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# delegate

The layer’s delegate object.

```
weak var delegate: (any CALayerDelegate)? { get set }
```

## Discussion

You can use a delegate object to provide the layer’s contents, handle the layout of any sublayers, and provide custom actions in response to layer-related changes. The object you assign to this property should implement one or more of the methods of the [`CALayerDelegate`](/documentation/QuartzCore/CALayerDelegate) informal protocol. For more information about that protocol, see `CALayerDelegate`

In iOS, if the layer is associated with a <doc://com.apple.documentation/documentation/UIKit/UIView> object, this property *must* be set to the view that owns the layer.

---

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