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# completeStateRestoration()

Completes the extended state restoration.

```
func completeStateRestoration()
```

## Discussion

This method informs the app that the extended state restoration is completed for the balancing .

If a window has some state that may take a long time to restore, such as a web page, you may use this method and methods to `completeStateRestoration` to extend the period of this crash protection beyond the default.

You call [`extendStateRestoration()`](/documentation/AppKit/NSApplication/extendStateRestoration()) within your implementation of [`restoreWindow(withIdentifier:state:completionHandler:)`](/documentation/AppKit/NSApplication/restoreWindow(withIdentifier:state:completionHandler:)).  You would then call `completeStateRestoration` some time after the window is fully restored.  If the app crashes in the interim, then it may offer to discard restorable state on the next launch.

The [`extendStateRestoration()`](/documentation/AppKit/NSApplication/extendStateRestoration()) and `completeStateRestoration` method act as a counter. Each call to [`extendStateRestoration()`](/documentation/AppKit/NSApplication/extendStateRestoration())increments the counter, and must be matched with a corresponding call to `completeStateRestoration` which decrements it.  When the counter reaches zero, the app is considered to have been fully restored, and any further calls are silently ignored.

This method is thread safe.

---

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