NSString 的非utf-8编码（gbk，gb18030）
雍兴修
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博文原创，转载请声明出处
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ios系统盒max os系统默认是utf-8编码的，有时候我们获得的资源是gbk的，因此需要将字符串进行转码。代码如下：
unsigned long encode = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
NSString* str = @"张三"; //这里是你的gbk编码string
NSData *responseData =[str dataUsingEncoding:NSUTF8StringEncoding ];
NSString *str_gb18030 = [[NSString alloc] initWithData:responseData encoding:encode];
NSLog(@"str_gb18030=%@", str_gb18030);另附上ios支持的所有编码：
{
/* kCFStringEncodingMacRoman = 0L, defined in CoreFoundation/CFString.h */
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,
/* The following use script code 0, smRoman */
kCFStringEncodingMacSymbol = 33,
kCFStringEncodingMacDingbats = 34,
kCFStringEncodingMacTurkish = 35,
kCFStringEncodingMacCroatian = 36,
kCFStringEncodingMacIcelandic = 37,
kCFStringEncodingMacRomanian = 38,
kCFStringEncodingMacCeltic = 39,
kCFStringEncodingMacGaelic = 40,
/* The following use script code 4, smArabic */
kCFStringEncodingMacFarsi = 0x8C, /* Like MacArabic but uses Farsi digits */
/* The following use script code 7, smCyrillic */
kCFStringEncodingMacUkrainian = 0x98,
/* The following use script code 32, smUnimplemented */
kCFStringEncodingMacInuit = 0xEC,
kCFStringEncodingMacVT100 = 0xFC, /* VT100/102 font from Comm Toolbox: Latin-1 repertoire + box drawing etc */
/* Special Mac OS encodings*/
kCFStringEncodingMacHFS = 0xFF, /* Meta-value, should never appear in a table */
/* Unicode & ISO UCS encodings begin at 0x100 */
/* We don't use Unicode variations defined in TextEncoding; use the ones in CFString.h, instead. */
/* ISO 8-bit and 7-bit encodings begin at 0x200 */
/* kCFStringEncodingISOLatin1 = 0x0201, defined in CoreFoundation/CFString.h */
kCFStringEncodingISOLatin2 = 0x0202, /* ISO 8859-2 */
kCFStringEncodingISOLatin3 = 0x0203, /* ISO 8859-3 */
kCFStringEncodingISOLatin4 = 0x0204, /* ISO 8859-4 */
kCFStringEncodingISOLatinCyrillic = 0x0205, /* ISO 8859-5 */
kCFStringEncodingISOLatinArabic = 0x0206, /* ISO 8859-6, =ASMO 708, =DOS CP 708 */
kCFStringEncodingISOLatinGreek = 0x0207, /* ISO 8859-7 */
kCFStringEncodingISOLatinHebrew = 0x0208, /* ISO 8859-8 */
kCFStringEncodingISOLatin5 = 0x0209, /* ISO 8859-9 */
kCFStringEncodingISOLatin6 = 0x020A, /* ISO 8859-10 */
kCFStringEncodingISOLatinThai = 0x020B, /* ISO 8859-11 */
kCFStringEncodingISOLatin7 = 0x020D, /* ISO 8859-13 */
kCFStringEncodingISOLatin8 = 0x020E, /* ISO 8859-14 */
kCFStringEncodingISOLatin9 = 0x020F, /* ISO 8859-15 */
kCFStringEncodingISOLatin10 = 0x0210, /* ISO 8859-16 */
/* MS-DOS & Windows encodings begin at 0x400 */
kCFStringEncodingDOSLatinUS = 0x0400, /* code page 437 */
kCFStringEncodingDOSGreek = 0x0405, /* code page 737 (formerly code page 437G) */
kCFStringEncodingDOSBalticRim = 0x0406, /* code page 775 */
kCFStringEncodingDOSLatin1 = 0x0410, /* code page 850, "Multilingual" */
kCFStringEncodingDOSGreek1 = 0x0411, /* code page 851 */
kCFStringEncodingDOSLatin2 = 0x0412, /* code page 852, Slavic */
kCFStringEncodingDOSCyrillic = 0x0413, /* code page 855, IBM Cyrillic */
kCFStringEncodingDOSTurkish = 0x0414, /* code page 857, IBM Turkish */
kCFStringEncodingDOSPortuguese = 0x0415, /* code page 860 */
kCFStringEncodingDOSIcelandic = 0x0416, /* code page 861 */
kCFStringEncodingDOSHebrew = 0x0417, /* code page 862 */
kCFStringEncodingDOSCanadianFrench = 0x0418, /* code page 863 */
kCFStringEncodingDOSArabic = 0x0419, /* code page 864 */
kCFStringEncodingDOSNordic = 0x041A, /* code page 865 */
kCFStringEncodingDOSRussian = 0x041B, /* code page 866 */
kCFStringEncodingDOSGreek2 = 0x041C, /* code page 869, IBM Modern Greek */
kCFStringEncodingDOSThai = 0x041D, /* code page 874, also for Windows */
kCFStringEncodingDOSJapanese = 0x0420, /* code page 932, also for Windows */
kCFStringEncodingDOSChineseSimplif = 0x0421, /* code page 936, also for Windows */
kCFStringEncodingDOSKorean = 0x0422, /* code page 949, also for Windows; Unified Hangul Code */
kCFStringEncodingDOSChineseTrad = 0x0423, /* code page 950, also for Windows */
/* kCFStringEncodingWindowsLatin1 = 0x0500, defined in CoreFoundation/CFString.h */
kCFStringEncodingWindowsLatin2 = 0x0501, /* code page 1250, Central Europe */
kCFStringEncodingWindowsCyrillic = 0x0502, /* code page 1251, Slavic Cyrillic */
kCFStringEncodingWindowsGreek = 0x0503, /* code page 1253 */
kCFStringEncodingWindowsLatin5 = 0x0504, /* code page 1254, Turkish */
kCFStringEncodingWindowsHebrew = 0x0505, /* code page 1255 */
kCFStringEncodingWindowsArabic = 0x0506, /* code page 1256 */
kCFStringEncodingWindowsBalticRim = 0x0507, /* code page 1257 */
kCFStringEncodingWindowsVietnamese = 0x0508, /* code page 1258 */
kCFStringEncodingWindowsKoreanJohab = 0x0510, /* code page 1361, for Windows NT */
/* Various national standards begin at 0x600 */
/* kCFStringEncodingASCII = 0x0600, defined in CoreFoundation/CFString.h */
kCFStringEncodingANSEL = 0x0601, /* ANSEL (ANSI Z39.47) */
kCFStringEncodingJIS_X0201_76 = 0x0620,
kCFStringEncodingJIS_X0208_83 = 0x0621,
kCFStringEncodingJIS_X0208_90 = 0x0622,
kCFStringEncodingJIS_X0212_90 = 0x0623,
kCFStringEncodingJIS_C6226_78 = 0x0624,
kCFStringEncodingShiftJIS_X0213 CF_ENUM_AVAILABLE(10_5, 2_0) = 0x0628, /* Shift-JIS format encoding of JIS X0213 planes 1 and 2*/
kCFStringEncodingShiftJIS_X0213_MenKuTen = 0x0629, /* JIS X0213 in plane-row-column notation */
kCFStringEncodingGB_2312_80 = 0x0630,
kCFStringEncodingGBK_95 = 0x0631, /* annex to GB 13000-93; for Windows 95 */
kCFStringEncodingGB_18030_2000 = 0x0632,
kCFStringEncodingKSC_5601_87 = 0x0640, /* same as KSC 5601-92 without Johab annex */
kCFStringEncodingKSC_5601_92_Johab = 0x0641, /* KSC 5601-92 Johab annex */
kCFStringEncodingCNS_11643_92_P1 = 0x0651, /* CNS 11643-1992 plane 1 */
kCFStringEncodingCNS_11643_92_P2 = 0x0652, /* CNS 11643-1992 plane 2 */
kCFStringEncodingCNS_11643_92_P3 = 0x0653, /* CNS 11643-1992 plane 3 (was plane 14 in 1986 version) */
/* ISO 2022 collections begin at 0x800 */
kCFStringEncodingISO_2022_JP = 0x0820,
kCFStringEncodingISO_2022_JP_2 = 0x0821,
kCFStringEncodingISO_2022_JP_1 = 0x0822, /* RFC 2237*/
kCFStringEncodingISO_2022_JP_3 = 0x0823, /* JIS X0213*/
kCFStringEncodingISO_2022_CN = 0x0830,
kCFStringEncodingISO_2022_CN_EXT = 0x0831,
kCFStringEncodingISO_2022_KR = 0x0840,
/* EUC collections begin at 0x900 */
kCFStringEncodingEUC_JP = 0x0920, /* ISO 646, 1-byte katakana, JIS 208, JIS 212 */
kCFStringEncodingEUC_CN = 0x0930, /* ISO 646, GB 2312-80 */
kCFStringEncodingEUC_TW = 0x0931, /* ISO 646, CNS 11643-1992 Planes 1-16 */
kCFStringEncodingEUC_KR = 0x0940, /* ISO 646, KS C 5601-1987 */
/* Misc standards begin at 0xA00 */
kCFStringEncodingShiftJIS = 0x0A01, /* plain Shift-JIS */
kCFStringEncodingKOI8_R = 0x0A02, /* Russian internet standard */
kCFStringEncodingBig5 = 0x0A03, /* Big-5 (has variants) */
kCFStringEncodingMacRomanLatin1 = 0x0A04, /* Mac OS Roman permuted to align with ISO Latin-1 */
kCFStringEncodingHZ_GB_2312 = 0x0A05, /* HZ (RFC 1842, for Chinese mail & news) */
kCFStringEncodingBig5_HKSCS_1999 = 0x0A06, /* Big-5 with Hong Kong special char set supplement*/
kCFStringEncodingVISCII = 0x0A07, /* RFC 1456, Vietnamese */
kCFStringEncodingKOI8_U = 0x0A08, /* RFC 2319, Ukrainian */
kCFStringEncodingBig5_E = 0x0A09, /* Taiwan Big-5E standard */
/* Other platform encodings*/
/* kCFStringEncodingNextStepLatin = 0x0B01, defined in CoreFoundation/CFString.h */
kCFStringEncodingNextStepJapanese = 0x0B02, /* NextStep Japanese encoding */
/* EBCDIC & IBM host encodings begin at 0xC00 */
kCFStringEncodingEBCDIC_US = 0x0C01, /* basic EBCDIC-US */
kCFStringEncodingEBCDIC_CP037 = 0x0C02, /* code page 037, extended EBCDIC (Latin-1 set) for US,Canada... */
kCFStringEncodingUTF7 CF_ENUM_AVAILABLE(10_6, 4_0) = 0x04000100, /* kTextEncodingUnicodeDefault + kUnicodeUTF7Format RFC2152 */
kCFStringEncodingUTF7_IMAP CF_ENUM_AVAILABLE(10_6, 4_0) = 0x0A10, /* UTF-7 (IMAP folder variant) RFC3501 */
/* Deprecated constants */
kCFStringEncodingShiftJIS_X0213_00 = 0x0628 /* Shift-JIS format encoding of JIS X0213 planes 1 and 2 (DEPRECATED) */
}
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