A Unicode encoding form that translates between Unicode scalar values and form-specific code units.

    protocol UnicodeCodec : _UnicodeEncoding

    The UnicodeCodec protocol declares methods that decode code unit sequences into Unicode scalar values and encode Unicode scalar values into code unit sequences. The standard library implements codecs for the UTF-8, UTF-16, and UTF-32 encoding schemes as the UTF8, UTF16, and UTF32 types, respectively. Use the Unicode.Scalar type to work with decoded Unicode scalar values.