从NFC mifare标签iOS 13读取UID [英] Read UID from NFC mifare tag iOS 13

问题描述

我正在尝试读取mifare标签的UID.

I'm trying to read the UID for a mifare tag.

看例子，我经常看到以下方法:

Looking at examples, I see the following method a lot:

func tagReaderSession(_ session: NFCTagReaderSession, didDetect tags: [NFCTag]) {      
  if case let NFCTag.miFare(tag) = tags.first! {
    print(tag.identifier as NSData)
  }
}

但是，当将其放入我的项目时，不会调用该方法.

However when putting that into my project, the method is not called.

我还注意到xCode发出警告，该警告几乎匹配一个可选协议，该协议除了使用 NFCNDEFTag 而不是 NFCTag 之外，都是相同的..

I also noticed xCode giving a warning that this nearly matches an optional protocol which is the same except it uses NFCNDEFTag instead of NFCTag..

当我尝试更新时，该方法确实被调用.但是然后我在尝试将标签定义为该方法中的mifare时遇到了麻烦.我收到错误消息模式不能匹配'NFCNDEFTag'类型的值.

When I try update to that,that method does get called. But then I'm having trouble trying to define the tag as mifare inside that method. I get the error 'Pattern cannot match values of type 'NFCNDEFTag'.

以下代码:

    @available(iOS 13.0, *)
    func readerSession(_ session: NFCNDEFReaderSession, didDetect tags: [NFCNDEFTag]) {
        print("in did detect tags")

        let tag = tags.first!

        session.connect(to: tag) { (error: Error?) in


            session.connect(to: tag) { (error: Error?) in
                   if case let .mifare(mifareTag) = tag {
                       // can access tag identifier here?

                    }
            }
        }
    }

推荐答案

您初始化的会话应该是NFCTagReaderSession

Your session that you initialise should be a NFCTagReaderSession https://developer.apple.com/documentation/corenfc/nfctagreadersession

您应该遵守NFCTagReaderSessionDelegate https://developer.apple. com/documentation/corenfc/nfctagreadersessiondelegate?language = objc

And you should be conforming to NFCTagReaderSessionDelegate https://developer.apple.com/documentation/corenfc/nfctagreadersessiondelegate?language=objc

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