---
title: "init(_:)"
framework: foundation
role: symbol
role_heading: Initializer
path: "foundation/locale/measurementsystem-swift.struct/init(_:)"
---

# init(_:)

Creates a measurement system instance from a BCP 47 identifier.

## Declaration

```swift
init(_ identifier: String)
```

## Parameters

- `identifier`: The measurement system’s BCP 47 identifier, like metric or ussystem.

## See Also

### Creating a measurement system instance

- [init(stringLiteral:)](foundation/locale/measurementsystem-swift.struct/init(stringliteral:).md)