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# CNChangeHistoryEvent

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

```
class CNChangeHistoryEvent
```

## Topics

### Processing an event

[`-  acceptEventVisitor:`](/documentation/Contacts/CNChangeHistoryEvent/accept(_:))

Forwards the event to the delegate you provide to process the change-history event.

## Relationships

### Conforms To

[`NSCopying`](/documentation/Foundation/NSCopying)

[`NSSecureCoding`](/documentation/Foundation/NSSecureCoding)

[`Equatable`](/documentation/Swift/Equatable)

[`CVarArg`](/documentation/Swift/CVarArg)

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

[`NSCoding`](/documentation/Foundation/NSCoding)

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

[`Hashable`](/documentation/Swift/Hashable)

### Inherited By

[`CNChangeHistoryUpdateGroupEvent`](/documentation/Contacts/CNChangeHistoryUpdateGroupEvent)

[`CNChangeHistoryRemoveSubgroupFromGroupEvent`](/documentation/Contacts/CNChangeHistoryRemoveSubgroupFromGroupEvent)

[`CNChangeHistoryDeleteContactEvent`](/documentation/Contacts/CNChangeHistoryDeleteContactEvent)

[`CNChangeHistoryAddGroupEvent`](/documentation/Contacts/CNChangeHistoryAddGroupEvent)

[`CNChangeHistoryDeleteGroupEvent`](/documentation/Contacts/CNChangeHistoryDeleteGroupEvent)

[`CNChangeHistoryAddContactEvent`](/documentation/Contacts/CNChangeHistoryAddContactEvent)

[`CNChangeHistoryAddMemberToGroupEvent`](/documentation/Contacts/CNChangeHistoryAddMemberToGroupEvent)

[`CNChangeHistoryAddSubgroupToGroupEvent`](/documentation/Contacts/CNChangeHistoryAddSubgroupToGroupEvent)

[`CNChangeHistoryRemoveMemberFromGroupEvent`](/documentation/Contacts/CNChangeHistoryRemoveMemberFromGroupEvent)

[`CNChangeHistoryDropEverythingEvent`](/documentation/Contacts/CNChangeHistoryDropEverythingEvent)

[`CNChangeHistoryUpdateContactEvent`](/documentation/Contacts/CNChangeHistoryUpdateContactEvent)

### Inherits From

[`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class)

---

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