用swift讀寫NTag

1. 在info.plist中，加入Privacy - NFC Scan Usage Description
2. 在Capabilities 加入Near Field Communication Tag Reading
   
3. 掃描

   func startScan() {

           let session = NFCNDEFReaderSession(delegate: self, queue: nil, invalidateAfterFirstRead: false)

           session.alertMessage = "Hold your iPhone near an NFC transit card."

           session.begin()

   }

4. 連線，更新payload

   func readerSession(_ session: NFCNDEFReaderSession, didDetect tags: [NFCNDEFTag]) {

       guard

           let sms = "場所代碼：111111111111111 本次實聯簡訊限防疫目的使用。".addingPercentEncoding(withAllowedCharacters: .urlHostAllowed),

           let payload = NFCNDEFPayload.wellKnownTypeURIPayload(string: "sms:1922&body=\(sms)"),

           let tag = tags.first

       else {

           session.invalidate(errorMessage: "Could not process tag.")

           return

       }

       session.connect(to: tag) { error in

           guard error == nil else {

               session.invalidate(errorMessage: "Could not connect to tag.")

               return

           }

           tag.queryNDEFStatus { status, capacity, error in

               guard error == nil else {

                   session.invalidate(errorMessage: "Could not query status of tag.")

                   return

               }

               

               switch status {

               case .notSupported:

                   session.invalidate(errorMessage: "Tag is not supported.")

               case .readOnly:

                   session.invalidate(errorMessage: "Tag is only readable.")

               case .readWrite:

                   let messge = NFCNDEFMessage.init(records: [payload])

                   tag.writeNDEF(messge) { error in

                       if error != nil {

                           session.invalidate(errorMessage: "Failed to write message.")

                       } else {

                           session.alertMessage = "Successfully configured tag."

                           session.invalidate()

                       }

                   }

                   

               @unknown default:   session.invalidate(errorMessage: "Unknown status of tag.")

               }

           }

       }

   }

PS.找不到 Near Field Communication Tag Reading ，請切換開發者帳號到付費帳號