CupertinoTabScaffold class
Implements a tabbed iOS application's root layout and behavior structure.
The scaffold lays out the tab bar at the bottom and the content between or behind the tab bar.
A tabBar and a tabBuilder are required. The CupertinoTabScaffold will automatically listen to the provided CupertinoTabBar's tap callbacks to change the active tab.
A controller can be used to provide an initially selected tab index and manage
subsequent tab changes. If a controller is not specified, the scaffold will
create its own CupertinoTabController and manage it internally. Otherwise
it's up to the owner of controller to call dispose on it after finish
using it.
Tabs' contents are built with the provided tabBuilder at the active tab index. The tabBuilder must be able to build the same number of pages as there are tabBar items. Inactive tabs will be moved Offstage and their animations disabled.
Adding/removing tabs, or changing the order of tabs is supported but not recommended. Doing so is against the iOS human interface guidelines, and CupertinoTabScaffold may lose some tabs' state in the process.
Use CupertinoTabView as the root widget of each tab to support tabs with parallel navigation state and history. Since each CupertinoTabView contains a Navigator, rebuilding the CupertinoTabView with a different WidgetBuilder instance in CupertinoTabView.builder will not recreate the CupertinoTabView's navigation stack or update its UI. To update the contents of the CupertinoTabView after it's built, trigger a rebuild (via State.setState, for instance) from its descendant rather than from its ancestor.
To create a local project with this code sample, run:
flutter create --sample=cupertino.CupertinoTabScaffold.1 mysample
To push a route above all tabs instead of inside the currently selected one
(such as when showing a dialog on top of this scaffold), use
Navigator.of(rootNavigator: true) from inside the BuildContext of a
CupertinoTabView.
See also:
- CupertinoTabBar, the bottom tab bar inserted in the scaffold.
- CupertinoTabController, the selection state of this widget.
- CupertinoTabView, the typical root content of each tab that holds its own Navigator stack.
- CupertinoPageRoute, a route hosting modal pages with iOS style transitions.
- CupertinoPageScaffold, typical contents of an iOS modal page implementing layout with a navigation bar on top.
- iOS human interface guidelines.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- CupertinoTabScaffold
Constructors
- CupertinoTabScaffold({Key? key, required CupertinoTabBar tabBar, required IndexedWidgetBuilder tabBuilder, CupertinoTabController? controller, Color? backgroundColor, bool resizeToAvoidBottomInset = true, String? restorationId})
- Creates a layout for applications with a tab bar at the bottom.
Properties
- backgroundColor → Color?
-
The color of the widget that underlies the entire scaffold.
final
- controller → CupertinoTabController?
-
Controls the currently selected tab index of the tabBar, as well as the
active tab index of the tabBuilder. Providing a different controller
will also update the scaffold's current active index to the new controller's
index value.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- resizeToAvoidBottomInset → bool
-
Whether the body should size itself to avoid the window's bottom inset.
final
- restorationId → String?
-
Restoration ID to save and restore the state of the CupertinoTabScaffold.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- tabBar → CupertinoTabBar
-
The tabBar is a CupertinoTabBar drawn at the bottom of the screen
that lets the user switch between different tabs in the main content area
when present.
final
- tabBuilder → IndexedWidgetBuilder
-
An IndexedWidgetBuilder that's called when tabs become active.
final
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< CupertinoTabScaffold> -
Creates the mutable state for this widget at a given location in the tree.
override
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of
DiagnosticsNodeobjects describing this node's children.inherited -
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toDiagnosticsNode(
{String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode -
Returns a debug representation of the object that is used by debugging
tools and by DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
A string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a string representation of this node and its descendants.
inherited
-
toStringShallow(
{String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a one-line detailed description of the object.
inherited
-
toStringShort(
) → String -
A short, textual description of this widget.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited