---
title: "init(_:)"
framework: applearchive
role: symbol
role_heading: Initializer
path: "applearchive/archiveheader/fieldkeyset/init(_:)"
---

# init(_:)

Creates a new field key set from the specified comma-separated string of three-letter keys.

## Declaration

```swift
init?(_ s: String)
```

## Parameters

- `s`: The key set string representation.

## Discussion

Discussion Apple Archive supports the following three-letter keys:

## See Also

### Creating a Field Key Set

- [init()](applearchive/archiveheader/fieldkeyset/init().md)
- [init(copying:)](applearchive/archiveheader/fieldkeyset/init(copying:).md)