showNextMonth not respond to delegate method

[JordanMontel]

Edit :
I'm confused, I use a fork of your project on cocoapod available here :
https://github.com/KiranPanesar/VRGCalendarView

So, the problem is on the fork project. Sorry

You don't update your method of delegate in your call :
if ([delegate respondsToSelector:@selector(calendarView:switchedToMonth:targetHeight: animated:)])

It should be :
if ([delegate respondsToSelector:@selector(calendarView:switchedToMonth:year:numOfDays:targetHeight:animated:)])

Thanks for your work