NSASCIIStringEncoding

Strict 7-bit ASCII encoding within 8-bit chars; ASCII values 0…127 only.
Available in Mac OS X v10.0 and later.

NSNEXTSTEPStringEncoding

8-bit ASCII encoding with NEXTSTEP extensions.
Available in Mac OS X v10.0 and later.

NSJapaneseEUCStringEncoding

8-bit EUC encoding for Japanese text.
Available in Mac OS X v10.0 and later.

NSUTF8StringEncoding

An 8-bit representation of Unicode characters, suitable for transmission or storage by ASCII-based systems.
Available in Mac OS X v10.0 and later.

NSISOLatin1StringEncoding

8-bit ISO Latin 1 encoding.
Available in Mac OS X v10.0 and later.

NSSymbolStringEncoding

8-bit Adobe Symbol encoding vector.
Available in Mac OS X v10.0 and later.

NSNonLossyASCIIStringEncoding

7-bit verbose ASCII to represent all Unicode characters.
Available in Mac OS X v10.0 and later.

NSShiftJISStringEncoding

8-bit Shift-JIS encoding for Japanese text.
Available in Mac OS X v10.0 and later.

NSISOLatin2StringEncoding

8-bit ISO Latin 2 encoding.
Available in Mac OS X v10.0 and later.

NSUnicodeStringEncoding

The canonical Unicode encoding for string objects.
Available in Mac OS X v10.0 and later.

NSWindowsCP1251StringEncoding

Microsoft Windows codepage 1251, encoding Cyrillic characters; equivalent to AdobeStandardCyrillic font encoding.
Available in Mac OS X v10.0 and later.

NSWindowsCP1252StringEncoding

Microsoft Windows codepage 1252; equivalent to WinLatin1.
Available in Mac OS X v10.0 and later.

NSWindowsCP1253StringEncoding

Microsoft Windows codepage 1253, encoding Greek characters.
Available in Mac OS X v10.0 and later.

NSWindowsCP1254StringEncoding

Microsoft Windows codepage 1254, encoding Turkish characters.
Available in Mac OS X v10.0 and later.

NSWindowsCP1250StringEncoding

Microsoft Windows codepage 1250; equivalent to WinLatin2.
Available in Mac OS X v10.0 and later.

NSISO2022JPStringEncoding

ISO 2022 Japanese encoding for email.
Available in Mac OS X v10.0 and later.

NSMacOSRomanStringEncoding

Classic Macintosh Roman encoding.
Available in Mac OS X v10.0 and later.

NSUTF16StringEncoding

An alias for NSUnicodeStringEncoding.
Available in Mac OS X v10.5 and later.

NSUTF16BigEndianStringEncoding

NSUTF16StringEncoding encoding with explicit endianness specified.
Available in Mac OS X v10.5 and later.

NSUTF16LittleEndianStringEncoding

NSUTF16StringEncoding encoding with explicit endianness specified.
Available in Mac OS X v10.5 and later.

NSUTF32StringEncoding

32-bit UTF encoding.
Available in Mac OS X v10.5 and later.

NSUTF32BigEndianStringEncoding

NSUTF32StringEncoding encoding with explicit endianness specified.
Available in Mac OS X v10.5 and later.

NSUTF32LittleEndianStringEncoding

NSUTF32StringEncoding encoding with explicit endianness specified.
Available in Mac OS X v10.5 and later.

NSProprietaryStringEncoding

Installation-specific encoding. (Deprecated. This encoding has been deprecated—there is no replacement.)
Proprietary encodings have not been used since Mac OS X v10.0. You should specify a standard encoding instead.
Available in Mac OS X v10.0 through Mac OS X v10.4.

해당 인코딩들은 NSString.h에 정의 되어 있습니다
EUC_KR 의 인코딩은 0x80000000 + kCFStringEncodingDOSKorean 이렇게 표현해주는것이 제일 안정적 입니다.