最近在完成一個需求時，遇到了NSData類型轉換為十六進制的字符串這個需求的函數(shù)，在stackoverflow中翻找的時候，給出的答案基本上是如下的:

NSString* newStr = [[NSString alloc] initWithData:theData encoding:NSUTF8StringEncoding];

// If the data is null-terminated, you should instead use -stringWithUTF8String: to avoid the extra \0 at the end.

NSString* newStr = [NSString stringWithUTF8String:[theData bytes]];

// (Note that if the input is not properly UTF-8-encoded, you will get nil.)

Swift的寫法

let newStr = String(data: data, encoding: .utf8)
// note that `newStr` is a `String?`, not a `String`.
// If the data is null-terminated, you could go though the safe way which is remove the that null character, or the unsafe way similar to the Objective-C version above.

// safe way, provided data is \0-terminated
let newStr1 = String(data: data.subdata(in: 0 ..< data.count - 1), encoding: .utf8)
// unsafe way, provided data is \0-terminated
let newStr2 = data.withUnsafeBytes(String.init(utf8String:))

但是在實際的測試中，并不能完成將NSData轉換為NSData中存儲的十六進制字符串的功能，所以在最終找到答案之后，決定記錄下來，以便下次使用可以快速查找。

- (NSData *)convertHexStrToData:(NSString *)str {
    if (!str || [str length] == 0) {
        return nil;
    }
    
    NSMutableData *hexData = [[NSMutableData alloc] initWithCapacity:8];
    NSRange range;
    if ([str length] % 2 == 0) {
        range = NSMakeRange(0, 2);
    } else {
        range = NSMakeRange(0, 1);
    }
    for (NSInteger i = range.location; i < [str length]; i += 2) {
        unsigned int anInt;
        NSString *hexCharStr = [str 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;
    }
    
    NSLog(@"hexdata: %@", hexData);
    return hexData;
}

傳入?yún)?shù)字符串@"400"時，打印出來的是 hexdata: <0400>。十六進制的400就是10進制的1024。

- (NSString *)convertDataToHexStr:(NSData *)data {
    if (!data || [data length] == 0) {
        return @"";
    }
    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];
            }
        }
    }];
    
    return string;
}

將上一個??的NSData作為參數(shù)傳入時，返回的字符串為400。轉換完成。