问题
When you successfully finish an NFC reading session you'll see something like that:
This will overlay the currently presented ViewController for about 3 seconds. The fun part is that this behaviour is inconsistent since this window will disappear immediately if the reading session finish very fast.
It means that I cannot be sure about how long will this overlay stay for sure which is bad for our app's UX design.
The question is simple: is there a way to force this overlay to disappear or at least to handle the event of when it disappears (not when the NFC session if finished)?
回答1:
I've found an interesting way to hide that window. 2 simple steps are required:
1) When initialising your reader session set the last parameter to false: NFCNDEFReaderSession(delegate: self, queue: nil, invalidateAfterFirstRead: false)
2) In the body of readerSession(_ session: NFCNDEFReaderSession, didDetectNDEFs messages: [NFCNDEFMessage]) your should call session.invalidate().
That's it. It will work as if you tapped Cancel/Done - the system window will disappear immediately.
来源：https://stackoverflow.com/questions/50464810/is-it-possible-to-hide-ios-system-alert-for-nfc-reading-session