backButton method
Back button. 返回按钮
Implementation
Widget backButton(BuildContext context) {
return Padding(
padding: const EdgeInsets.symmetric(vertical: 4),
child: IconButton(
onPressed: Navigator.of(context).maybePop,
tooltip: MaterialLocalizations.of(context).closeButtonTooltip,
icon: Icon(
Icons.close,
semanticLabel: MaterialLocalizations.of(context).closeButtonTooltip,
),
),
);
}