CupertinoTabController class Null safety

Coordinates tab selection between a CupertinoTabBar and a CupertinoTabScaffold.

The index property is the index of the selected tab. Changing its value updates the actively displayed tab of the CupertinoTabScaffold the CupertinoTabController controls, as well as the currently selected tab item of its CupertinoTabBar.

CupertinoTabController can be used to switch tabs:
class MyCupertinoTabScaffoldPage extends StatefulWidget {
  const MyCupertinoTabScaffoldPage({Key? key}) : super(key: key);

  State<MyCupertinoTabScaffoldPage> createState() => _CupertinoTabScaffoldPageState();

class _CupertinoTabScaffoldPageState extends State<MyCupertinoTabScaffoldPage> {
  final CupertinoTabController _controller = CupertinoTabController();

  Widget build(BuildContext context) {
    return CupertinoTabScaffold(
      tabBar: CupertinoTabBar(
        items: const <BottomNavigationBarItem> [
          // ...
      controller: _controller,
      tabBuilder: (BuildContext context, int index) {
        return Center(
          child: CupertinoButton(
            child: const Text('Go to first tab'),
            onPressed: () => _controller.index = 0,

  void dispose() {

See also:



CupertinoTabController({int initialIndex = 0})
Creates a CupertinoTabController to control the tab index of CupertinoTabScaffold and CupertinoTabBar. [...]


hashCode int
The hash code for this object. [...]
read-only, inherited
hasListeners bool
Whether any listeners are currently registered. [...]
@protected, read-only, inherited
index int
The index of the currently selected tab. [...]
read / write
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited


addListener(VoidCallback listener) → void
Register a closure to be called when the object changes. [...]
dispose() → void
Discards any resources used by the object. After this is called, the object is not in a usable state and should be discarded (calls to addListener will throw after the object is disposed). [...]
@mustCallSuper, override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
notifyListeners() → void
Call all the registered listeners. [...]
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes. [...]
toString() String
A string representation of this object. [...]


operator ==(Object other) bool
The equality operator. [...]