flutter - How to use IconButton

Flutter IconButton

The IconButton class represents a material design icon button. IconButton is a picture printed on a material widget that reacts to touches by filling with color.

The flutter developers commonly used the Icon buttons in the AppBar actions field, but IconButtons can be used in many other places as well. The flutter app developers can leave the onPressed callback null to disable an IconButton, then it will not react to touch.

The IconButton class has several useful properties such as alignment, autofocus, color, disabledColor, focusColor, highlightColor, hoverColor, icon, iconSize, isSelected, onPressed, padding, selectedIcon, splashColor, style, and tooltip.

The IconButton class’s alignment property defines how the icon is positioned within the IconButton. The color property defines the color to use for the icon inside the button if the icon is enabled. The icon property defines the icon to display inside the button. The iconSize property defines the size of the icon inside the button.

The IconButton class styleFrom() static method is a static convenience method that constructs an icon button ButtonStyle given simple values. But this method is only used for Material 3.

The following flutter application development tutorial will demonstrate how we can use an IconButton widget inside a flutter app. Here we put an IconButton on the app user interface. We set an icon for the IconButton widget. When a user pressed the IconButton a like counter is going up. We also display the like counter update on a Text widget.

main.dart

import 'package:flutter/material.dart';

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

class FlutterExample extends StatelessWidget {
  const FlutterExample({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Flutter Example',
        theme: ThemeData(primarySwatch: Colors.deepOrange),
        home: const StateExample());
  }
}

class StateExample extends StatefulWidget {
  const StateExample({Key? key}) : super(key: key);

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

class _StateExampleState extends State<StateExample> {
  int liked  = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: const Color(0xFFFEFEFA),
      appBar: AppBar(
        title: const Text("Flutter - IconButton example"),
      ),
      body: bodyContent(),
    );
  }

  bodyContent() {
    return Center(
        child: Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            IconButton(
                icon: const Icon(Icons.favorite),
                onPressed: () {
                  setState(() {
                    liked ++;
                  });
                }
            ),
            const SizedBox(width: 12),
            Text(
              "Liked : $liked",
              style: const TextStyle(
                  fontWeight: FontWeight.bold,
                  color: Colors.blueAccent
              ),
            ),
          ],
        )
    );
  }
}