Answers for "flutter set button icon"

icon as button flutter

IconButton(
            icon: Icon(
              Icons.directions_transit,
            ),
            iconSize: 50,
            color: Colors.green,
            splashColor: Colors.purple,
            onPressed: () {},
          ),

flutter change the icon of icon button on pressed

bool selected = true;

//...

Widget build(BuildContext context) {
	return Scaffold(
    	body: Center(
          child: IconButton(
              icon: Icon( selected ? Icons.celebration : Icons.title),
              onPressed: () {
                setState(() {
                  selected = !selected;
                });
              },
          ), //IconButton
   		), //Center
    ); //Scaffold
}