How to trigger a button action without pressing it with flutter?-CodePudding

I'm using flutter for my first mobile application. I want to trigger an action without clicking a button. this is the code :

  IconButton(
                icon: Icon(
                    characteristic.isNotifying
                        ? Icons.sync_disabled
                        : Icons.sync,
                    color: Theme.of(context).iconTheme.color?.withOpacity(0.5)),
                onPressed: onNotificationPressed,
              )

Thanks in advance for your help

CodePudding user response：

you can do something like this...

import 'package:flutter/material.dart';

class SomePage extends StatefulWidget {
  const SomePage({super.key});

  @override
  State<SomePage> createState() => _SomePageState();
}

class _SomePageState extends State<SomePage> {
  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback(_afterLayout);
  }

  void _afterLayout(_) {
    print('screen is loaded');
  }

  @override
  Widget build(BuildContext context) {
    return Container();
  }
}

CodePudding user response：

you want to do something on 'on pressed' just make a void function and call the function in 'inItState' and here you go. you can also manage the conditions when,how or why the function should run.


import 'package:flutter/material.dart';

class SomePage extends StatefulWidget {
  const SomePage({super.key});

  @override
  State<SomePage> createState() => _SomePageState();
}

class _SomePageState extends State<SomePage> {
void yourfunction(){
 all the functionalities you want on your button press`enter code here`
}
  @override
  void initState() {
    super.initState();
   yourfunction();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
child: IconButton(
                icon: Icon(
                    characteristic.isNotifying
                        ? Icons.sync_disabled
                        : Icons.sync,
                    color: Theme.of(context).iconTheme.color?.withOpacity(0.5)),
                onPressed: yourfunction();
              )
);
  }
}