Did IP Man really fight with foreigners?

In Ip Man, IP Man was challenged by northern martial artists and fought with the Japanese. These two key plots fully reflect Ye Wen's superb martial arts attainments. Is there such a "god" in IP Man's history? Director Ye Weixin said that as a film, IP Man must have fictional elements, but these two plots are true. Among them, the plot of IP Man's contest with the Japanese comes from such a period of history-a Japanese asked IP Man to teach Kung Fu, but IP Man refused. Later, they had a fight. Of course, Ip Man won. These materials are still preserved in Foshan.