iOS: How get tag uid?

[cristiandaulisio]

NfcNdefData should contain the id. In android it work but in iOS it is empty.

Is it possible get the tag uid?

[Puschor]

I have the same problem. Is there any workaround available? This is what I found so far regarding this issue:

https://stackoverflow.com/questions/57978507/reading-uids-of-nfc-cards-in-ios-13
https://stackoverflow.com/questions/51822226/corenfc-not-reading-uid-in-ios

Is this maybe related to iOS 13?

I tried to read the tag with a different iOS app and it properly shows the uid.

[demetrius-tech]

I started to work on this inspired by the phonegap-nfc plugin: https://github.com/chariotsolutions/phonegap-nfc/blob/master/src/ios/NfcPlugin.m

But, being a newbie in NativeScript, I have some issues and I need some help, please.
I cannot access some properties from the NFCTag objects.

The code can be found here and I have commented what issues I have:
https://github.com/demetrius-tech/nativescript-nfc/tree/dev

I am using demo-ng app.

Plugin iOS file is here: https://github.com/demetrius-tech/nativescript-nfc/blob/dev/src/nfc.ios.ts

Check tagReaderSessionDidDetectTags() and getTagUID() methods.

[demetrius-tech]

Does anyone know how to translate this Objective C code to TypeScript?

id tag = [tags firstObject];
NSMutableDictionary *tagMetaData = [self getTagInfo:tag];

Simply doing: const tag = tags[0]; does not return anything in tag.type

Here is what i've done so far: https://github.com/demetrius-tech/nativescript-nfc/blob/dev-uid/src/nfc.ios.ts (tagReaderSessionDidDetectTags() method)

[EddyVerbruggen]

@demetrius-tech have you tried this? const tag = tags.firstObject

[demetrius-tech]

@EddyVerbruggen: firstObject only works if I do like this: const tag = NSArray.arrayWithArray(tags).firstObject; otherwise it is not available.

Even so, if I do console.log(tag.type) it says "undefined".

console.log(tag) outputs "<NFCMiFareTag: 0x282d7e9a0>"

Probably more processing is needed on the tags[0] to extract the "type" and after that the "identifier" on the MiFare type.

[demetrius-tech]

Found a way to get the type, I will just compare this:

if (NFCTag.prototype.asNFCMiFareTag.apply(tag) === tag) {
console.log("THIS IS A MiFare tag");
tag.type = NFCTagType.MiFare;
let mifareTag:NFCMiFareTag = NFCTag.prototype.asNFCMiFareTag.apply(tag);
uid = NSData.alloc().initWithData(mifareTag.identifier);
} else if (NFCTag.prototype.asNFCISO15693Tag.apply(tag) === tag) {
console.log("ISO15693Tag");
} else if (NFCTag.prototype.asNFCISO7816Tag.apply(tag) === tag) {
console.log("NFCISO7816Tag");
} else if (NFCTag.prototype.asNFCFeliCaTag.apply(tag) === tag) {
console.log("FeliCaTag")
} else {
console.log("Unknown Tag");
}

Next step is to extract the identifier.

[demetrius-tech]

Getting the UID on iOS using NativeScript is not trivial. It always displays empty. Any ideas?

My code: https://github.com/demetrius-tech/nativescript-nfc/blob/dev-uid/src/nfc.ios.ts (getTagUID method)

Related StackOverflow topics:
https://stackoverflow.com/questions/46504035/little-endian-byte-order-ios-ble-scan-response
https://stackoverflow.com/questions/46518084/nativescript-get-string-from-interop-reference

[demetrius-tech]

I've managed to get the tag UID by adding native code ObjC library.

You can check here: https://github.com/demetrius-tech/nativescript-nfc/tree/dev-ios-write-uid/src

Also, you can find there the code for writing tags for iOS.

If interested in PR, please let me know.

[cristiandaulisio]

Hello demetrius, so you succesfull? can you explain how you did and where i retreive the tag id?

I've managed to get the tag UID by adding native code ObjC library.

You can check here: https://github.com/demetrius-tech/nativescript-nfc/tree/dev-ios-write-uid/src

Also, you can find there the code for writing tags for iOS.

If interested in PR, please let me know.

[demetrius-tech]

@Atomico001: you can find the ObjC code here: https://github.com/demetrius-tech/nativescript-nfc/tree/dev-ios-write-uid/src/platforms/ios/xcode/NfcNativeHelper

Created the libNfcNativeHelper.a library and added it to the src/platforms/ios (together with a .d.ts spec) : https://github.com/demetrius-tech/nativescript-nfc/tree/dev-ios-write-uid/src/platforms/ios

[cristiandaulisio]

@Atomico001: you can find the ObjC code here: https://github.com/demetrius-tech/nativescript-nfc/tree/dev-ios-write-uid/src/platforms/ios/xcode/NfcNativeHelper

Created the libNfcNativeHelper.a library and added it to the src/platforms/ios (together with a .d.ts spec) : https://github.com/demetrius-tech/nativescript-nfc/tree/dev-ios-write-uid/src/platforms/ios

Good job demetrius, so i need to add manually in my platform folder? Any chance you can write a little tutorial to explain which step we need to do? Time to edit your readme :)

[demetrius-tech]

Thanks @Atomico001! I still hope to find a way to avoid using native code.

You will find the generic tutorial on how to add native code to NS plug-in here: https://docs.google.com/document/d/1_PDEkC3EtZCsXhthGCmGwtCVVxOwdAepcJaUaA0Uk6k/edit?usp=sharing

Please comment if something is not clear or any issues.

[cristiandaulisio]

Thanks @demetrius-tech unlucky when i try to install your fork i receive this error when try to start nfc reader:

00000002 816faa00 -[NFCHardwareManager queueReaderSession:sessionConfig:completionHandler:]:98  error=Error Domain=NFCError Code=202 "Session invalidated unexpectedly" UserInfo={NSLocalizedDescription=Session invalidated unexpectedly}

00000002 838f6300 -[NFCTagReaderSession beginSessionWithConfig:]:324  error:Error Domain=NFCError Code=202 "Session invalidated unexpectedly" UserInfo={NSLocalizedDescription=Session invalidated unexpectedly}, errorCode: 0xca

[cristiandaulisio]

any news?

[cristiandaulisio]

I realy need this, someone can help me?

[demetrius-tech]

@Atomico001: I would like to help you but I can't find time. As I mentioned before I created a library in ObjectiveC and imported it to the plug-in. But I am not sure it is the best way, so I am looking for a better way to do this, may be a POD or something. I will try to allocate some time to this soon, will let you know.

[cristiandaulisio]

@demetrius-tech nice to see you again. If you can do a working simple demo with your fork i can investigate it and try myself. Unlucky i receive many error when i tried to import your fork.

Thanks very much!

[PaulHieltjesCortegs]

@Atomico001: you can find the ObjC code here: https://github.com/demetrius-tech/nativescript-nfc/tree/dev-ios-write-uid/src/platforms/ios/xcode/NfcNativeHelper

Created the libNfcNativeHelper.a library and added it to the src/platforms/ios (together with a .d.ts spec) : https://github.com/demetrius-tech/nativescript-nfc/tree/dev-ios-write-uid/src/platforms/ios

So I tried the same thing as you and was also stuck on the issue that identifier is always null. Then I read this and thanks to your code got it working. Thank you very much!!!
Your typescript code did generate runtime errors on my device though so I ended up using my own code but with your iOS native code package.
Again, can't thank you enough for sharing your code here :)