---
title: needsPeriodicRefresh
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avcaptionrenderer/scene/needsperiodicrefresh
---

# needsPeriodicRefresh

A Boolean value that indicates whether the scene requires redrawing while your app progresses through the content.

## Declaration

```swift
var needsPeriodicRefresh: Bool { get }
```

## Discussion

Discussion If your app isn’t progressing through the content, a single render at the current time is enough. Choose a refresh rate appropriate for your app. For example, an app may choose rates that match rates of associated video frames or other timing appropriate for the client.

## See Also

### Inspecting the scene

- [timeRange](avfoundation/avcaptionrenderer/scene/timerange.md)
- [hasActiveCaptions](avfoundation/avcaptionrenderer/scene/hasactivecaptions.md)