# stringEncoding(for:encodingOptions:convertedString:usedLossyConversion:) Returns the string encoding for the given data as detected by attempting to create a string according to the specified encoding options. ``` class func stringEncoding(for data: Data, encodingOptions opts: [StringEncodingDetectionOptionsKey : Any]? = nil, convertedString string: AutoreleasingUnsafeMutablePointer?, usedLossyConversion: UnsafeMutablePointer?) -> UInt ``` ## Parameters `data` An `NSData` object containing bytes in an encoding to be determined. `opts` Options to use when attempting to determine the string encoding. See `String Encoding Detection Options` for a full list of supported options. `string` If a string encoding could be determined, upon return contains an `NSString` object constructed from data using the determined string encoding. `usedLossyConversion` If a string encoding could be determined, upon return contains a `BOOL` value corresponding to whether lossy conversion was used. ## Return Value An `NSStringEncoding` value, or `0` if a string encoding could not be determined. ## Discussion --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)