---
title: "init(uuid:qualifierData:)"
framework: fskit
role: symbol
role_heading: Initializer
path: "fskit/fsentityidentifier/init(uuid:qualifierdata:)-8xlg1"
---

# init(uuid:qualifierData:)

Creates an entity identifier with the given UUID and qualifier data.

## Declaration

```swift
init?(uuid: UUID, qualifierData: Data)
```

## Parameters

- `uuid`: The UUID to use for this identifier.
- `qualifierData`: The data to distinguish entities that otherwise share the same UUID. Must be exactly eight bytes; any other length causes this initializer to return nil.

## Return Value

Return Value A new identifier, or nil if qualifierData is not exactly eight bytes long.