---
title: deferredStartDelegateCallbackQueue
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avcapturesession/deferredstartdelegatecallbackqueue
---

# deferredStartDelegateCallbackQueue

The dispatch queue on which the session calls deferred start delegate methods.

## Declaration

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

## Discussion

Discussion Call the setDeferredStartDelegate(_:deferredStartDelegateCallbackQueue:) method to specify the dispatch queue on which to call the deferred start delegate methods.

## See Also

### Configuring deferred start

- [isManualDeferredStartSupported](avfoundation/avcapturesession/ismanualdeferredstartsupported.md)
- [automaticallyRunsDeferredStart](avfoundation/avcapturesession/automaticallyrunsdeferredstart.md)
- [runDeferredStartWhenNeeded()](avfoundation/avcapturesession/rundeferredstartwhenneeded().md)
- [deferredStartDelegate](avfoundation/avcapturesession/deferredstartdelegate.md)
- [setDeferredStartDelegate(_:deferredStartDelegateCallbackQueue:)](avfoundation/avcapturesession/setdeferredstartdelegate(_:deferredstartdelegatecallbackqueue:).md)
- [AVCaptureSessionDeferredStartDelegate](avfoundation/avcapturesessiondeferredstartdelegate.md)