Xcode 9.2 UIDocumentBrowserViewController : Failed to create a url from bookmarkableString

问题

Update: Xcode 9.3 has fixed it.

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When creating UIDocument File in UIDocumentBrowserViewController

[default] [ERROR] Could not resolve bookmark. 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.}

[DocumentManager] Failed to create a url from bookmarkableString (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.})

Code work well in Xcode 9.1, But Failed in Xcode 9.2. almost the same code as wwdc 2017.

func documentBrowser(_ controller: UIDocumentBrowserViewController, didRequestDocumentCreationWithHandler importHandler: @escaping (URL?, UIDocumentBrowserViewController.ImportMode) -> Void) {
    let newDocumentURL: URL? = R.file.templateDocument()

    // Set the URL for the new document here. Optionally, you can present a template chooser before calling the importHandler.
    // Make sure the importHandler is always called, even if the user cancels the creation request.

    if newDocumentURL != nil {
        importHandler(newDocumentURL, .copy)
    } else {
        importHandler(nil, .none)
    }
}

来源：https://stackoverflow.com/questions/47658935/xcode-9-2-uidocumentbrowserviewcontroller-failed-to-create-a-url-from-bookmark