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# alertView(_:willDismissWithButtonIndex:)

Sent to the delegate before an alert view is dismissed.

```
optional func alertView(_ alertView: UIAlertView, willDismissWithButtonIndex buttonIndex: Int)
```

## Parameters

`alertView`

The alert view that is about to be dismissed.

`buttonIndex`

The index of the button that was clicked. The button indices start at `0`. If this is the cancel button index, the alert view is canceling. If `-1`, the cancel button index is not set.

## Discussion

This method is invoked before the animation begins and the view is hidden.

---

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