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# QCCompositionParameterViewDelegate

A protocol for composition parameter view’s delegate.

## Discussion

This informal protocol allows your application to define which parameters should be visible in a [`QCCompositionParameterView`](/documentation/Quartz/QCCompositionParameterView) object.

## Topics

### Responding to Composition Selections

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

### Responding when an Input Parameter Changes

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


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