What I was trying is set font size and font family separately due to some reasons.
For setting size I used
[addressLabel setFont:[UIFont systemFontOfSize:12.0]];
However for family name I am not finding how to do that.. Any idea how to get that?
You need more than just the font family, you need the font name. Once you have a font name, if you want to update the label's font to the new font with the same size, you can do:
UIFont *oldFont = addressLabel.font
UIFont *newFont = [UIFont fontWithName:someName size:oldFont.pointSize];
addressLabel.font = newFont;