ios 16进制的NSData转化16进制的字符串

NSMutableString *string = [[NSMutableString alloc] initWithCapacity:[data length]];

[data enumerateByteRangesUsingBlock:^(const void *bytes, NSRange byteRange, BOOL *stop) {

unsigned char *dataBytes = (unsigned char*)bytes;

for (NSInteger i = 0; i < byteRange.length; i++) {

NSString *hexStr = [NSString stringWithFormat:@"%x", (dataBytes[i]) & 0xff];

if ([hexStr length] == 2) {

[string appendString:hexStr];

} else {

[string appendFormat:@"0%@", hexStr];

}

}

}];

NSLog(@"转化的16进制%@",string);