開(kāi)發(fā)語(yǔ)言：objective-c

問(wèn)題描述：

使用 wakdev 的 NFC工具-iOS即NFC Tools 讀取標(biāo)簽中自己寫入的 NDEF 數(shù)據(jù)，缺少"類型"說(shuō)明符和語(yǔ)言環(huán)境的使用情況

原代碼：

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]];
}

查資料看到一個(gè)答案，不過(guò)是用Swift寫的

var payloadData = Data([0x02,0x65,0x6E]) // 0x02 +'en'=區(qū)域說(shuō)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)

通過(guò)以下網(wǎng)站可查詢十六進(jìn)制碼對(duì)應(yīng)的字符：
ASCII碼表在線查詢
https://www.litefeel.com/tools/ascii.php

修改后的代碼

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]];
}

有不對(duì)的地方，還請(qǐng)大家指正