---
title: metadataObjectsCallbackQueue
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avcapturemetadataoutput/metadataobjectscallbackqueue
---

# metadataObjectsCallbackQueue

The dispatch queue on which to execute the delegate’s methods.

## Declaration

```swift
var metadataObjectsCallbackQueue: dispatch_queue_t? { get }
```

## Discussion

Discussion To set the dispatch queue, you must use the setMetadataObjectsDelegate(_:queue:) method.

## See Also

### Receiving captured metadata objects

- [setMetadataObjectsDelegate(_:queue:)](avfoundation/avcapturemetadataoutput/setmetadataobjectsdelegate(_:queue:).md)
- [metadataObjectsDelegate](avfoundation/avcapturemetadataoutput/metadataobjectsdelegate.md)
- [AVCaptureMetadataOutputObjectsDelegate](avfoundation/avcapturemetadataoutputobjectsdelegate.md)