---
title: numberFormatter
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/massformatter/numberformatter
---

# numberFormatter

The number formatter used to format the numbers in a mass strings.

## Declaration

```swift
@NSCopying var numberFormatter: NumberFormatter! { get set }
```

## Discussion

Discussion This property defaults to a number formatter using the NumberFormatter.Style.decimal style. You can provide a different number formatter to customize the mass string’s appearance.

## See Also

### Formatting Mass Strings

- [isForPersonMassUse](foundation/massformatter/isforpersonmassuse.md)
- [getObjectValue(_:for:errorDescription:)](foundation/massformatter/getobjectvalue(_:for:errordescription:).md)
- [string(fromKilograms:)](foundation/massformatter/string(fromkilograms:).md)
- [string(fromValue:unit:)](foundation/massformatter/string(fromvalue:unit:).md)
- [unitString(fromKilograms:usedUnit:)](foundation/massformatter/unitstring(fromkilograms:usedunit:).md)
- [unitString(fromValue:unit:)](foundation/massformatter/unitstring(fromvalue:unit:).md)
- [unitStyle](foundation/massformatter/unitstyle.md)