A string representing the current selection mode of the control. Can be
single, multiple or buttons.
A SegmentedControlSegment[] array representing the segments in this control.
Updating this value immediately updates the control in the touch bar. Updating
deep properties inside this array does not update the touch bar.
A string representing the controls current segment style. Updating this value
immediately updates the control in the touch bar.
An Integer representing the currently selected segment. Changing this value
immediately updates the control in the touch bar. User interaction with the
touch bar will update this value automatically.
TouchBarSegmentedControl