CloudKit：如何使用 CKFetchShareParticipants 和 CKModifyRecords 获取共享 URL？

如何解决CloudKit：如何使用 CKFetchShareParticipants 和 CKModifyRecords 获取共享 URL？

我正在关注此 WWDC video 和一些在线找到的示例代码（遗憾的是 Apple 没有在其 WWDC 演讲中包含示例代码），使用下面的此代码，我的 ckshareParticipant 没问题，但是这块 modoperation.modifyRecordsCompletionBlock 根本没有返回，我做错了什么？

 private func share(record: CKRecord) {
        
        let share = ckshare(rootRecord: record)
        // save
        let operation = CKFetchShareParticipantsOperation(userIdentityLookupInfos: [CKUserIdentity.LookupInfo(emailAddress: "friendsEmail@gmail.com")])
        
        var participants = [ckshare.Participant]()
        
        // Collect the participants as CloudKit generates them.
        operation.shareParticipantFetchedBlock = { participant in
           
            participants.append(participant)
        }
        
        // If the operation fails,return the error to the caller.
        // Otherwise,return the array of participants.
        operation.fetchShareParticipantsCompletionBlock = { error in
            
            if let error = error {
                print("error: ",error)
            } else {
            
                for participant in participants {
                    print("we have a participant! = \(participant)")
                    
                    let modoperation: CKModifyRecordsOperation = CKModifyRecordsOperation(recordsToSave: [record,share],recordIDsToDelete: nil)
                    
                    operation.shareParticipantFetchedBlock = { participant in
                        participant.permission = .readOnly
                        share.addParticipant(participant)
                        
                        modoperation.savePolicy = .ifServerRecordUnchanged
                        
                        //nothing in this block gets called
                        modoperation.modifyRecordsCompletionBlock = {records,recordIDs,error in
                            if let error = error {
                                print("error in modifying the records: ",error)
                            } else {
                                print("TESTING records = \(records) recordIDs = \(recordIDs)")
                            }
                            
                        }
                    }
                
                    modoperation.qualityOfService = .userInitiated
                    container.privateCloudDatabase.add(modoperation)
                    
                    
                }   //end of for participant in participants
            }
            
            
            
        } //end of operation.fetchShareParticipantsCompletionBlock
        
        // Set an appropriate QoS and add the operation to the
        // container's queue to execute it.
        operation.qualityOfService = .userInitiated
        container.add(operation) //It was important to make sure this is the same container
    }

解决方法

这最终只是一个错字，我只需要删除 operation.shareParticipantFetchedBlock = { participant in声明下的这一行modOperation