# UnicodeCodec Implementations ## Topics ### Initializers [`init()`](/documentation/Swift/Unicode/UTF16/init()) Creates an instance of the UTF-16 codec. ### Instance Methods [`func decode(inout I) -> UnicodeDecodingResult`](/documentation/Swift/Unicode/UTF16/decode(_:)-swift.method) Starts or continues decoding a UTF-16 sequence. ### Type Methods [`static func encode(Unicode.Scalar, into: (Unicode.UTF16.CodeUnit) -> Void)`](/documentation/Swift/Unicode/UTF16/encode(_:into:)) Encodes a Unicode scalar as a series of code units by calling the given closure on each code unit. --- 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)