Set the RangeCalendarViewController instead of SimpleCalender

[RB-King]

Hello,
I know this is good demo and good example code. But in my issue,
In My ios App that developed By Other Developer and set the SimpleCalender.
But Now i want to set the RangeCalendar instead of the SimpleCalender.
But, I don't know how to do this...
Other Developer Code is Like,

DatePickerViewController.h file,

@interface DatePickerViewController : PDTSimpleCalendarViewController{
}
DatePickerViewController is simple view controller.

And in DatePickerViewController.m File,

• (void)viewDidLoad {
  [super viewDidLoad];

  [self setDelegate:self];
  self.weekdayHeaderEnabled = YES;
  self.weekdayTextType = PDTSimpleCalendarViewWeekdayTextTypeShort;
  [[PDTSimpleCalendarViewCell appearance] setCircleSelectedColor:[UIColor defaultColor]];
  [[PDTSimpleCalendarViewHeader appearance] setTextColor:[UIColor defaultColor]];
  }
  So, Please Guide me and Help me where i set and where i change in code For set RangeCalendar ?

Thank s in advance.
@archfear @craigmcc @tirsen @tewha @philvarner