swift3 – 在Swift 3中设置URL资源值

Apple(Swift 2)示例包含以下代码：

// Coordinate reading on the source path and wriTing on the desTination path to copy.
let readIntent = NSFileAccessIntent.readingIntentWithURL(templateURL,options: [])
let writeIntent = NSFileAccessIntent.wriTingIntentWithURL(target,options: .Forreplacing)

NSFileCoordinator().coordinateAccessWithIntents([readIntent,writeIntent],queue: self.coordinationQueuE) { error in
    if error != nil { return }
    do {
        try fileManager.copyItemAtURL(readIntent.URL,toURL: writeIntent.URL)    
        try writeIntent.URl.setresourceValue(true,forKey: NSURLHasHiddenExtensionKey)    
        NSOperationQueue.mainQueue().addoperationWithBlock {
            self.openDocumentAtURL(writeIntent.URL)
        }
    } catch {
        fatalError("Unexpected error during trivial file operations: \(error)")
    }
}

setresourceValue(value：forKey :)似乎已被setresourceValues()取代,但我无法设置它.到目前为止我所拥有的是：

let readIntent = NSFileAccessIntent.readingIntent(with: templateURL,options: [])
let writeIntent = NSFileAccessIntent.wriTingIntent(with: target,options: .forreplacing)

NSFileCoordinator().coordinate(with: [readIntent,queue: self.coordinationQueuE) { error in
    if error != nil { return }                
    do {
        try fileManager.copyItem(at: readIntent.url,to: writeIntent.url)
        var resourceValues: URLresourceValues = URLresourceValues.init()
        resourceValues.hasHiddenExtension = true
        // *** Error on next line ***
        try writeIntent.url.setresourceValues(resourceValues)
        // CAnnot use mutaTing member on immutable value: 'url' is a get-only property

        OperationQueue.main.addoperation {
            self.openDocumentAtURL(writeIntent.URL)
        }
    } catch {
        fatalError("Unexpected error during trivial file operations: \(error)")
    }      
}

除了Xcode“跳转到定义”之外,我找不到任何文档

有没有人对setresourceValue(s)的变化有任何了解？