将之前聊天记录（用环信之前）插入DB

        [httpTool GET:url withParameters:parameter success:^(NSDictionary *data) {

            //[weakSelf insertConversationAndMessage:data];

            

            NSArray *allKeys = [data allKeys];

            

            for (int i = 0 ; i < allKeys.count; i++) {

                NSString *conversationID = allKeys[i];

                //创建conversation实例

                EMConversation * insertConverstaion = [[EMClient sharedClient].chatManager getConversation:conversationID type:EMConversationTypeChat createIfNotExist:YES];

                insertConverstaion.ext = nil;

                //[weakSelf.insertConverstationArray addObject:insertConverstaion];

                NSArray *messageArray = [data objectForKey:conversationID];

           

              for (int j = 0; j < messageArray.count; j++) {

                    

                    NSMutableDictionary *messageDic = messageArray[j];

//

                    EMTextMessageBody *body = [[EMTextMessageBody alloc] initWithText:messageDic[@"text"]];

                    EMMessage *message = [[EMMessage alloc] initWithConversationID:conversationID from:messageDic[@"from"] to:messageDic[@"to"] body:body ext:nil];

                    message.isRead = YES;

                    message.timestamp = [messageDic[@"timestamp"] longLongValue];

                    message.messageId = [NSString stringWithFormat:@"HistoryMessage%@__%d",conversationID,j];

                    message.chatType = EMChatToolbarTypeChat;

                    message.isDeliverAcked = YES;

                    message.isReadAcked = YES;

                    message.status = EMMessageStatusSuccessed;

                    message.direction = [messageDic[@"direction"] boolValue] == YES ? EMMessageDirectionSend: EMMessageDirectionReceive;

                    //[insertConverstaion insertMessage:message];

                  [weakSelf.insertConverstationArray addObject:message];

                

                }

            }

            [[EMClient sharedClient].chatManager importMessages:weakSelf.insertConverstationArray];

            

            //[[EMClient sharedClient].chatManager importConversations:weakSelf.insertConverstationArray];

        

            

            //如果成功调用这个方法

            if (weakSelf.delegate && [weakSelf.delegate respondsToSelector:@selector(getAllHistoryMessagesFromFTServicerFinish:)]) {

                [weakSelf.delegate getAllHistoryMessagesFromFTServicerFinish:weakSelf];

            }



            [[NSUserDefaults standardUserDefaults] setObject:@"Done" forKey:FTHistoryMessageDownloadFromServicer];

            [[NSUserDefaults standardUserDefaults] synchronize];

//

        } failure:^(NSError *error, AFHTTPRequestOperation *operation) {

            //如果失败调用这个方法

            if (weakSelf.delegate && [weakSelf.delegate respondsToSelector:@selector(getAllHistoryMessagesFromFTServicerFail:)]) {

                [weakSelf.delegate getAllHistoryMessagesFromFTServicerFail:weakSelf];

            }

            

        }];

[EMassageModel ratain] message sent to delloced instance.