CupertinoTabBar class
An iOS-styled bottom navigation tab bar.
Displays multiple tabs using BottomNavigationBarItem with one tab being active, the first tab by default.
This StatelessWidget doesn't store the active tab itself. You must
listen to the onTap callbacks and call setState with a new currentIndex
for the new selection to reflect. This can also be done automatically
by wrapping this with a CupertinoTabScaffold.
Tab changes typically trigger a switch between Navigators, each with its own navigation stack, per standard iOS design. This can be done by using CupertinoTabViews inside each tab builder in CupertinoTabScaffold.
If the given backgroundColor's opacity is not 1.0 (which is the case by default), it will produce a blurring effect to the content behind it.
When used as CupertinoTabScaffold.tabBar, by default CupertinoTabBar
disables text scaling to match the native iOS behavior. To override
this behavior, wrap each of the navigationBar's components inside a
MediaQuery with the desired TextScaler.
To create a local project with this code sample, run:
flutter create --sample=cupertino.CupertinoTabBar.1 mysample
See also:
- CupertinoTabScaffold, which hosts the CupertinoTabBar at the bottom.
- BottomNavigationBarItem, an item in a CupertinoTabBar.
- developer.apple.com/design/human-interface-guidelines/ios/bars/tab-bars/
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- CupertinoTabBar
- Implemented types
Constructors
-
CupertinoTabBar({Key? key, required List<
BottomNavigationBarItem> items, ValueChanged<int> ? onTap, int currentIndex = 0, Color? backgroundColor, Color? activeColor, Color inactiveColor = _kDefaultTabBarInactiveColor, double iconSize = 30.0, double height = _kTabBarHeight, Border? border = const Border(top: BorderSide(color: _kDefaultTabBarBorderColor, width: 0.0))}) -
Creates a tab bar in the iOS style.
const
Properties
- activeColor → Color?
-
The foreground color of the icon and title for the BottomNavigationBarItem
of the selected tab.
final
- backgroundColor → Color?
-
The background color of the tab bar. If it contains transparency, the
tab bar will automatically produce a blurring effect to the content
behind it.
final
- border → Border?
-
The border of the CupertinoTabBar.
final
- currentIndex → int
-
The index into items of the current active item.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- height → double
-
The height of the CupertinoTabBar.
final
- iconSize → double
-
The size of all of the BottomNavigationBarItem icons.
final
- inactiveColor → Color
-
The foreground color of the icon and title for the BottomNavigationBarItems
in the unselected state.
final
-
items
→ List<
BottomNavigationBarItem> -
The interactive items laid out within the bottom navigation bar.
final
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
-
onTap
→ ValueChanged<
int> ? -
The callback that is called when a item is tapped.
final
- preferredSize → Size
-
The size this widget would prefer if it were otherwise unconstrained.
no setteroverride
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
build(
BuildContext context) → Widget -
Describes the part of the user interface represented by this widget.
override
-
copyWith(
{Key? key, List< BottomNavigationBarItem> ? items, Color? backgroundColor, Color? activeColor, Color? inactiveColor, double? iconSize, double? height, Border? border, int? currentIndex, ValueChanged<int> ? onTap}) → CupertinoTabBar - Create a clone of the current CupertinoTabBar but with provided parameters overridden.
-
createElement(
) → StatelessElement -
Creates a StatelessElement to manage this widget's location in the tree.
inherited
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of DiagnosticsNode objects 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
-
opaque(
BuildContext context) → bool - Indicates whether the tab bar is fully opaque or can have contents behind it show through it.
-
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