CupertinoSwitch class Null safety

An iOS-style switch.

Used to toggle the on/off state of a single setting.

The switch itself does not maintain any state. Instead, when the state of the switch changes, the widget calls the onChanged callback. Most widgets that use a switch will listen for the onChanged callback and rebuild the switch with a new value to update the visual appearance of the switch.

link
This example shows a toggleable CupertinoSwitch. When the thumb slides to the other side of the track, the switch is toggled between on/off.
To create a local project with this code sample, run:
flutter create --sample=cupertino.CupertinoSwitch.1 mysample

link
This sample shows how to use a CupertinoSwitch in a ListTile. The MergeSemantics is used to turn the entire ListTile into a single item for accessibility tools. 
MergeSemantics(
  child: ListTile(
    title: const Text('Lights'),
    trailing: CupertinoSwitch(
      value: _lights,
      onChanged: (bool value) { setState(() { _lights = value; }); },
    ),
    onTap: () { setState(() { _lights = !_lights; }); },
  ),
)

See also:

Inheritance

Constructors

CupertinoSwitch({Key? key, required bool value, required ValueChanged<bool>? onChanged, Color? activeColor, Color? trackColor, Color? thumbColor, DragStartBehavior dragStartBehavior = DragStartBehavior.start})
Creates an iOS-style switch.
const

Properties

activeColor → Color?
The color to use when this switch is on.
final
dragStartBehavior → DragStartBehavior
Determines the way that drag start behavior is handled.
final
hashCode → int
The hash code for this object.
nonVirtual">@nonVirtualread-onlyinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
onChanged → ValueChanged<bool>?
Called when the user toggles with switch on or off.
final
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
thumbColor → Color?
The color to use for the thumb of the switch.
final
trackColor → Color?
The color to use for the background when the switch is off.
final
value → bool
Whether this switch is on or off.
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<CupertinoSwitch>
Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
protected">@protectedinherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent 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.
nonVirtual">@nonVirtualinherited