BackButton class

A Material Design back icon button.

A BackButton is an IconButton with a "back" icon appropriate for the current TargetPlatform. When pressed, the back button calls Navigator.maybePop to return to the previous route unless a custom onPressed callback is provided.

The onPressed callback can, for instance, be used to pop the platform's navigation stack via SystemNavigator instead of Flutter's Navigator in add-to-app situations.

In Material Design 3, both style's ButtonStyle.iconColor and color are used to override the default icon color of BackButton. If both exist, the ButtonStyle.iconColor will override color for states where ButtonStyle.foregroundColor resolves to non-null.

When deciding to display a BackButton, consider using ModalRoute.canPopOf(context) to check whether the current route can be popped. If that value is false (e.g., because the current route is the initial route), the BackButton will not have any effect when pressed, which could frustrate the user.

Requires one of its ancestors to be a Material widget.

See also:

• AppBar, which automatically uses a BackButton in its AppBar.leading slot when the Scaffold has no Drawer and the current Route is not the Navigator's first route.
• BackButtonIcon, which is useful if you need to create a back button that responds differently to being pressed.
• IconButton, which is a more general widget for creating buttons with icons.
• CloseButton, an alternative which may be more appropriate for leaf node pages in the navigation tree.