---
title: systemVersion
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/nsunarchiver/systemversion-swift.property
---

# systemVersion

The system version number in effect when the archive was created.

## Declaration

```swift
var systemVersion: UInt32 { get }
```

## Discussion

Discussion This information is available as soon as the receiver has been initialized.

## See Also

### Managing an NSUnarchiver

- [isAtEnd](foundation/nsunarchiver/isatend.md)