Make Function parameter optional in custom widget flutter
class TextInputWithIcon extends StatefulWidget {
final String iconPath;
final String placeHolder;
final Function(bool)? onFocusChange; // nullable and optional
const TextInputWithIcon(
{Key? key,
required this.iconPath, // non-nullable and required
this.placeHolder = "", // non-nullable but optional with a default value
this.onFocusChange, // nullable and optional
})
: super(key: key);
@override
_TextInputWithIconState createState() => _TextInputWithIconState();
}