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# NSSnapshotEventType

Constants that specify the reason the managed object may need to reinitialize its values.

```
struct NSSnapshotEventType
```

## Topics

### Event Types

[`undoInsertion`](/documentation/CoreData/NSSnapshotEventType/undoInsertion)

Specifies a change due to undo from insertion.

[`undoDeletion`](/documentation/CoreData/NSSnapshotEventType/undoDeletion)

Specifies a change due to undo from deletion.

[`undoUpdate`](/documentation/CoreData/NSSnapshotEventType/undoUpdate)

Specifies a change due to a property-level undo.

[`rollback`](/documentation/CoreData/NSSnapshotEventType/rollback)

Specifies a change due to the managed object context being rolled back.

[`refresh`](/documentation/CoreData/NSSnapshotEventType/refresh)

Specifies a change due to the managed object being refreshed.

[`mergePolicy`](/documentation/CoreData/NSSnapshotEventType/mergePolicy)

Specifies a change due to conflict resolution during a save operation.


---

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