---
title: "unknownPersonViewController(_:shouldPerformDefaultActionForPerson:property:identifier:)"
framework: addressbookui
role: symbol
role_heading: Instance Method
path: "addressbookui/abunknownpersonviewcontrollerdelegate/unknownpersonviewcontroller(_:shouldperformdefaultactionforperson:property:identifier:)"
---

# unknownPersonViewController(_:shouldPerformDefaultActionForPerson:property:identifier:)

Sent when the user selects a property value of the person displayed in a person view controller.

## Declaration

```swift
optional func unknownPersonViewController(_ personViewController: ABUnknownPersonViewController, shouldPerformDefaultActionForPerson person: ABRecord, property: ABPropertyID, identifier: ABMultiValueIdentifier) -> Bool
```

## Parameters

- `person`: The person unknownPersonViewController is displaying.
- `property`: The property whose value the user selected.
- `identifier`: The identifier for the value the user selected if property is a multivalue property; otherwise, kABMultiValueInvalidIdentifier.

## Return Value

Return Value true if unknownPersonViewController should perform its default action. Your application may quit as a result of this action. false: if unknownPersonViewController should do nothing. The delegate may perform custom action processing.

## See Also

### Responding to User Events

- [unknownPersonViewController(_:didResolveToPerson:)](addressbookui/abunknownpersonviewcontrollerdelegate/unknownpersonviewcontroller(_:didresolvetoperson:).md)