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ios基本编码格式转换UTF8
iOS中编码转化
1.UTF-8转化
NSString *data =http://www.mamicode.com/ @"你好，北京！";
//转换成UTF-8
NSString *dataUTF8 = [data stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"%@",dataUTF8);
//UTF-8转GBK,将UTF8代码替换，官方解释如下。
//Replaces all percent escapes with the matching characters as determined by the given encoding. Returns nil if the transformation is not possible (i.e. the percent escapes give a byte sequence not legal in the given encoding). See CFURLCreateStringByReplacingPercentEscapes in CFURL.h for more complex transformations
NSString *dataGBK = [dataUTF8 stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"%@",dataGBK);
在Xcode4.2中执行结果如下：
将上述方法封装，如下：
1 //Unicode转UTF-8 2 3 4 5 + (NSString *)encodeToPercentEscapeString: (NSString *) input 6 7 { 8 9 // Encode all the reserved characters, per RFC 3986 10 11 // (<http://www.ietf.org/rfc/rfc3986.txt>) 12 13 NSString *outputStr = (NSString *) 14 15 CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, 16 17 (CFStringRef)input, 18 19 NULL, 20 21 (CFStringRef)@"!*‘();:@&=+$,/?%#[]", 22 23 kCFStringEncodingUTF8); 24 25 return outputStr; 26 27 } 28 29 30 31 + (NSString *)decodeFromPercentEscapeString: (NSString *) input 32 33 { 34 35 NSMutableString *outputStr = [NSMutableString stringWithString:input]; 36 37 [outputStr replaceOccurrencesOfString:@"+" 38 39 withString:@" " 40 41 options:NSLiteralSearch 42 43 range:NSMakeRange(0, [outputStr length])]; 44 45 46 47 return [outputStr stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; 48 49 }
2.UTF-8和Unicode转化
1 //Unicode转UTF-8 2 3 + (NSString*) replaceUnicode:(NSString*)aUnicodeString 4 5 { 6 7 NSString *tempStr1 = [aUnicodeString stringByReplacingOccurrencesOfString:@"\\u" withString:@"\\U"]; 8 9 NSString *tempStr2 = [tempStr1 stringByReplacingOccurrencesOfString:@"\"" withString:@"\\\""]; 10 11 NSString *tempStr3 = [[@"\"" stringByAppendingString:tempStr2] stringByAppendingString:@"\""]; 12 13 NSData *tempData =http://www.mamicode.com/ [tempStr3 dataUsingEncoding:NSUTF8StringEncoding]; 14 15 NSString* returnStr = [NSPropertyListSerialization propertyListFromData:tempData 16 17 mutabilityOption:NSPropertyListImmutable 18 19 format:NULL 20 21 errorDescription:NULL]; 22 23 24 25 return [returnStr stringByReplacingOccurrencesOfString:@"\\r\\n" withString:@"\n"]; 26 27 }28 29 30 31 32 33 +(NSString *) utf8ToUnicode:(NSString *)string34 35 {36 37 NSUInteger length = [string length];38 39 NSMutableString *s = [NSMutableString stringWithCapacity:0];40 41 for (int i = 0;i < length; i++) 42 43 {44 45 unichar _char = [string characterAtIndex:i];46 47 //判断是否为英文和数字48 49 if (_char <= ‘9‘ && _char >= ‘0‘) 50 51 {52 53 [s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i, 1)]];54 55 }56 57 else if(_char >= ‘a‘ && _char <= ‘z‘)58 59 {60 61 [s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i, 1)]];62 63 64 65 }66 67 else if(_char >= ‘A‘ && _char <= ‘Z‘)68 69 {70 71 [s appendFormat:@"%@",[string substringWithRange:NSMakeRange(i, 1)]];72 73 75 }76 77 else78 79 {80 81 [s appendFormat:@"\\u%x",[string characterAtIndex:i]];82 83 }84 85 }86 87 return s;88 89 }
ios基本编码格式转换UTF8