cupertino_segmented_control_sample.dart

final Map<int, Widget> children = <int, Widget>{
        0: Text('Basic'),
        1: Text('Advanced'),
  };
      
CupertinoSegmentedControl<int>(
       children: children,
       onValueChanged: (int newValue) {
            setState(() {
            sharedValue = newValue;
           });
         },
   groupValue: sharedValue,
   )