trackOutlineColor property

WidgetStateProperty<Color?>? trackOutlineColor
final

The outline color of this CupertinoSwitch's track.

Resolved in the following states:

This example resolves the trackOutlineColor based on the current WidgetState of the CupertinoSwitch, providing a different Color when it is WidgetState.disabled.
link 
CupertinoSwitch(
  value: true,
  onChanged: (bool value) { },
  trackOutlineColor: WidgetStateProperty.resolveWith<Color?>((Set<WidgetState> states) {
    if (states.contains(WidgetState.disabled)) {
      return CupertinoColors.activeOrange.withOpacity(.48);
    }
    return null; // Use the default color.
  }),
)

The CupertinoSwitch track has no outline by default.

Implementation

final WidgetStateProperty<Color?>? trackOutlineColor;