

Answer 2

我发现我犯了个愚蠢的错误。参数列表中的URL需要解包，因此工作代码如下所示：

let movingOption = NSFileCoordinatorWritingOptions.ForMoving
let replacingOption = NSFileCoordinatorWritingOptions.ForReplacing
var testURL1 = NSURL(fileURLWithPath: "file1")!
var testURL2 = NSURL(fileURLWithPath: "file2")!
var error1: NSError?
var error2: NSError?
let fc = NSFileCoordinator(filePresenter: nil)
var result = false

fc.coordinateWritingItemAtURL(testURL1, options: movingOption, writingItemAtURL: testURL2, options: replacingOption, error: &error1, byAccessor: { (newURL1: NSURL!, newURL2: NSURL!) in
    let fm = NSFileManager.defaultManager()
    result = fm.moveItemAtURL(newURL1, toURL: newURL2, error: &error2)
    if !result {
        println("DEBUG: Failed to move file \(error2?.localizedDescription)")
    }
})