---
title: "setDefaultFormatterBehavior(_:)"
framework: foundation
role: symbol
role_heading: Type Method
path: "foundation/numberformatter/setdefaultformatterbehavior(_:)"
---

# setDefaultFormatterBehavior(_:)

Sets the default formatter behavior for new instances of NSNumberFormatter .

## Declaration

```swift
class func setDefaultFormatterBehavior(_ behavior: NumberFormatter.Behavior)
```

## Parameters

- `behavior`: An NSNumberFormatterBehavior constant that indicates the revision of the class providing the default behavior.

## See Also

### Configuring Formatter Behavior and Style

- [formatterBehavior](foundation/numberformatter/formatterbehavior.md)
- [defaultFormatterBehavior()](foundation/numberformatter/defaultformatterbehavior().md)
- [numberStyle](foundation/numberformatter/numberstyle.md)
- [generatesDecimalNumbers](foundation/numberformatter/generatesdecimalnumbers.md)