[Interest] Qt, iOS, CoreNFC?

[Jason H]

I'm trying to hack NFC support into my app, but CoreNFC is not yet supported by 
Qt.

https://bugreports.qt.io/browse/QTBUG-63253

It seems simple enough though, but I an not good with Objective-C, and all the 
examples are in Swift.

So here's what I tried:
0. Take care of entitlements and such.
1. For my QIOSApplication Deleage, it was
@interface QIOSApplicationDelegate : UIResponder <UIApplicationDelegate>
changed to:
@interface QIOSApplicationDelegate : UIResponder <UIApplicationDelegate, 
NFCNDEFReaderSessionDelegate>
2. Add @property (strong, nonatomic) NFCNDEFReaderSession *nfcSession; to the 
delegate
3. Just as a test, in didFinishLaunchingWithOptions, add:
        if (![NFCNDEFReaderSession readingAvailable]) {
                qDebug() << "NFC not available";
        } else {
                qDebug() << "NFC available";
                _nfcSession = [[NFCNDEFReaderSession alloc] 
initWithDelegate:self queue:nil invalidateAfterFirstRead:NO];
                [_nfcSession beginSession];
        }
4. Add the following functions to the app delegate:
- (void)readerSession:(NFCNDEFReaderSession *)session didDetectNDEFs:( 
NSArray<NFCNDEFMessage *> *)messages {
        qDebug() << "NFCNDEFReaderSession didDetectNDEFs" << messages;
        NSLog(@"NFCNDEFReaderSession didDetectNDEFs: %@",messages);
        for (NFCNDEFMessage *message in messages) {
                qDebug() << message;
                for (NFCNDEFPayload *payload in message.records) {
                        qDebug() << payload;
                }
        }
}

- (void)readerSession:(NFCNDEFReaderSession *)session didInvalidateWithError:( 
NSError *)error {
        NSLog(@"Something went wrong: %@",error);
}

5. Launch App, present tag to phone (along the top)
6. On removal of the tag I get (3 attempts):
2018-10-04 17:36:09.291926-0400 testnfc[532:51484] [CoreNFC] 00000002 838b2f80 
-[NFCNDEFReaderSession _connectTag:error:]:418  Error Domain=NFCError Code=100 
"Stack Error" UserInfo={NSLocalizedDescription=Stack Error, 
NSUnderlyingError=0x2818a2970 {Error Domain=nfcd Code=15 "Stack Error" 
UserInfo={NSLocalizedDescription=Stack Error}}}
2018-10-04 17:36:13.579116-0400 testnfc[532:51484] [CoreNFC] 00000002 838b2f80 
-[NFCNDEFReaderSession _connectTag:error:]:418  Error Domain=NFCError Code=100 
"Stack Error" UserInfo={NSLocalizedDescription=Stack Error, 
NSUnderlyingError=0x2818a03c0 {Error Domain=nfcd Code=15 "Stack Error" 
UserInfo={NSLocalizedDescription=Stack Error}}}
2018-10-04 17:36:16.845026-0400 testnfc[532:51377] [CoreNFC] 00000002 838b2f80 
-[NFCNDEFReaderSession _connectTag:error:]:418  Error Domain=NFCError Code=100 
"Stack Error" UserInfo={NSLocalizedDescription=Stack Error, 
NSUnderlyingError=0x2818a8bd0 {Error Domain=nfcd Code=15 "Stack Error" 
UserInfo={NSLocalizedDescription=Stack Error}}}

7. The tag is valid because another app in the app store was able to get data 
from it. 

I'm really bad with Objective-C, so aside from compile errors, I don't know if 
what I am doing is right.
I'm very unsure about that , NFCNDEFReaderSessionDelegate> part.


Many thanks in advance.
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