iOS Question NFC Tag Reading in Background

Erel said:

Note that most devices do not support this feature. It is only supported by iPhone XS+ devices.

If you have such device I can help you implement this feature.

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Erel said:

Start with these instructions:
1. Add the associated domains capability and download and update provision profile:

2. Based on the NFCExtra example. Add this line:

B4X:

#Entitlement: <key>com.apple.developer.associated-domains</key><array><string>applinks:b4x.com</string></array>

3. Create an NFC tag with URL data (you can use this: https://www.b4x.com/android/forum/threads/nfcex-class-write-ndef-tags.110726/#post-692860). Set the link to https://www.b4x.com

4. Add this at the end of the main module:

B4X:

#if OBJC
@end
@implementation B4IAppDelegate (nfc)
- (BOOL)application:(UIApplication *)application continueUserActivity:(NSUserActivity *)userActivity
   restorationHandler:(void (^)(NSArray<id<UIUserActivityRestoring>> *restorableObjects))restorationHandler {
   NSLog(@"continueUserActivity");
   if (userActivity.activityType != NSUserActivityTypeBrowsingWeb)
       return false;
   B4I* bi = [b4i_main new].bi;
   [bi raiseEvent:nil event:@"application_nfc:" params:@[userActivity.ndefMessagePayload]];
   return true;
}
#End If

5. Run your app in debug mode, move it to the background and try to scan. Do you see the 'continueUserActivity' message in the logs?

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