---
title: CNChangeHistoryEvent
framework: contacts
role: symbol
role_heading: Class
path: contacts/cnchangehistoryevent
---

# CNChangeHistoryEvent

An object that represents the user adding, updating, or deleting a contact or group.

## Declaration

```swift
class CNChangeHistoryEvent
```

## Topics

### Processing an event

- [accept(_:)](contacts/cnchangehistoryevent/accept(_:).md)

### Initializers

- [init(coder:)](contacts/cnchangehistoryevent/init(coder:).md)

## Relationships

### Inherits From

- [NSObject](objectivec/nsobject-swift.class.md)

### Inherited By

- [CNChangeHistoryAddContactEvent](contacts/cnchangehistoryaddcontactevent.md)
- [CNChangeHistoryAddGroupEvent](contacts/cnchangehistoryaddgroupevent.md)
- [CNChangeHistoryAddMemberToGroupEvent](contacts/cnchangehistoryaddmembertogroupevent.md)
- [CNChangeHistoryAddSubgroupToGroupEvent](contacts/cnchangehistoryaddsubgrouptogroupevent.md)
- [CNChangeHistoryDeleteContactEvent](contacts/cnchangehistorydeletecontactevent.md)
- [CNChangeHistoryDeleteGroupEvent](contacts/cnchangehistorydeletegroupevent.md)
- [CNChangeHistoryDropEverythingEvent](contacts/cnchangehistorydropeverythingevent.md)
- [CNChangeHistoryRemoveMemberFromGroupEvent](contacts/cnchangehistoryremovememberfromgroupevent.md)
- [CNChangeHistoryRemoveSubgroupFromGroupEvent](contacts/cnchangehistoryremovesubgroupfromgroupevent.md)
- [CNChangeHistoryUpdateContactEvent](contacts/cnchangehistoryupdatecontactevent.md)
- [CNChangeHistoryUpdateGroupEvent](contacts/cnchangehistoryupdategroupevent.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSCoding](foundation/nscoding.md)
- [NSCopying](foundation/nscopying.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)
- [NSSecureCoding](foundation/nssecurecoding.md)

## See Also

### Change history data

- [CNChangeHistoryAddContactEvent](contacts/cnchangehistoryaddcontactevent.md)
- [CNChangeHistoryAddGroupEvent](contacts/cnchangehistoryaddgroupevent.md)
- [CNChangeHistoryAddMemberToGroupEvent](contacts/cnchangehistoryaddmembertogroupevent.md)
- [CNChangeHistoryAddSubgroupToGroupEvent](contacts/cnchangehistoryaddsubgrouptogroupevent.md)
- [CNChangeHistoryDeleteContactEvent](contacts/cnchangehistorydeletecontactevent.md)
- [CNChangeHistoryDeleteGroupEvent](contacts/cnchangehistorydeletegroupevent.md)
- [CNChangeHistoryDropEverythingEvent](contacts/cnchangehistorydropeverythingevent.md)
- [CNChangeHistoryFetchRequest](contacts/cnchangehistoryfetchrequest.md)
- [CNChangeHistoryRemoveMemberFromGroupEvent](contacts/cnchangehistoryremovememberfromgroupevent.md)
- [CNChangeHistoryRemoveSubgroupFromGroupEvent](contacts/cnchangehistoryremovesubgroupfromgroupevent.md)
- [CNChangeHistoryUpdateContactEvent](contacts/cnchangehistoryupdatecontactevent.md)
- [CNChangeHistoryUpdateGroupEvent](contacts/cnchangehistoryupdategroupevent.md)
- [CNChangeHistoryEventVisitor](contacts/cnchangehistoryeventvisitor.md)