---
title: containerIdentifier
framework: contacts
role: symbol
role_heading: Instance Property
path: contacts/cnchangehistoryaddcontactevent/containeridentifier
---

# containerIdentifier

A string that uniquely identifies the container where the user added the contact.

## Declaration

```swift
var containerIdentifier: String? { get }
```

## See Also

### Getting event details

- [contact](contacts/cnchangehistoryaddcontactevent/contact.md)