thumbIcon property

WidgetStateProperty<Icon?>? thumbIcon
final

The icon to use on the thumb of this switch.

Resolved in the following states:

This example resolves the thumbIcon based on the current WidgetState of the CupertinoSwitch, providing a different Icon when it is WidgetState.disabled.
link 
CupertinoSwitch(
  value: true,
  onChanged: (bool value) { },
  thumbIcon: WidgetStateProperty.resolveWith<Icon?>((Set<WidgetState> states) {
    if (states.contains(WidgetState.disabled)) {
      return const Icon(Icons.close);
    }
    return null; // All other states will use the default thumbIcon.
  }),
)

If null, then the CupertinoSwitch does not have any icons on the thumb.

Implementation

final WidgetStateProperty<Icon?>? thumbIcon;