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# CKSyncEngineEventType

Describes an event that occurs during a sync operation.

```
enum CKSyncEngineEventType
```

## Topics

### Event types

[`CKSyncEngineEventTypeStateUpdate`](/documentation/CloudKit/CKSyncEngineEventType/stateUpdate)

The sync engine updated its state.

[`CKSyncEngineEventTypeAccountChange`](/documentation/CloudKit/CKSyncEngineEventType/accountChange)

The user signed in or out of their account.

[`CKSyncEngineEventTypeFetchedDatabaseChanges`](/documentation/CloudKit/CKSyncEngineEventType/fetchedDatabaseChanges)

The sync engine has fetched new database changes from the server.

[`CKSyncEngineEventTypeFetchedRecordZoneChanges`](/documentation/CloudKit/CKSyncEngineEventType/fetchedRecordZoneChanges)

The sync engine fetched new record zone changes from the server.

[`CKSyncEngineEventTypeSentDatabaseChanges`](/documentation/CloudKit/CKSyncEngineEventType/sentDatabaseChanges)

The sync engine sent a batch of database changes to the server.

[`CKSyncEngineEventTypeSentRecordZoneChanges`](/documentation/CloudKit/CKSyncEngineEventType/sentRecordZoneChanges)

The sync engine sent a batch of record zone changes to the server.

[`CKSyncEngineEventTypeWillFetchChanges`](/documentation/CloudKit/CKSyncEngineEventType/willFetchChanges)

The sync engine is about to fetch changes from the server.

[`CKSyncEngineEventTypeWillFetchRecordZoneChanges`](/documentation/CloudKit/CKSyncEngineEventType/willFetchRecordZoneChanges)

The sync engine is about to fetch record zone changes from the server for a specific zone.

[`CKSyncEngineEventTypeDidFetchRecordZoneChanges`](/documentation/CloudKit/CKSyncEngineEventType/didFetchRecordZoneChanges)

The sync engine has completed fetching record zone changes from the server for a specific zone.

[`CKSyncEngineEventTypeDidFetchChanges`](/documentation/CloudKit/CKSyncEngineEventType/didFetchChanges)

The sync engine finished fetching changes from the server.

[`CKSyncEngineEventTypeWillSendChanges`](/documentation/CloudKit/CKSyncEngineEventType/willSendChanges)

The sync engine is about to send changes to the server.

[`CKSyncEngineEventTypeDidSendChanges`](/documentation/CloudKit/CKSyncEngineEventType/didSendChanges)

The sync engine finished sending changes to the server.

## Relationships

### Conforms To

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

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

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

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

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

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

---

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