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

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

```
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

<doc://com.apple.documentation/documentation/Swift/true> if `unknownPersonViewController` should perform its default action. Your application may quit as a result of this action. <doc://com.apple.documentation/documentation/Swift/false>: if `unknownPersonViewController` should do nothing. The delegate may perform custom action processing.

## Discussion

---

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