iOS 十六进制字符串与普通字符串转换

直接上代码 `+ (NSString *)hexStringFromString:(NSString *)string { NSData *myD = [string dataUsingEncoding:NSUTF8StringEncoding]; Byte *bytes = (Byte *)[myD bytes];

//下面是Byte 转换为16进制。
NSMutableString* resultStr = [[NSMutableString alloc]init];

for(int i=0;i<[myD length];i++)
 
{
    NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];///16进制数
     
    if([newHexStr length]==1)
    {
        newHexStr = [NSString stringWithFormat:@"0%@",newHexStr];
    }
    
    [resultStr appendString:newHexStr];
}

return resultStr;

}

// 十六进制转换为普通字符串的。

• (NSString *)stringFromHexString:(NSString *)hexString { if(hexString.length % 2 != 0) { return nil; } char *myBuffer = (char *)malloc((int)[hexString length] / 2 + 1); bzero(myBuffer, [hexString length] / 2 + 1); for (int i = 0; i < [hexString length] - 1; i += 2) { unsigned int anInt; NSString * hexCharStr = [hexString substringWithRange:NSMakeRange(i, 2)]; NSScanner * scanner = [[NSScanner alloc] initWithString:hexCharStr]; [scanner scanHexInt:&anInt]; myBuffer[i / 2] = (char)anInt; } NSString *unicodeString = [NSString stringWithCString:myBuffer encoding:NSUTF8StringEncoding]; return unicodeString;

// if (!hexString || [hexString length] == 0) { // return nil; // } // hexString = [hexString stringByReplacingOccurrencesOfString:@" " withString:@""]; // NSMutableData *hexData = [[NSMutableData alloc] initWithCapacity:8]; // NSRange range; // if ([hexString length] % 2 == 0) { // range = NSMakeRange(0, 2); // } else { // range = NSMakeRange(0, 1); // } // for (NSInteger i = range.location; i < [hexString length]; i += 2) { // unsigned int anInt; // NSString *hexCharStr = [hexString substringWithRange:range]; // NSScanner *scanner = [[NSScanner alloc] initWithString:hexCharStr]; // [scanner scanHexInt:&anInt]; // NSData entity = [[NSData alloc] initWithBytes:&anInt length:1]; // [hexData appendData:entity]; // range.location += range.length; // range.length = 2; // } // // NSString str = [[NSString alloc]initWithData:hexData encoding:NSUTF8StringEncoding]; // // return str; }

`