Guys, I need your help, please.
What do I need: to get the tag's UID using iOS app What do I have: I have an app Flutter, which works fine on Android (I can read the tag's UID) and do nothing on iOS
Details: I have this type of cards (plastic card) card's data, Mifare Classis 1k
As you can see, this is the Mifare Classic 1k card with payload "My text with spaces"
I used flutter channels to communicate between flutter and iOS native (swift)
On iOS side I created two implementations: one for NFCTagReaderSession, another one for NFCNDEFReaderSession (I do not use it at the same time, only separated)
1. NFCTagReaderSession implementation
import UIKit
import Flutter
import CoreNFC
@available(iOS 13.0, *)
var session_tag: NFCTagReaderSession?
@available(iOS 13.0, *)
var flutterResult: FlutterResult!
@available(iOS 13.0, *)
@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate, NFCTagReaderSessionDelegate {
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
let nfcChannel = FlutterMethodChannel(name: "samples.flutter.dev/nfc", binaryMessenger: controller.binaryMessenger)
nfcChannel.setMethodCallHandler({
[weak self] (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
// Note: this method is invoked on the UI thread.
guard call.method == "getNFCTag" else {
result(FlutterMethodNotImplemented)
return
}
if NFCTagReaderSession.readingAvailable {
print("we are ready for reading");
self?.startReadingNFC(result: result)
} else {
print("sorry byt not working");
}
})
GeneratedPluginRegistrant.register(with: self)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
private func startReadingNFC(result: @escaping FlutterResult) {
flutterResult = result
session_tag = NFCTagReaderSession(pollingOption: .iso14443, delegate: self, queue: DispatchQueue.main)
session_tag?.alertMessage = "Hold ur phone!"
session_tag?.begin()
}
func tagReaderSessionDidBecomeActive(_ session: NFCTagReaderSession) {
print("Tag session active")
}
func tagReaderSession(_ session: NFCTagReaderSession, didDetect tags: [NFCTag]) {
print("Did detect tag reader session")
print(tags.count)
if case let NFCTag.miFare(tag) = tags.first! {
session.connect(to: tags.first!) { (error: Error?) in
let tagUIDData = tag.identifier
var byteData: [UInt8] = []
tagUIDData.withUnsafeBytes { byteData.append(contentsOf: $0) }
session.invalidate()
print(self.hexEncodedString(byteArray: byteData))
// DispatchQueue.main.async {
//flutterResult(self.hexEncodedString(byteArray: byteData))
// }
}
}
}
func tagReaderSession(_ session: NFCTagReaderSession, didInvalidateWithError error: Error) {
print("Tag Error: \(error.localizedDescription)")
}
func hexEncodedString(byteArray: [UInt8]) -> String {
let hexDigits = Array("0123456789abcdef".utf16)
var hexChars = [UTF16.CodeUnit]()
hexChars.reserveCapacity(byteArray.count * 2)
for byte in byteArray {
let (index1, index2) = Int(byte).quotientAndRemainder(dividingBy: 16)
hexChars.append(hexDigits[index1])
hexChars.append(hexDigits[index2])
}
return String(utf16CodeUnits: hexChars, count: hexChars.count)
}
}
When i'm pressing the button in my app, i can see the NFC reading window on my phone iOS app NFC reading window
But, when i put the card up to a phone, there is noting happened. Android Studio console Android studio console
2. NFCNDEFReaderSession
import UIKit
import Flutter
import CoreNFC
@available(iOS 13.0, *)
var session_tag: NFCNDEFReaderSession?
@available(iOS 13.0, *)
var flutterResult: FlutterResult!
@available(iOS 13.0, *)
@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate, NFCNDEFReaderSessionDelegate {
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
let nfcChannel = FlutterMethodChannel(name: "samples.flutter.dev/nfc", binaryMessenger: controller.binaryMessenger)
nfcChannel.setMethodCallHandler({
[weak self] (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
// Note: this method is invoked on the UI thread.
guard call.method == "getNFCTag" else {
result(FlutterMethodNotImplemented)
return
}
if NFCNDEFReaderSession.readingAvailable {
print("we are ready for reading");
self?.startReadingNFC(result: result)
} else {
print("sorry byt not working");
}
})
GeneratedPluginRegistrant.register(with: self)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
func startReadingNFC(result: @escaping FlutterResult) {
print("start reading session")
flutterResult = result
// session_tag = NFCNDEFReaderSession(pollingOption: [.iso14443], delegate: self, queue: DispatchQueue.main)
session_tag = NFCNDEFReaderSession(delegate: self, queue: DispatchQueue.main, invalidateAfterFirstRead: false)
session_tag?.alertMessage = NSLocalizedString("Hold it!", comment: "my comment")
session_tag?.begin()
}
func tagReaderSessionDidBecomeActive(_ session: NFCNDEFReaderSession) {
print("Tag session active")
}
func readerSession(_ session: NFCNDEFReaderSession, didDetectNDEFs messages: [NFCNDEFMessage]) {
print(messages)
for message in messages {
for record in message.records {
print("next message")
print(record)
}
}
}
func readerSession(_ session: NFCNDEFReaderSession, didDetect tags: [NFCNDEFTag]) {
if (tags.count > 0) {
session.connect(to: tags.first!, completionHandler: { (connection_error) in
tags.first?.readNDEF(completionHandler: { (message, error) in
if ((message?.records.count)! > 0) {
if let dataMessage = String(data: (message?.records.first!.payload)!, encoding:.utf8) {
session.invalidate()
print(dataMessage)
}
}
})
})
}
}
func readerSession(_ session: NFCNDEFReaderSession, didInvalidateWithError error: Error) {
print("Tag Error: \(error.localizedDescription)")
}
func tagReaderSession(_ session: NFCNDEFReaderSession, didInvalidateWithError error: Error) {
print("Tag Error: \(error.localizedDescription)")
// DispatchQueue.main.async {
// session.invalidate()
// print(error.localizedDescription)
// flutterResult(error.localizedDescription)
// }
}
}
After pressing the button in the app, NFC reading window also shows up. And with the card i can get the payload Message: My message with spaces
Both approaches start fine and open the iOS's window with "read a tag", but with NFCTagReaderSession nothing is happening. It seems like there is no card. With NFCNDEFReaderSession implementation, I can read the message "My text with spaces" but, of course, I can't read the tag's UID
Am'I doing something wrong to get the UID of the card?
