CupertinoPicker in Flutter

CupertinoPicker is a widget that provides an optional rotation wheel and is commonly used on iOS devices.
Allows the user to select one option from a list of choices

There Are Some Common Attributes for CupertinoPicker

Here's a simple example of using a CupertinoPicker in Flutter:

File open lib->main.dart file −

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(
    MyApp()
  );
}
class MyApp extends StatefulWidget{

  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
   int _selectedIndex = 0;
  // List of items for the dropdown
  List<String> _items = ['Flutter', 'Java', 'Kotlin', 'JetPack'];
  @override
  Widget build(BuildContext context) {
    return   MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          backgroundColor: Colors.blue,
          title: Text('CupertinoPicker Example',
              style:TextStyle(fontSize: 20,color: Colors.white)),
        ),
        body:
        Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [

              SizedBox(
                height: 200,
                child: CupertinoPicker(
                  itemExtent: 60, // Height of each item
                  onSelectedItemChanged: (index) {
                    setState(() {
                      _selectedIndex = index;
                    });
                  },
                  children: _items.map((String item) {
                    return Center(
                      child: Text(item),
                    );
                  }).toList(),
                ),
              ),
              SizedBox(height: 20),
              Text('Selected Item : ${_items[_selectedIndex]}'),
            ],
          ),
        )

    ));

  }
}

Open Device Manager, run the emulator, and then run the application. Next, check the working output and check the output you declared in your code.

Output: