CupertinoCalendarMonthViewExternalController constructor Null safety

CupertinoCalendarMonthViewExternalController(GlobalKey<CupertinoCalendarMonthViewState> stateKey)

Initalize controller with stateKey

stateKey must be attached to CupertinoCalendarMonthView already

Implementation

CupertinoCalendarMonthViewExternalController(
    GlobalKey<CupertinoCalendarMonthViewState> stateKey)
    : _stateKey = stateKey;