createState method

@override State<StatefulWidget> createState()

Creates the mutable state for this widget at a given location in the tree.

Subclasses should override this method to return a newly created instance of their associated State subclass:

@override
State<SomeWidget> createState() => _SomeWidgetState();

The framework can call this method multiple times over the lifetime of a StatefulWidget. For example, if the widget is inserted into the tree in multiple locations, the framework will create a separate State object for each location. Similarly, if the widget is removed from the tree and later inserted into the tree again, the framework will call createState again to create a fresh State object, simplifying the lifecycle of State objects.

Implementation

@override
State<StatefulWidget> createState() {
  // The `time` mode and `dateAndTime` mode of the picker share the time
  // columns, so they are placed together to one state.
  // The `date` mode has different children and is implemented in a different
  // state.
  switch (mode) {
    case PCupertinoDatePickerMode.time:
    case PCupertinoDatePickerMode.dateAndTime:
      return _CupertinoDatePickerDateTimeState();
    case PCupertinoDatePickerMode.date:
      return _CupertinoDatePickerDateState();
  }

  assert(false);
  return _CupertinoDatePickerDateTimeState();
}