1.生成二维码图片

import UIKit
import CoreImagefunc generateQRCode(from string: String) -> UIImage? {let data = string.data(using: String.Encoding.utf8)if let filter = CIFilter(name: "CIQRCodeGenerator") {filter.setValue(data, forKey: "inputMessage")let transform = CGAffineTransform(scaleX: 3, y: 3)if let output = filter.outputImage?.transformed(by: transform) {return UIImage(ciImage: output)}}return nil
}class SendVC: UIViewController {override func viewDidLoad() {super.viewDidLoad()title = "旧机发送"view.backgroundColor = .whiteaddImageView()}func addImageView() {let imageView = UIImageView()view.addSubview(imageView)imageView.snp.makeConstraints { make inmake.center.equalToSuperview()make.width.height.equalTo(200)}imageView.image = generateQRCode(from: "123")}
}

2.扫描二维码（含上下扫描动画）

2.1 记得在info.plist中添加相机权限描述

• 在使用下面的代码之前，确保你的 Info.plist 文件中已添加了相机权限描述（Camera Usage Description）。

<key>NSCameraUsageDescription</key>
<string>We need access to your camera for QR code scanning.</string>

import AVFoundation
import UIKitclass QRCodeScannerViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate {var captureSession: AVCaptureSession!var previewLayer: AVCaptureVideoPreviewLayer!override func viewDidLoad() {super.viewDidLoad()// 设置 AVCaptureSessioncaptureSession = AVCaptureSession()guard let videoCaptureDevice = AVCaptureDevice.default(for: .video) else { return }let videoInput: AVCaptureDeviceInputdo {videoInput = try AVCaptureDeviceInput(device: videoCaptureDevice)} catch {return}if captureSession.canAddInput(videoInput) {captureSession.addInput(videoInput)} else {return}let metadataOutput = AVCaptureMetadataOutput()if captureSession.canAddOutput(metadataOutput) {captureSession.addOutput(metadataOutput)metadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)metadataOutput.metadataObjectTypes = [.qr]} else {return}// 设置预览图层previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)previewLayer.frame = view.layer.boundspreviewLayer.videoGravity = .resizeAspectFillview.layer.addSublayer(previewLayer)// 开始扫描captureSession.startRunning()addMaskToScannerView()}var scanningLine: UIView!func addMaskToScannerView() {// 计算正方形的位置，使其位于视图的正中心let squareSize: CGFloat = 300let squareX = (view.bounds.width - squareSize) / 2let squareY = (view.bounds.height - squareSize) / 2// 创建四个半透明的 UIView 元素作为遮罩let topMask = UIView(frame: CGRect(x: 0, y: 0, width: view.bounds.width, height: squareY))let bottomMask = UIView(frame: CGRect(x: 0, y: squareY + squareSize, width: view.bounds.width, height: view.bounds.height - (squareY + squareSize)))let leftMask = UIView(frame: CGRect(x: 0, y: squareY, width: squareX, height: squareSize))let rightMask = UIView(frame: CGRect(x: squareX + squareSize, y: squareY, width: view.bounds.width - (squareX + squareSize), height: squareSize))// 设置遮罩的背景颜色[topMask, bottomMask, leftMask, rightMask].forEach {$0.backgroundColor = UIColor.black.withAlphaComponent(0.6)view.addSubview($0)}// 添加绿色的正方形框let squareFrame = UIView(frame: CGRect(x: squareX, y: squareY, width: squareSize, height: squareSize))squareFrame.layer.borderColor = UIColor.green.cgColorsquareFrame.layer.borderWidth = 3squareFrame.backgroundColor = .clearview.addSubview(squareFrame)// 添加扫描线scanningLine = UIView(frame: CGRect(x: squareX, y: squareY, width: squareSize, height: 2))scanningLine.backgroundColor = UIColor.redview.addSubview(scanningLine)// 扫描线动画let animation = CABasicAnimation(keyPath: "position.y")animation.fromValue = squareYanimation.toValue = squareY + squareSizeanimation.duration = 2animation.repeatCount = .infinityscanningLine.layer.add(animation, forKey: "scanning")}// 当扫描到 QRCode 时，此方法将被调用func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {captureSession.stopRunning()if let metadataObject = metadataObjects.first {guard let readableObject = metadataObject as? AVMetadataMachineReadableCodeObject else { return }guard let stringValue = readableObject.stringValue else { return }AudioServicesPlaySystemSound(SystemSoundID(kSystemSoundID_Vibrate))found(code: stringValue)}dismiss(animated: true)}func found(code: String) {print("QRCode: \(code)")// 在此处处理扫描到的 QRCode}// 其他代码，如视图将要消失时停止扫描等
}