---
title: "init(data:encoding:)"
framework: foundation
role: symbol
role_heading: Initializer
path: "foundation/nsstring/init(data:encoding:)"
---

# init(data:encoding:)

Returns an NSString object initialized by converting given data into UTF-16 code units using a given encoding.

## Declaration

```swift
convenience init?(data: Data, encoding: UInt)
```

## Parameters

- `data`: An NSData object containing bytes in encoding and the default plain text format (that is, pure content with no attributes or other markups) for that encoding.
- `encoding`: The encoding used by data. For possible values, see doc://com.apple.foundation/documentation/Foundation/NSStringEncoding.

## Return Value

Return Value An NSString object initialized by converting the bytes in data into UTF-16 code units using encoding. The returned object may be different from the original receiver. Returns nil if the initialization fails for some reason (for example if data does not represent valid data for encoding).

## See Also

### Creating and Initializing Strings

- [init()](foundation/nsstring/init().md)
- [init(bytes:length:encoding:)](foundation/nsstring/init(bytes:length:encoding:).md)
- [init(bytesNoCopy:length:encoding:freeWhenDone:)](foundation/nsstring/init(bytesnocopy:length:encoding:freewhendone:).md)
- [init(characters:length:)](foundation/nsstring/init(characters:length:).md)
- [init(charactersNoCopy:length:freeWhenDone:)](foundation/nsstring/init(charactersnocopy:length:freewhendone:).md)
- [init(string:)](foundation/nsstring/init(string:)-210xa.md)
- [init(format:arguments:)](foundation/nsstring/init(format:arguments:).md)
- [init(format:locale:arguments:)](foundation/nsstring/init(format:locale:arguments:).md)
- [localizedUserNotificationString(forKey:arguments:)](foundation/nsstring/localizedusernotificationstring(forkey:arguments:).md)
- [localizedStringWithFormat(_:_:)](foundation/nsstring/localizedstringwithformat(_:_:).md)
- [unichar](foundation/unichar.md)