---
title: "CVDisplayLinkIsRunning(_:)"
framework: corevideo
role: symbol
role_heading: Function
path: "corevideo/cvdisplaylinkisrunning(_:)"
---

# CVDisplayLinkIsRunning(_:)

Indicates whether a given display link is running.

## Declaration

```swift
func CVDisplayLinkIsRunning(_ displayLink: CVDisplayLink) -> Bool
```

## Parameters

- `displayLink`: The display link whose run state you want to determine.

## Return Value

Return Value Returns true if the display link is running, false otherwise.

## See Also

### Inspecting Display Links

- [CVDisplayLinkGetCurrentCGDisplay(_:)](corevideo/cvdisplaylinkgetcurrentcgdisplay(_:).md)
- [CVDisplayLinkGetCurrentTime(_:_:)](corevideo/cvdisplaylinkgetcurrenttime(_:_:).md)
- [CVDisplayLinkTranslateTime(_:_:_:)](corevideo/cvdisplaylinktranslatetime(_:_:_:).md)
- [CVDisplayLinkGetActualOutputVideoRefreshPeriod(_:)](corevideo/cvdisplaylinkgetactualoutputvideorefreshperiod(_:).md)
- [CVDisplayLinkGetNominalOutputVideoRefreshPeriod(_:)](corevideo/cvdisplaylinkgetnominaloutputvideorefreshperiod(_:).md)
- [CVDisplayLinkGetOutputVideoLatency(_:)](corevideo/cvdisplaylinkgetoutputvideolatency(_:).md)
- [CVDisplayLinkGetTypeID()](corevideo/cvdisplaylinkgettypeid().md)