Having been held 3-3 by Celtic in the Champions League and well beaten by Tottenham before the international break, City are now three games without a win after starting the campaign with 10 on the trot.
Guardiola accepted his team were riding a tricky patch - not an ideal situation heading into a midweek Champions League assignment against his former side Barca.
But he has no intention of compromising his principles on the back of three winless matches.
"I'm sorry, never in my life am I going to change the way I want to play football," he said. "It's the only way I have. I can make mistakes, be judged for many things, but I have only one power: my teams play the way I want.
"There are storms, problems, but what is nice is to improve on that. We've improved a lot on what happened in Glasgow and Tottenham.
"We created enough chances to win the game, they had one chance. One situation. Sometimes football is beautiful for that reason and sometimes you play bad and win games."