CoreNFC Read and write NFC tags on iPhone using the CoreNFC framework. Covers NDEF reader sessions, tag reader sessions, NDEF message construction, entitlements, and background tag reading. Targets Swift 6.3 / iOS 26+. Contents - Setup - NDEF Reader Session - Tag Reader Session - Writing NDEF Messages - NDEF Payload Types - Background Tag Reading - Common Mistakes - Review Checklist - References Setup Project Configuration 1. Add the Near Field Communication Tag Reading capability in Xcode 2. Add to Info.plist with a user-facing reason string 3. Add the entitlement with the current value; do…