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# doubleValueForSelectedSegment

When the tracking mode for the control is set to use a momentary accelerator, returns a value for the selected segment.

```
var doubleValueForSelectedSegment: Double { get }
```

## Return Value

The value of the selected segment interpreted as a double-precision floating-point number.

## Discussion

This method is intended for use with controls whose tracking mode is set to [`NSSegmentedControl.SwitchTracking.momentaryAccelerator`](/documentation/AppKit/NSSegmentedControl/SwitchTracking/momentaryAccelerator). An assertion will occur if this method is called for other types of segmented controls.

## See Also

[`NSSegmentedControl.SwitchTracking.momentaryAccelerator`](/documentation/AppKit/NSSegmentedControl/SwitchTracking/momentaryAccelerator)

A tracking mode that sends repeating actions as pressure changes on Force Touch systems, stopping when someone releases the segment.

[`trackingMode`](/documentation/AppKit/NSSegmentedControl/trackingMode)

The type of tracking behavior the control exhibits.


---

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