Question

I have a mapview, with a title and a subtitle for my annotations which are NSString* and I’d like to know if there’s any way to change the font size.

Answer 1

On a String Object there is no way to edit font, you should try to use a UILabel. Look at this code:

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 200, 50)];
label.text = yourString; //You can also use @"string" instead of an NSString
label.textAlignment = UITextAlignmentCenter;
label.textColor = [UIColor whiteColor];
label.font = [UIFont fontWithName:@"Helvetica-Oblique" size:(12.0)]; //Font ;)
label.backgroundColor = [UIColor clearColor];

As you can see there is a property to set the font, fot a list of font look that site: http://iosfonts.com/