Flutter CupertinoButton – onPressed

Flutter CupertinoButton – onPressed

To perform an action/function when a CupertinoButton in pressed, set the onPressed property with the callback function.

Syntax

Disable CupertinoButton with specific disabled color value.

CupertinoButton(
  onPressed:(){
    //execute code when button is pressed
  },
  child: Text('Button'),
  color: Colors.blue,
)

Example

Flutter Application with a CupertinoButton widget.

SnackBar is displayed when this CupertinoButton is pressed.

main.dart

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

void main() => runApp(const MyApp());

/// main application widget
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Application';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        appBar: AppBar(title: const Text(_title)),
        body: const MyStatefulWidget(),
      ),
    );
  }
}

/// stateful widget that the main application instantiates
class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

/// private State class that goes with MyStatefulWidget
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        children: <Widget>[
          const SizedBox(height: 30,),
          CupertinoButton(
            onPressed: (){
              ScaffoldMessenger.of(context).showSnackBar(
                  const SnackBar(content: Text('You pressed CupertinoButton.')));
            },
            child: const Text('Button'),
            color: Colors.blue,
          ),
        ],
      ),
    );
  }
}

Screenshot

When the button is pressed, a SnackBar appears as shown in the following screenshot.