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# presentationControllerShouldDismiss(_:)

Asks the delegate for permission to dismiss the presentation.

```
optional func presentationControllerShouldDismiss(_ presentationController: UIPresentationController) -> Bool
```

## Parameters

`presentationController`

The presentation controller that manages the adaptivity change.

## Return Value

<doc://com.apple.documentation/documentation/Swift/true> to allow the system to dismiss the presentation, <doc://com.apple.documentation/documentation/Swift/false> to refuse the dismissal.

## Discussion

The system may call this method at any time. This method isn’t guaranteed to be followed by a call to [`presentationControllerWillDismiss(_:)`](/documentation/UIKit/UIAdaptivePresentationControllerDelegate/presentationControllerWillDismiss(_:)) or [`presentationControllerDidDismiss(_:)`](/documentation/UIKit/UIAdaptivePresentationControllerDelegate/presentationControllerDidDismiss(_:)). Make sure that your implementation of this method returns quickly.

## See Also

[Disabling the pull-down gesture for a sheet](/documentation/UIKit/disabling-the-pull-down-gesture-for-a-sheet)

Ensure a positive user experience when presenting a view controller as a sheet.


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