---
title: NSSegmentedControl.SwitchTracking.selectOne
framework: appkit
role: symbol
role_heading: Case
path: appkit/nssegmentedcontrol/switchtracking/selectone
---

# NSSegmentedControl.SwitchTracking.selectOne

Only one segment in the control can be selected at a time.

## Declaration

```swift
case selectOne
```

## Discussion

Discussion This mode functions as a radio button and is illustrated by the view selection control in Finder, which allows you to toggle between icon view, list view, column view, and Cover Flow.

## See Also

### Constants

- [NSSegmentedControl.SwitchTracking.selectAny](appkit/nssegmentedcontrol/switchtracking/selectany.md)
- [NSSegmentedControl.SwitchTracking.momentary](appkit/nssegmentedcontrol/switchtracking/momentary.md)
- [NSSegmentedControl.SwitchTracking.momentaryAccelerator](appkit/nssegmentedcontrol/switchtracking/momentaryaccelerator.md)