CloudKit modifySubscriptionCompletionBlock

Question

我尝试使用CloudKitOperations进行订阅，但得到以下错误：

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我做错了什么？

let subscriptionOperation = CKModifySubscriptionsOperation(subscriptionsToSave: subscriptionsToUpload, subscriptionIDsToDelete: nil)
    subscriptionOperation.database = _publicDB

    subscriptionOperation.modifySubscriptionsCompletionBlock { (modifiedSubscriptions: [CKSubscription]?, deletedSubscriptionIDs: [String]?, error: NSError?) -> Void in
        guard operationError==nil else {
            // handle Error
            print(err.localizedDescription)
            dispatch_async(dispatch_get_main_queue(), { () -> Void in
                let title:String = "Alert_CloudKit_Subscription_Error_Title".localized
                let message:String = err.localizedDescription
                self._animationDelegate?.endAnimation()
                self._alertDelegate?.showAlert(title, message: message)
                NSNotificationCenter.defaultCenter().postNotificationName("switchSubscribeToNewRecordOff", object: nil)
            })
            return
        }

        dispatch_async(dispatch_get_main_queue(), { () -> Void in
            print("CloudKit subscription success")

            let title:String = "Alert_CloudKit_Subscription_Success_Title".localized
            let message:String = "Alert_CloudKit_Subscription_Success_Messagen".localized + " \(predicate)"
            self._animationDelegate?.endAnimation()
            self._alertDelegate?.showAlert(title, message: message)
        })
    }

Answer 1

Swift 3想要错误？不是NSError？作为类型。

subscriptionOperation.modifySubscriptionsCompletionBlock =  {(modifiedSubscriptions: [CKSubscription]?, deletedSubscriptionIDs: [String]?, saveError: Error?) -> Void in