按 ID 查找消息

OIMFindMessageListParam *query = [OIMFindMessageListParam new];
query.conversationID = conversationID;
query.clientMsgIDList = @[clientMsgID];

[[OIMManager manager] findMessageList:@[query]
    onSuccess:^(OIMSearchResultInfo * _Nullable result) {
        OIMSearchResultItemInfo *item = result.findResultItems.firstObject;
        OIMMessageInfo *message = item.messageList.firstObject;
        if (message != nil) {
            [self openMessage:message conversationID:item.conversationID];
        }
    }
    onFailure:^(NSInteger code, NSString * _Nullable msg) {
        // 处理查询失败
    }];