iOS 11上的UIDocument创建：不允许读者访问该URL [英] UIDocument Creation on iOS 11: reader is not permitted to access the URL

问题描述

自iOS 11以来，我每次使用 UIDocument API时遇到以下错误每次创建新文档：

Since iOS 11 I have encountered the following error every time I am creating a new document using UIDocument API:

[错误]无法获取项目 / var / mobile / Containers / Data / Application / XXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXX /的属性值Documents / myDoc-XXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXX.myFile（n）。

错误：错误域= NSFileProviderInternalErrorDomain Code = 1

不允许读者访问该URL。

UserInfo = {NSLocalizedDescription =不允许读者访问该URL。}

Error: Error Domain=NSFileProviderInternalErrorDomain Code=1
"The reader is not permitted to access the URL."
UserInfo={NSLocalizedDescription=The reader is not permitted to access the URL.}

与类似问题（ 1 不同， 2 ， 3 ）在SO上，我没有使用 UIDocumentBrowserViewController 。我只是创建一个UIDocument并自己调用 save（）到 Documents 目录。我找到的最接近的问题使用 UIManagedDocument 。但是，就我而言，尽管出现错误消息，仍然会成功创建并写入文件。

Unlike similar questions (1, 2, 3) on SO on this, I am not using UIDocumentBrowserViewController. I am simply creating a UIDocument and call save() to the Documents directory myself. The closest question I found uses UIManagedDocument. However, in my case, the file is still created and written successfully despite the error message.

以下是我的保存例程的要点：

Here's the gist of my save routine:

@IBAction func createDoc(_ sender: Any) {
    let uuid = UUID().uuidString
    let doc = Document(baseName: "myDoc-\(uuid)")
    doc.save(to: doc.fileURL, for: .forCreating) { (completed) in
        if (completed) {
            doc.close(completionHandler: nil)
            self.verifyNumberOfFiles()
        }
    }
}

为了简化这个问题，我的 UIDocument 子类也几乎为空：

My UIDocument subclass is also almost blank for simplicity of this question:

class Document: UIDocument {    

    let fileExtension = "myFile"

    override init(fileURL url: URL) {
        super.init(fileURL: url)
    }

    /// Convenience method for `init(fileURL:)`
    convenience init(baseName: String) {
        self.init(fileURL: documentsDirectory.appendingPathComponent(baseName).appendingPathExtension(Document.fileExtension))
    }

    override func contents(forType typeName: String) throws -> Any {
        return NSData()
    }

    override func load(fromContents contents: Any, ofType typeName: String?) throws {

    }

}

我总是写信给文件文件夹，我的查找例程可以验证我的文件是否已成功创建：

I'm always writing to Documents folder, and my lookup routine can verify that my files are successfully created:

public var documentsDirectory: URL {
    return FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).last!
}

func loadFileURLs(from dirURL: URL) -> [URL]? {
    return try? FileManager().contentsOfDirectory(at: dirURL, includingPropertiesForKeys: nil)
}

我是什么到目前为止已经发现：

What I have discovered so far:

• 即使我已经设置了UTI，也会出现错误。请参阅此和这个。


• 当我向我发送myFile时，我可以验证我的UTI是否有效设备通过AirDrop并正确触发我的应用程序打开。


• 该错误仅出现在iOS 11上。相同的代码不会在iOS 10上重现错误，例如上面的问题。


• 我尝试添加 UISupportsDocumentBrowser 键，虽然我没有使用浏览器，但它没有解散错误。

• The error appears even when I set up my UTI already. See this and this.
• I can verify that my UTI works when I send a "myFile" to my device over AirDrop and it correctly triggers my app to open.
• The error appears on iOS 11 only. The same code doesn't reproduce the error on iOS 10, like in the question above.
• I tried adding UISupportsDocumentBrowser key although I'm not using the browser but it's not dissolve the error.

发生了什么事？这只是iOS 11上的噪音错误消息吗？

What is happening? Is this just a "noise" error message on iOS 11?

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