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# addChildCollections(_:)

Adds the specified collections as children of the collection list.

```
func addChildCollections(_ collections: any NSFastEnumeration)
```

## Parameters

`collections`

An array of [`PHCollection`](/documentation/Photos/PHCollection) objects (asset collections or other collection lists) to be added to the collection list.

## Discussion

If you created the change request with a snapshot of the collection list’s contents using the [`init(for:childCollections:)`](/documentation/Photos/PHCollectionListChangeRequest/init(for:childCollections:)) method, Photos inserts the new children after the existing child collections in the collection list. Otherwise, the arrangement of the new children relative to others in the collection is undefined.

---

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