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# GCControllerUserCustomizationsDidChangeNotification

A notification that posts when the user customizes the button mappings or other settings of a controller.

```
extern NSString * const GCControllerUserCustomizationsDidChangeNotification;
```

## Discussion

Use this notification to update your interface when the mappings change. The notification object is the [`GCController`](/documentation/GameController/GCController) object that the user customizes.

The system posts this notification on the main thread.

---

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