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# AUCustomViewPersistentData

A protocol that defines the methods an Audio Unit host calls to manage view data.

```
protocol AUCustomViewPersistentData
```

## Topics

### Accessing View State

[`customViewPersistentData`](/documentation/CoreAudioKit/AUCustomViewPersistentData/customViewPersistentData)

Called by the host application to obtain view state data from a custom Cocoa view.


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