我需要将unicode中的NSString转换为ASCII中的NSString，更改所有本地字符： Ą到A， Ś到S， Ó到O， ü到你， 等等...
最简单的方法是什么？
答案 0 :(得分：42)
-[NSString dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]。
您提供的所有示例都可以根据需要进行处理。看起来像没有明显模拟的字符，例如☃，转到'？'。
答案 1 :(得分：7)
NSString *unicode = @"Chào mừng đến với Việt Nam.";
NSString *standard = [unicode stringByReplacingOccurrencesOfString:@"đ" withString:@"d"];
standard = [standard stringByReplacingOccurrencesOfString:@"Đ" withString:@"D"];
NSData *decode = [standard dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *ansi = [[NSString alloc] initWithData:decode encoding:NSASCIIStringEncoding];
NSLog(@"ANSI: %@", ansi);
答案 2 :(得分：2)
肯答案将“æ”替换为“ae”，将“ß”替换为“s”，但不会取代连字œ，ij，ff，fi，fl，ffi，ffl，ft，st，...
改进的解决方案是首先插入额外的映射行来处理所有问题：
string = [string stringByReplacingOccurrencesOfString:@"Œ" withString:@"OE"];
string = [string stringByReplacingOccurrencesOfString:@"œ" withString:@"oe"];
string = [string stringByReplacingOccurrencesOfString:@"Đ" withString:@"D"];
string = [string stringByReplacingOccurrencesOfString:@"đ" withString:@"d"];
string = [string precomposedStringWithCompatibilityMapping];
NSData *data = [string dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *newString = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
答案 3 :(得分：1)
Objective C的NSASCIIEncoding只支持127个，你在ASCII表中寻找的字符集超过127个。
NSASCIIStringEncoding 8位字符内严格的7位ASCII编码; ASCII值仅限0 ... 127。 适用于Mac OS X v10.0及更高版本。 在NSString.h中声明。
答案 4 :(得分：0)
NSData *data = [decode dataUsingEncoding:[NSString defaultCStringEncoding]];
decode = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
答案 5 :(得分：0)
NSUTF8StringEncoding和[NSSring UTF8String]在Xcode 12.2下对我不起作用
这是我自定义的NSString类别，适用于目标c中的所有ASCII值0..255
Header-fle
#import <Cocoa/Cocoa.h>
@interface NSString (ASCIIEncode)
- (const char*)ASCIIEncode;
@end
实施
#import "NSString+ASCIIEncode.h"
@implementation NSString (ASCIIEncode)
- (const char*)ASCIIEncode {
static char output[1024];
// https://tools.piex.at/ascii-tabelle/
// https://www.ionos.de/digitalguide/server/knowhow/ascii-american-standard-code-for-information-interchange/
NSMutableArray *ascii = [NSMutableArray new];
// Hex
// 000 Dez Hex
[ascii addObject:@"\0"]; // 000 000 NUL
[ascii addObject:@( 1)]; // 001 001 SOH
[ascii addObject:@( 2)]; // 002 002 STX
[ascii addObject:@( 3)]; // 003 003 ETX
[ascii addObject:@( 4)]; // 004 004 EOT
[ascii addObject:@( 5)]; // 005 005 ENQ
[ascii addObject:@( 6)]; // 006 006 ACK
[ascii addObject:@"\a"]; // 007 007 BEL
[ascii addObject:@"\b"]; // 008 008 BS
[ascii addObject:@( 9)]; // 009 009 TAB
[ascii addObject:@"\n"]; // 010 00A LF
[ascii addObject:@(11)]; // 011 00B VT
[ascii addObject:@(12)]; // 012 00C FF
[ascii addObject:@"\r"]; // 013 00D CR
[ascii addObject:@(14)]; // 014 00E SO
[ascii addObject:@(15)]; // 015 00F NAK
// 010
[ascii addObject:@(16)]; // 016 010 DLE
[ascii addObject:@(17)]; // 017 011 DC1
[ascii addObject:@(18)]; // 018 012 DC2
[ascii addObject:@(19)]; // 019 013 DC3
[ascii addObject:@(20)]; // 020 014 DC4
[ascii addObject:@(21)]; // 021 015 NAK
[ascii addObject:@(22)]; // 022 016 SYN
[ascii addObject:@(23)]; // 023 017 ETB
[ascii addObject:@(24)]; // 024 018 CAN
[ascii addObject:@(25)]; // 025 019 EM
[ascii addObject:@(26)]; // 026 01A SUB
[ascii addObject:@(27)]; // 027 01B ESC
[ascii addObject:@(28)]; // 028 01C FS
[ascii addObject:@(29)]; // 029 01D GS
[ascii addObject:@(30)]; // 030 01E RS
[ascii addObject:@(31)]; // 031 01F US
// 020
[ascii addObject:@" "]; // 032 020 Space
[ascii addObject:@"!"]; // 033 021
[ascii addObject:@"\""]; // 034 022
[ascii addObject:@"#"]; // 035 023
[ascii addObject:@"$"]; // 036 024
[ascii addObject:@"%"]; // 037 025
[ascii addObject:@"&"]; // 038 026
[ascii addObject:@"'"]; // 039 027
[ascii addObject:@"("]; // 040 028
[ascii addObject:@")"]; // 041 029
[ascii addObject:@"*"]; // 042 02A
[ascii addObject:@"+"]; // 043 02B
[ascii addObject:@","]; // 044 02C
[ascii addObject:@"-"]; // 045 02D
[ascii addObject:@"."]; // 046 02E
[ascii addObject:@"/"]; // 047 02F
// 030
[ascii addObject:@"0"]; // 048 030
[ascii addObject:@"1"]; // 049 031
[ascii addObject:@"2"]; // 050 032
[ascii addObject:@"3"]; // 051 033
[ascii addObject:@"4"]; // 052 034
[ascii addObject:@"5"]; // 053 035
[ascii addObject:@"6"]; // 054 036
[ascii addObject:@"7"]; // 055 037
[ascii addObject:@"8"]; // 056 038
[ascii addObject:@"9"]; // 057 039
[ascii addObject:@":"]; // 058 03A
[ascii addObject:@";"]; // 059 03B
[ascii addObject:@"<"]; // 060 03C
[ascii addObject:@"="]; // 061 03D
[ascii addObject:@">"]; // 062 03E
[ascii addObject:@"?"]; // 063 03F
// 040
[ascii addObject:@"@"]; // 064 040
[ascii addObject:@"A"]; // 065 041
[ascii addObject:@"B"]; // 066 042
[ascii addObject:@"C"]; // 067 043
[ascii addObject:@"D"]; // 068 044
[ascii addObject:@"E"]; // 069 045
[ascii addObject:@"F"]; // 070 046
[ascii addObject:@"G"]; // 071 047
[ascii addObject:@"H"]; // 072 048
[ascii addObject:@"I"]; // 073 049
[ascii addObject:@"J"]; // 074 04A
[ascii addObject:@"K"]; // 075 04B
[ascii addObject:@"L"]; // 076 04C
[ascii addObject:@"M"]; // 077 04D
[ascii addObject:@"N"]; // 078 04E
[ascii addObject:@"O"]; // 079 04F
// 050
[ascii addObject:@"P"]; // 080 050
[ascii addObject:@"Q"]; // 081 051
[ascii addObject:@"R"]; // 082 052
[ascii addObject:@"S"]; // 083 053
[ascii addObject:@"T"]; // 084 054
[ascii addObject:@"U"]; // 085 055
[ascii addObject:@"V"]; // 086 056
[ascii addObject:@"W"]; // 087 057
[ascii addObject:@"X"]; // 088 058
[ascii addObject:@"Y"]; // 089 059
[ascii addObject:@"Z"]; // 090 05A
[ascii addObject:@"["]; // 091 05B
[ascii addObject:@"\\"]; // 092 05C
[ascii addObject:@"]"]; // 093 05D
[ascii addObject:@"^"]; // 094 05E
[ascii addObject:@"_"]; // 095 05F
// 060
[ascii addObject:@"`"]; // 096 060
[ascii addObject:@"a"]; // 097 061
[ascii addObject:@"b"]; // 098 062
[ascii addObject:@"c"]; // 099 063
[ascii addObject:@"d"]; // 100 064
[ascii addObject:@"e"]; // 101 065
[ascii addObject:@"f"]; // 102 066
[ascii addObject:@"g"]; // 103 067
[ascii addObject:@"h"]; // 104 068
[ascii addObject:@"i"]; // 105 069
[ascii addObject:@"j"]; // 106 06A
[ascii addObject:@"k"]; // 107 06B
[ascii addObject:@"l"]; // 108 06C
[ascii addObject:@"m"]; // 109 06D
[ascii addObject:@"n"]; // 110 06E
[ascii addObject:@"o"]; // 111 06F
// 070
[ascii addObject:@"p"]; // 112 070
[ascii addObject:@"q"]; // 113 071
[ascii addObject:@"r"]; // 114 072
[ascii addObject:@"s"]; // 115 073
[ascii addObject:@"t"]; // 116 074
[ascii addObject:@"u"]; // 117 075
[ascii addObject:@"v"]; // 118 076
[ascii addObject:@"w"]; // 119 077
[ascii addObject:@"x"]; // 120 078
[ascii addObject:@"y"]; // 121 079
[ascii addObject:@"z"]; // 122 07A
[ascii addObject:@"{"]; // 123 07B
[ascii addObject:@"|"]; // 124 07C
[ascii addObject:@"}"]; // 125 07D
[ascii addObject:@"~"]; // 126 07E
[ascii addObject:@(127)];// 127 07F DEL
// 080
[ascii addObject:@"€"]; // 128 080
[ascii addObject:@(129)];// 129 081
[ascii addObject:@"‚"]; // 130 082
[ascii addObject:@"ƒ"]; // 131 083
[ascii addObject:@"„"]; // 132 084
[ascii addObject:@"…"]; // 133 085
[ascii addObject:@"†"]; // 134 086
[ascii addObject:@"‡"]; // 135 087
[ascii addObject:@"ˆ"]; // 136 088
[ascii addObject:@"‰"]; // 137 089
[ascii addObject:@"Š"]; // 138 08A
[ascii addObject:@"‹"]; // 139 08B
[ascii addObject:@"Œ"]; // 140 08C
[ascii addObject:@(141)];// 141 08D
[ascii addObject:@"Ž"]; // 142 08E
[ascii addObject:@(143)]; // 143 08F
// 090
[ascii addObject:@(144)];// 144 090
[ascii addObject:@"‘"]; // 145 091
[ascii addObject:@"’"]; // 146 092
[ascii addObject:@"“"]; // 147 093
[ascii addObject:@"”"]; // 148 094
[ascii addObject:@"•"]; // 149 095
[ascii addObject:@"–"]; // 150 096
[ascii addObject:@"—"]; // 151 097
[ascii addObject:@"˜"]; // 152 098
[ascii addObject:@"™"]; // 153 099
[ascii addObject:@"š"]; // 154 09A
[ascii addObject:@"›"]; // 155 09B
[ascii addObject:@"œ"]; // 156 09C
[ascii addObject:@(157)];// 157 09D
[ascii addObject:@"ž"]; // 158 09E
[ascii addObject:@"Ÿ"]; // 159 09F
// 0A0
[ascii addObject:@(160)];// 160 0A0
[ascii addObject:@"¡"]; // 161 0A1
[ascii addObject:@"¢"]; // 162 0A2
[ascii addObject:@"£"]; // 163 0A3
[ascii addObject:@"¤"]; // 164 0A4
[ascii addObject:@"¥"]; // 165 0A5
[ascii addObject:@"¦"]; // 166 0A6
[ascii addObject:@"§"]; // 167 0A7
[ascii addObject:@"¨"]; // 168 0A8
[ascii addObject:@"©"]; // 169 0A9
[ascii addObject:@"ª"]; // 170 0AA
[ascii addObject:@"«"]; // 171 0AB
[ascii addObject:@"¬"]; // 172 0AC
[ascii addObject:@(173)];// 173 0AD
[ascii addObject:@"®"]; // 174 0AE
[ascii addObject:@"¯"]; // 175 0AF
// 0B0
[ascii addObject:@"°"]; // 176 0B0
[ascii addObject:@"±"]; // 177 0B1
[ascii addObject:@"²"]; // 178 0B2
[ascii addObject:@"³"]; // 179 0B3
[ascii addObject:@"´"]; // 180 0B4
[ascii addObject:@"µ"]; // 181 0B5
[ascii addObject:@"¶"]; // 182 0B6
[ascii addObject:@"·"]; // 183 0B7
[ascii addObject:@"¸"]; // 184 0B8
[ascii addObject:@"¹"]; // 185 0B9
[ascii addObject:@"º"]; // 186 0BA
[ascii addObject:@"»"]; // 187 0BB
[ascii addObject:@"¼"]; // 188 0BC
[ascii addObject:@"½"]; // 189 0BD
[ascii addObject:@"¾"]; // 190 0BE
[ascii addObject:@"¿"]; // 191 0BF
// 0C0
[ascii addObject:@"À"]; // 192 0C0
[ascii addObject:@"Á"]; // 193 0C1
[ascii addObject:@"Â"]; // 194 0C2
[ascii addObject:@"Ã"]; // 195 0C3
[ascii addObject:@"Ä"]; // 196 0C4
[ascii addObject:@"Å"]; // 197 0C5
[ascii addObject:@"Æ"]; // 198 0C6
[ascii addObject:@"Ç"]; // 199 0C7
[ascii addObject:@"È"]; // 200 0C8
[ascii addObject:@"É"]; // 201 0C9
[ascii addObject:@"Ê"]; // 202 0CA
[ascii addObject:@"Ë"]; // 203 0CB
[ascii addObject:@"Ì"]; // 204 0CC
[ascii addObject:@"Í"]; // 205 0CD
[ascii addObject:@"Î"]; // 206 0CE
[ascii addObject:@"Ï"]; // 207 0CF
// 0D0
[ascii addObject:@"Ð"]; // 208 0D0
[ascii addObject:@"Ñ"]; // 209 0D1
[ascii addObject:@"Ò"]; // 210 0D2
[ascii addObject:@"Ó"]; // 211 0D3
[ascii addObject:@"Ô"]; // 212 0D4
[ascii addObject:@"Õ"]; // 213 0D5
[ascii addObject:@"Ö"]; // 214 0D6
[ascii addObject:@"×"]; // 215 0D7
[ascii addObject:@"Ø"]; // 216 0D8
[ascii addObject:@"Ù"]; // 217 0D9
[ascii addObject:@"Ú"]; // 218 0DA
[ascii addObject:@"Û"]; // 219 0DB
[ascii addObject:@"Ü"]; // 220 0DC
[ascii addObject:@"Ý"]; // 221 0DD
[ascii addObject:@"Þ"]; // 222 0DE
[ascii addObject:@"ß"]; // 223 0DF
// 0E0
[ascii addObject:@"à"]; // 224 0E0
[ascii addObject:@"á"]; // 225 0E1
[ascii addObject:@"â"]; // 226 0E2
[ascii addObject:@"ã"]; // 227 0E3
[ascii addObject:@"ä"]; // 228 0E4
[ascii addObject:@"å"]; // 229 0E5
[ascii addObject:@"æ"]; // 230 0E6
[ascii addObject:@"ç"]; // 231 0E7
[ascii addObject:@"è"]; // 232 0E8
[ascii addObject:@"é"]; // 233 0E9
[ascii addObject:@"ê"]; // 234 0EA
[ascii addObject:@"ë"]; // 235 0EB
[ascii addObject:@"ì"]; // 236 0EC
[ascii addObject:@"í"]; // 237 0ED
[ascii addObject:@"î"]; // 238 0EE
[ascii addObject:@"ï"]; // 239 0EF
// 0F0
[ascii addObject:@"ð"]; // 240 0F0
[ascii addObject:@"ñ"]; // 241 0F1
[ascii addObject:@"ò"]; // 242 0F2
[ascii addObject:@"ó"]; // 243 0F3
[ascii addObject:@"ô"]; // 244 0F4
[ascii addObject:@"õ"]; // 245 0F5
[ascii addObject:@"ö"]; // 246 0F6
[ascii addObject:@"÷"]; // 247 0F7
[ascii addObject:@"ø"]; // 248 0F8
[ascii addObject:@"ù"]; // 249 0F9
[ascii addObject:@"ú"]; // 250 0FA
[ascii addObject:@"û"]; // 251 0FB
[ascii addObject:@"ü"]; // 252 0FC
[ascii addObject:@"ý"]; // 253 0FD
[ascii addObject:@"þ"]; // 254 0FE
[ascii addObject:@"ÿ"]; // 255 0FF
NSInteger i;
for (i=0; i < self.length; i++) {
NSRange range;
range.location = i;
range.length = 1;
NSString *charString = [self substringWithRange:range];
for (NSInteger asciiIdx=0; asciiIdx < ascii.count; asciiIdx++) {
if ([charString isEqualToString:ascii[asciiIdx]]) {
unsigned char c = (unsigned char)asciiIdx;
output[i] = c;
break;
}
}
}
// Don't forget string termination
output[i] = 0;
return (const char*)&output[0];
}
@end