Question

ios 16进制如何表示

Answer 1

指将前面的'ios'三个字符转为ASCII十六进制码？

‘ios' >> 0x696F73

Answer 2

关于中文16进制再转中文，一般使用这种方式：
NSData *nsdataUTF16 = [str dataUsingEncoding:NSUTF16LittleEndianStringEncoding];//转HEX

NSString* newStr = [[NSString alloc] initWithData: nsdataUTF16 encoding:NSUTF16LittleEndianStringEncoding];//转回字符

NSString *command = @"72ff63cea198b3edba8f7e0c23acc345050187a0cde5a9872cbab091ab73e553";
command = [command stringByReplacingOccurrencesOfString:@" " withString:@""];
NSMutableData *commandToSend= [[NSMutableData alloc] init];
unsigned char whole_byte;
char byte_chars[3] = {'\0','\0','\0'};
int i;
for (i=0; i < [command length]/2; i++) {
byte_chars[0] = [command characterAtIndex:i*2];
byte_chars[1] = [command characterAtIndex:i*2+1];
whole_byte = strtol(byte_chars, NULL, 16);
[commandToSend appendBytes:&whole_byte length:1];
}
NSLog(@"%@", commandToSend);