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# AVCaptureSessionDeferredStartDelegate

A protocol that defines the interface to respond to events about a capture session’s deferred start.

```
protocol AVCaptureSessionDeferredStartDelegate : NSObjectProtocol
```

## Topics

### Responding to deferred start events

[`sessionDidRunDeferredStart(_:)`](/documentation/AVFoundation/AVCaptureSessionDeferredStartDelegate/sessionDidRunDeferredStart(_:))

This method gets called by the session when deferred start has finished running.

[`sessionWillRunDeferredStart(_:)`](/documentation/AVFoundation/AVCaptureSessionDeferredStartDelegate/sessionWillRunDeferredStart(_:))

This method gets called by the session when deferred start is about to run.


---

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