myrickchow32

import UIKit
// Step 1: Import CoreNFC library
import CoreNFC 

class ViewController: UIViewController {
  // Step 2: Hold a reference to the NFCNDEFReaderSession object as long as the ViewController stays alive.
  var nfcSession: NFCNDEFReaderSession? 
  
  @IBAction func scanNFCDemoAction(_ sender: Any) {
    startNFC(alertMessage: "Please scan a NFC tag.")

myrickchow32

extension ViewController: NFCNDEFReaderSessionDelegate {
  func readerSession(_ session: NFCNDEFReaderSession, didInvalidateWithError error: Error) {
    /*
    Example of error message:
       "Session is invalidated by user cancellation" --- User has cancelled the NFC reader dialog
       "Session is invalidated due to maximum session timeout" --- Time out for scanning a NFC tag is exceeded.
       "Feature not supported" --- Device does not support the NFC feature (iPhone 6S or older) or app is running at simulator
    */
    print("The session was invalidated: \(error.localizedDescription)")
  }

myrickchow32

// invalidateAfterFirstRead = true
var nfcSession = NFCNDEFReaderSession.init(delegate: self, queue: nil, invalidateAfterFirstRead: true)
nfcSession.begin()

extension ViewController: NFCNDEFReaderSessionDelegate {
  func readerSession(_ session: NFCNDEFReaderSession, didDetectNDEFs messages: [NFCNDEFMessage]) {
    // Handling of [NFCNDEFMessage] and return the result String
    var result = ...
    
    // Step 8: didDetectNDEFs callback is run in background thread. All UI updates must be handled carefully.

myrickchow32

// invalidateAfterFirstRead = false
var nfcSession = NFCNDEFReaderSession.init(delegate: self, queue: nil, invalidateAfterFirstRead: false)
nfcSession.begin()

extension ViewController: NFCNDEFReaderSessionDelegate {
  func readerSession(_ session: NFCNDEFReaderSession, didDetectNDEFs messages: [NFCNDEFMessage]) {
    // Handling of [NFCNDEFMessage] and return the result String
    var result = ...
    
    // Step 8: didDetectNDEFs callback is run in background thread. All UI updates must be handled carefully.

myrickchow32

// invalidateAfterFirstRead = false
var nfcSession = NFCNDEFReaderSession.init(delegate: self, queue: nil, invalidateAfterFirstRead: false)
nfcSession.begin()

extension ViewController: NFCNDEFReaderSessionDelegate {
  func readerSession(_ session: NFCNDEFReaderSession, didDetectNDEFs messages: [NFCNDEFMessage]) {
    // Handling of [NFCNDEFMessage] and return the result String
    var result = ...
    
    // Step 8: didDetectNDEFs callback is run in background thread. All UI updates must be handled carefully.

myrickchow32

// Definition of UILabels
@IBOutlet var easeInLabel: UILabel!
@IBOutlet var easeOutLabel: UILabel!
@IBOutlet var easeInOutLabel: UILabel!
@IBOutlet var linearLabel: UILabel!
@IBOutlet var transitionFlipFromLeftLabel: UILabel!
@IBOutlet var transitionFlipFromRightLabel: UILabel!
@IBOutlet var transitionCurlUpLabel: UILabel!
@IBOutlet var transitionCurlDownLabel: UILabel!
@IBOutlet var transitionCrossDissolveLabel: UILabel!

myrickchow32

// All animations are done with the same length of duration --- 1.0 second
let durationOfAnimationInSecond = 1.0 

func curveAnimation(view: UIView, animationOptions: UIView.AnimationOptions, isReset: Bool) {
  let defaultXMovement: CGFloat = 240
  UIView.animate(withDuration: durationOfAnimationInSecond, delay: 0, options: animationOptions, animations: {
    view.transform = isReset ? .identity : CGAffineTransform.identity.translatedBy(x: defaultXMovement, y: 0)
  }, completion: nil)
}

myrickchow32

@IBOutlet var easeInLabelLeadingConstraint: NSLayoutConstraint!
@IBAction func startAnimationButtonAction(_ sender: Any) {
    // Print out the corresponding information of easeInLabel before and after animation
    print("\(isAnimated ? "easeInLabel has been moved." : "easeInLabel is at its original position.")")
    print("easeInLabelLeadingConstraint: \(easeInLabelLeadingConstraint.constant)")
    print("easeInLabel frame: \(easeInLabel.frame)")
    print("*********************************************")
    // Animation function ...
}

myrickchow32

func curveAnimation(view: UIView, animationOptions: UIView.AnimationOptions, isReset: Bool) {
  // Solution: Combine with .allowUserInteraction
  let combinedAnimationOptions: UIView.AnimationOptions = [animationOptions, .allowUserInteraction]
  
  let defaultXMovement: CGFloat = 240
  UIView.animate(withDuration: durationOfAnimationInSecond, delay: 0, options: combinedAnimationOptions, animations: {
    view.transform = isReset ? .identity : CGAffineTransform.identity.translatedBy(x: defaultXMovement, y: 0)
  }, completion: nil)
}

myrickchow32

@IBOutlet var easeInOutRepeatLabel: UILabel!
easeInOutRepeatLabel.layer.removeAllAnimations()