按 ID 查找消息

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

[[OIMManager manager] findMessageList:@[query]
    onSuccess:^(OIMSearchResultInfo *result) {
        OIMSearchResultItemInfo *item = result.findResultItems.firstObject;
        OIMMessageInfo *message = item.messageList.firstObject;
        if (message != nil) [self openMessage:message conversationID:item.conversationID];
    }
    onFailure:nil];