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我正在使用CKOperation以下内容通过他们的电子邮件查找用户记录。每次我运行代码时，它总是将用户的发现返回为零。我知道电子邮件地址是正确的。你知道我哪里可能出错或者 CloudKit 是否有错误？

谢谢

let operation = CKDiscoverUserInfosOperation()

        operation.qualityOfService = .UserInitiated
        operation.emailAddresses = ["email@me.com"]

        operation.discoverUserInfosCompletionBlock = { [unowned self] (userInfoString, userInfoID, error) in
            if error != nil {
                dispatch_async(dispatch_get_main_queue()) {
                    //Update UI Here
                    let alert = UIAlertView(title: "Error", message: "Unable to fetch data. Please try again later.", delegate: self, cancelButtonTitle: "Okay").show()
                }
            } else {
                print("Info string: \(userInfoString)")
                print("Info: \(userInfoID)")
            }
        }

        container.addOperation(operation)

我还在以下内容中添加了这个viewDidLoad：

CKContainer.defaultContainer().requestApplicationPermission(CKApplicationPermissions.UserDiscoverability,
                                                                completionHandler: {
                                                                    applicationPermissionStatus, error in
    })
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