---
title: "setVersion(_:)"
framework: objectivec
role: symbol
role_heading: Type Method
path: "objectivec/nsobject-swift.class/setversion(_:)"
---

# setVersion(_:)

Sets the receiver’s version number.

## Declaration

```swift
class func setVersion(_ aVersion: Int)
```

## Parameters

- `aVersion`: The version number for the receiver.

## Discussion

Discussion The version number is helpful when instances of the class are to be archived and reused later. The default version is 0. Special Considerations The version number applies to NSArchiver/NSUnarchiver, but not to NSKeyedArchiver/NSKeyedUnarchiver.  A keyed archiver does not encode class version numbers.

## See Also

### Archiving

- [awakeAfter(using:)](objectivec/nsobject-swift.class/awakeafter(using:).md)
- [classForArchiver](objectivec/nsobject-swift.class/classforarchiver.md)
- [classForCoder](objectivec/nsobject-swift.class/classforcoder.md)
- [classForKeyedArchiver](objectivec/nsobject-swift.class/classforkeyedarchiver.md)
- [classFallbacksForKeyedArchiver()](objectivec/nsobject-swift.class/classfallbacksforkeyedarchiver().md)
- [classForKeyedUnarchiver()](objectivec/nsobject-swift.class/classforkeyedunarchiver().md)
- [replacementObject(for:)](objectivec/nsobject-swift.class/replacementobject(for:)-8ih2x.md)
- [replacementObject(for:)](objectivec/nsobject-swift.class/replacementobject(for:)-2l8ox.md)
- [replacementObject(for:)](objectivec/nsobject-swift.class/replacementobject(for:)-60vwc.md)
- [version()](objectivec/nsobject-swift.class/version().md)