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我有以下删除文件的功能（恰好是 iCloud）。有时它有效，有时它挂在 filecoordinate.coordinate 行：

func deleteDocumentAtURL(url: NSURL) {

    print("IN DELETE: existing url: \(url)")
    print("IN DELETE: openable: \(itemIsOpenable(url as URL))")

    let fileCoordinator = NSFileCoordinator(filePresenter: nil)
    print("IN DELETE: attempting file coordinator, might get STUCK here")
    print("IN DELETE: file coordinator = \(fileCoordinator)")

    var fileError: NSError?        

    fileCoordinator.coordinate(writingItemAt: url as URL, options: .forDeleting, error: &fileError, byAccessor: { (urlForModifying) -> Void in

        print("IN DELETE: modifying URL: \(urlForModifying)")

        do {
            print("IN DELETE deleteDocumentBlock")
            try FileManager.default.removeItem(at: urlForModifying)

            print("IN DELETE: deletion OK")

        } catch let error as NSError {
            let alert = UIAlertController(title: "Error deleting", message: error.localizedDescription, preferredStyle: UIAlertControllerStyle.alert)

            alert.addAction(UIAlertAction(title: "Done", style: .default, handler: nil))

            self.present(alert, animated: true, completion: nil)
        }
    })
    print("Error code = \(fileError)")
    print("IN DELETE: at the end")
}

itemIsOpenable 函数检查 iCloud 下载状态如下：

func itemIsOpenable(_ url:URL?) -> Bool {

    // Return false if item is nil
    guard let itemURL = url else {
        return false
    }

    // Return true if we don't have access to iCloud (which means
    // that it's not possible for it to be in conflict - we'll always have
    // the latest copy)
    if DocumentListViewController.iCloudAvailable == false {
        return true
    }

    // Ask the system for the download status
    var downloadStatus : AnyObject?
    do {
        try (itemURL as NSURL).getResourceValue(&downloadStatus,
                                                forKey: URLResourceKey.ubiquitousItemDownloadingStatusKey)
    } catch let error as NSError {
        NSLog("Failed to get downloading status for \(itemURL): \(error)")
        // If we can't get that, we can't open it
        return false
    }

    print("item is openable download status = \(downloadStatus)")

    // Return true if this file is the most current version

    if downloadStatus as? String == URLUbiquitousItemDownloadingStatus.current.rawValue {
        print("download status = \(downloadStatus)")

        return true
    } else {
        let currentStatus = downloadStatus as? String
        print("current status = \(currentStatus)")
        print("Ubiq status = \(URLUbiquitousItemDownloadingStatus.current.rawValue)")
        return false
    }
}

应用挂起时的打印输出如下（不再赘述）：

在删除：现有网址：file:///private/var/mobile/Library/Mobile%20Documents/iCloud~net~thesavorys~Notes/Documents/Document%201997293854.note

项目是可打开的下载状态=可选（NSURLUbiquitousItemDownloadingStatusCurrent）下载状态=可选（NSURLUbiquitousItemDownloadingStatusCurrent）IN DELETE：openable：true IN DELETE：尝试文件协调器，可能会卡在这里IN DELETE：文件协调器= NSFileCoordinator：0x17046de40

任何关于这里发生的事情的想法都非常感谢......

谢谢蒂姆

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