iOS NFC NDEF写入遇到的一个小问题

开发语言：objective-c

问题描述：

使用 wakdev 的 NFC工具-iOS即NFC Tools 读取标签中自己写入的 NDEF 数据，缺少"类型"说明符和语言环境的使用情况

原代码：

NSString *type = @"Q";
NSData *typeData = [type dataUsingEncoding:NSUTF8StringEncoding];
NSString *identifier = @"123456789";
NSData *identifierData = [identifier dataUsingEncoding:NSUTF8StringEncoding];
NSString *payload1 = @"Hello World!";
NSData *payloadData1 = [payload1 dataUsingEncoding:NSUTF8StringEncoding];

if (@available(iOS 13.0, *)) {
    NFCNDEFPayload *NDEFPayload1=[[NFCNDEFPayload alloc]initWithFormat:NFCTypeNameFormatNFCWellKnown type:typeData identifier:identifierData payload:payloadData1];
    NFCNDEFMessage *essage = [[NFCNDEFMessage alloc]initWithNDEFRecords:@[NDEFPayload1]];
}

查资料看到一个答案，不过是用Swift写的

var payloadData = Data([0x02,0x65,0x6E]) // 0x02 +'en'=区域说明符；0x7a,0x68 = 'zh'；0x65,0x6e = 'en'
payloadData.append("Text To Write".data(using: .utf8)!)
let payload = NFCNDEFPayload.init(
    format: NFCTypeNameFormat.nfcWellKnown,
    type: "T".data(using: .utf8)!,
    identifier: Data.init(count: 0),
    payload: payloadData,
    chunkSize: 0)

通过以下网站可查询十六进制码对应的字符：
ASCII码表在线查询
https://www.litefeel.com/tools/ascii.php

修改后的代码

NSString *type = @"Q";
NSData *typeData = [type dataUsingEncoding:NSUTF8StringEncoding];
NSString *identifier = @"123456789";
NSData *identifierData = [identifier dataUsingEncoding:NSUTF8StringEncoding];
NSString *payload1 = @"Hello World!";
NSData *payloadData1 = [payload1 dataUsingEncoding:NSUTF8StringEncoding];

Byte byte[] = {0x02,0x65,0x6E};
NSData *areaSpecifierData = [NSData dataWithBytes:byte length:3];

NSMutableData *payloadData = [[NSMutableData alloc] initWithData:areaSpecifierData];
[payloadData appendData:payloadData1];

if (@available(iOS 13.0, *)) {
    NFCNDEFPayload *NDEFPayload1 = [[NFCNDEFPayload alloc]initWithFormat:NFCTypeNameFormatNFCWellKnown type:typeData identifier:identifierData payload:payloadData];
    NFCNDEFMessage *essage = [[NFCNDEFMessage alloc]initWithNDEFRecords:@[NDEFPayload1]];
}

有不对的地方，还请大家指正