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# QCCompositionPickerViewDelegate

The `QCCompositionPickerViewDelegate` informal protocol defines methods that allow  your application to respond to changes in a composition picker view (a [`QCCompositionPickerView`](/documentation/Quartz/QCCompositionPickerView) object).

## Topics

### Responding to Composition Selections

  <doc://com.apple.documentation/documentation/ObjectiveC/NSObject-swift.class/compositionPickerView(_:didSelect:)>

### Responding to Animation State Changes

  <doc://com.apple.documentation/documentation/ObjectiveC/NSObject-swift.class/compositionPickerViewDidStartAnimating(_:)>

  <doc://com.apple.documentation/documentation/ObjectiveC/NSObject-swift.class/compositionPickerViewWillStopAnimating(_:)>


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