headerTitleFont appearance doesn't seem to be working

[wilkinnh]

I set this by doing the following, but it doesn't seem to change the header font at all.

calendar.scrollDirection = FSCalendarScrollDirectionVertical;
calendar.placeholderType = FSCalendarPlaceholderTypeFillHeadTail;
calendar.pagingEnabled = NO;
calendar.allowsMultipleSelection = YES;
calendar.firstWeekday = 2;
calendar.appearance.headerTitleFont = [UIFont systemFontOfSize:10 weight:UIFontWeightRegular];

[WenchaoD]

[wilkinnh]

Thank you!! I was looking at CocoaDocs and when I hovered over this property it didn't include that warning, so I never saw it. Appreciate the quick response!