ios 更多的编解码格式

External String Encodings
CFStringEncoding constants for encodings that may be supported by CFString.

enum {
    kCFStringEncodingMacRoman = 0L,
    kCFStringEncodingMacJapanese = 1,
    kCFStringEncodingMacChineseTrad = 2,
    kCFStringEncodingMacKorean = 3,
    kCFStringEncodingMacArabic = 4,
    kCFStringEncodingMacHebrew = 5,
    kCFStringEncodingMacGreek = 6,
    kCFStringEncodingMacCyrillic = 7,
    kCFStringEncodingMacDevanagari = 9,
    kCFStringEncodingMacGurmukhi = 10,
    kCFStringEncodingMacGujarati = 11,
    kCFStringEncodingMacOriya = 12,
    kCFStringEncodingMacBengali = 13,
    kCFStringEncodingMacTamil = 14,
    kCFStringEncodingMacTelugu = 15,
    kCFStringEncodingMacKannada = 16,
    kCFStringEncodingMacMalayalam = 17,
    kCFStringEncodingMacSinhalese = 18,
    kCFStringEncodingMacBurmese = 19,
    kCFStringEncodingMacKhmer = 20,
    kCFStringEncodingMacThai = 21,
    kCFStringEncodingMacLaotian = 22,
    kCFStringEncodingMacGeorgian = 23,
    kCFStringEncodingMacArmenian = 24,
    kCFStringEncodingMacChineseSimp = 25,
    kCFStringEncodingMacTibetan = 26,
    kCFStringEncodingMacMongolian = 27,
    kCFStringEncodingMacEthiopic = 28,
    kCFStringEncodingMacCentralEurRoman = 29,
    kCFStringEncodingMacVietnamese = 30,
    kCFStringEncodingMacExtArabic = 31,
    kCFStringEncodingMacSymbol = 33,
    kCFStringEncodingMacDingbats = 34,
    kCFStringEncodingMacTurkish = 35,
    kCFStringEncodingMacCroatian = 36,
    kCFStringEncodingMacIcelandic = 37,
    kCFStringEncodingMacRomanian = 38,
    kCFStringEncodingMacCeltic = 39,
    kCFStringEncodingMacGaelic = 40,
    kCFStringEncodingMacFarsi = 0x8C,
    kCFStringEncodingMacUkrainian = 0x98,
    kCFStringEncodingMacInuit = 0xEC,
    kCFStringEncodingMacVT100 = 0xFC,
    kCFStringEncodingMacHFS = 0xFF,
    kCFStringEncodingISOLatin1 = 0x0201,
    kCFStringEncodingISOLatin2 = 0x0202,
    kCFStringEncodingISOLatin3 = 0x0203,
    kCFStringEncodingISOLatin4 = 0x0204,
    kCFStringEncodingISOLatinCyrillic = 0x0205,
    kCFStringEncodingISOLatinArabic = 0x0206,
    kCFStringEncodingISOLatinGreek = 0x0207,
    kCFStringEncodingISOLatinHebrew = 0x0208,
    kCFStringEncodingISOLatin5 = 0x0209,
    kCFStringEncodingISOLatin6 = 0x020A,
    kCFStringEncodingISOLatinThai = 0x020B,
    kCFStringEncodingISOLatin7 = 0x020D,
    kCFStringEncodingISOLatin8 = 0x020E,
    kCFStringEncodingISOLatin9 = 0x020F,
    kCFStringEncodingISOLatin10 = 0x0210,
    kCFStringEncodingDOSLatinUS = 0x0400,
    kCFStringEncodingDOSGreek = 0x0405,
    kCFStringEncodingDOSBalticRim = 0x0406,
    kCFStringEncodingDOSLatin1 = 0x0410,
    kCFStringEncodingDOSGreek1 = 0x0411,
    kCFStringEncodingDOSLatin2 = 0x0412,
    kCFStringEncodingDOSCyrillic = 0x0413,
    kCFStringEncodingDOSTurkish = 0x0414,
    kCFStringEncodingDOSPortuguese = 0x0415,
    kCFStringEncodingDOSIcelandic = 0x0416,
    kCFStringEncodingDOSHebrew = 0x0417,
    kCFStringEncodingDOSCanadianFrench = 0x0418,
    kCFStringEncodingDOSArabic = 0x0419,
    kCFStringEncodingDOSNordic = 0x041A,
    kCFStringEncodingDOSRussian = 0x041B,
    kCFStringEncodingDOSGreek2 = 0x041C,
    kCFStringEncodingDOSThai = 0x041D,
    kCFStringEncodingDOSJapanese = 0x0420,
    kCFStringEncodingDOSChineseSimplif = 0x0421,
    kCFStringEncodingDOSKorean = 0x0422,
    kCFStringEncodingDOSChineseTrad = 0x0423,
    kCFStringEncodingWindowsLatin1 = 0x0500,
    kCFStringEncodingWindowsLatin2 = 0x0501,
    kCFStringEncodingWindowsCyrillic = 0x0502,
    kCFStringEncodingWindowsGreek = 0x0503,
    kCFStringEncodingWindowsLatin5 = 0x0504,
    kCFStringEncodingWindowsHebrew = 0x0505,
    kCFStringEncodingWindowsArabic = 0x0506,
    kCFStringEncodingWindowsBalticRim = 0x0507,
    kCFStringEncodingWindowsVietnamese = 0x0508,
    kCFStringEncodingWindowsKoreanJohab = 0x0510,
    kCFStringEncodingASCII = 0x0600,
    kCFStringEncodingANSEL = 0x0601,
    kCFStringEncodingJIS_X0201_76 = 0x0620,
    kCFStringEncodingJIS_X0208_83 = 0x0621,
    kCFStringEncodingJIS_X0208_90 = 0x0622,
    kCFStringEncodingJIS_X0212_90 = 0x0623,
    kCFStringEncodingJIS_C6226_78 = 0x0624,
    kCFStringEncodingShiftJIS_X0213 = 0x0628,
    kCFStringEncodingShiftJIS_X0213_MenKuTen = 0x0629,
    kCFStringEncodingGB_2312_80 = 0x0630,
    kCFStringEncodingGBK_95 = 0x0631,
    kCFStringEncodingGB_18030_2000 = 0x0632,
    kCFStringEncodingKSC_5601_87 = 0x0640,
    kCFStringEncodingKSC_5601_92_Johab = 0x0641,
    kCFStringEncodingCNS_11643_92_P1 = 0x0651,
    kCFStringEncodingCNS_11643_92_P2 = 0x0652,
    kCFStringEncodingCNS_11643_92_P3 = 0x0653,
    kCFStringEncodingISO_2022_JP = 0x0820,
    kCFStringEncodingISO_2022_JP_2 = 0x0821,
    kCFStringEncodingISO_2022_JP_1 = 0x0822,
    kCFStringEncodingISO_2022_JP_3 = 0x0823,
    kCFStringEncodingISO_2022_CN = 0x0830,
    kCFStringEncodingISO_2022_CN_EXT = 0x0831,
    kCFStringEncodingISO_2022_KR = 0x0840,
    kCFStringEncodingEUC_JP = 0x0920,
    kCFStringEncodingEUC_CN = 0x0930,
    kCFStringEncodingEUC_TW = 0x0931,
    kCFStringEncodingEUC_KR = 0x0940,
    kCFStringEncodingShiftJIS = 0x0A01,
    kCFStringEncodingKOI8_R = 0x0A02,
    kCFStringEncodingBig5 = 0x0A03,
    kCFStringEncodingMacRomanLatin1 = 0x0A04,
    kCFStringEncodingHZ_GB_2312 = 0x0A05,
    kCFStringEncodingBig5_HKSCS_1999 = 0x0A06,
    kCFStringEncodingVISCII = 0x0A07,
    kCFStringEncodingKOI8_U = 0x0A08,
    kCFStringEncodingBig5_E = 0x0A09,
    kCFStringEncodingNextStepLatin = 0x0B01,
    kCFStringEncodingNextStepJapanese = 0x0B02,
    kCFStringEncodingEBCDIC_US = 0x0C01,
    kCFStringEncodingEBCDIC_CP037 = 0x0C02,
    kCFStringEncodingUTF7 = 0x04000100,
    kCFStringEncodingUTF7_IMAP = 0x0A10,
    kCFStringEncodingShiftJIS_X0213_00 = 0x0628 /* Deprecated */
};

you can use it like this:

NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding (kCFStringEncodingGB_18030_2000);
    NSString *passStr = [[NSString alloc] initWithData:data encoding:enc];

// data is a GB2132编码