How to resizing an Icon / Icon Button in Flutter?

Question

I have 2 questions.

1. how to scale our icon ? I mean not a default icon from Flutter. but when you change into an Image. I have an Icon Button with an image like

Answer 1

Below code set width & height for the IconButton and make it to the center of your Container.

 Container(
            height: 18.0,
            width: 18.0,
            color: Colors.yellow,
            child: new IconButton(
              padding: new EdgeInsets.all(0.0),
              color: Colors.red,
              icon: new Icon(Icons.clear, size: 18.0),
              onPressed: null,
            )
        )

Output: