实现订单 Tab 并接入扫码核销流程

suixinkan/UI/Scan/QRCodeScannerViewController.swift

@@ -0,0 +1,150 @@
+//
+//  QRCodeScannerViewController.swift
+//  suixinkan
+//
+
+import AVFoundation
+import SnapKit
+import UIKit
+
+/// AVFoundation 二维码扫描页。
+final class QRCodeScannerViewController: BaseViewController, AVCaptureMetadataOutputObjectsDelegate {
+
+    var onScanResult: ((String) -> Void)?
+
+    private let captureSession = AVCaptureSession()
+    private var previewLayer: AVCaptureVideoPreviewLayer?
+    private var hasHandledResult = false
+
+    private let maskView = UIView()
+    private let hintLabel = UILabel()
+    private let closeButton = UIButton(type: .system)
+
+    override func setupNavigationBar() {
+        navigationController?.setNavigationBarHidden(true, animated: false)
+    }
+
+    override func setupUI() {
+        view.backgroundColor = .black
+        hintLabel.text = "将二维码放入框内"
+        hintLabel.textColor = .white
+        hintLabel.font = .systemFont(ofSize: 14)
+        hintLabel.textAlignment = .center
+
+        closeButton.setTitle("关闭", for: .normal)
+        closeButton.setTitleColor(.white, for: .normal)
+        closeButton.addTarget(self, action: #selector(closeTapped), for: .touchUpInside)
+
+        view.addSubview(maskView)
+        view.addSubview(hintLabel)
+        view.addSubview(closeButton)
+    }
+
+    override func setupConstraints() {
+        closeButton.snp.makeConstraints { make in
+            make.top.equalTo(view.safeAreaLayoutGuide).offset(12)
+            make.trailing.equalToSuperview().inset(16)
+        }
+        hintLabel.snp.makeConstraints { make in
+            make.centerX.equalToSuperview()
+            make.bottom.equalTo(view.safeAreaLayoutGuide).inset(48)
+        }
+        maskView.snp.makeConstraints { make in
+            make.center.equalToSuperview()
+            make.size.equalTo(260)
+        }
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        checkCameraPermission()
+    }
+
+    override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        previewLayer?.frame = view.bounds
+        updateMask()
+    }
+
+    override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+        if captureSession.isRunning {
+            captureSession.stopRunning()
+        }
+    }
+
+    private func checkCameraPermission() {
+        switch AVCaptureDevice.authorizationStatus(for: .video) {
+        case .authorized:
+            setupCamera()
+        case .notDetermined:
+            AVCaptureDevice.requestAccess(for: .video) { [weak self] granted in
+                DispatchQueue.main.async {
+                    granted ? self?.setupCamera() : self?.showPermissionDenied()
+                }
+            }
+        default:
+            showPermissionDenied()
+        }
+    }
+
+    private func showPermissionDenied() {
+        showToast("需要相机权限才能扫码")
+        dismiss(animated: true)
+    }
+
+    private func setupCamera() {
+        guard let device = AVCaptureDevice.default(for: .video),
+              let input = try? AVCaptureDeviceInput(device: device) else {
+            showToast("无法打开相机")
+            return
+        }
+        guard captureSession.canAddInput(input) else { return }
+        captureSession.addInput(input)
+
+        let output = AVCaptureMetadataOutput()
+        guard captureSession.canAddOutput(output) else { return }
+        captureSession.addOutput(output)
+        output.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
+        output.metadataObjectTypes = [.qr]
+
+        let layer = AVCaptureVideoPreviewLayer(session: captureSession)
+        layer.videoGravity = .resizeAspectFill
+        view.layer.insertSublayer(layer, at: 0)
+        previewLayer = layer
+
+        DispatchQueue.global(qos: .userInitiated).async { [weak self] in
+            self?.captureSession.startRunning()
+        }
+    }
+
+    private func updateMask() {
+        maskView.layer.sublayers?.forEach { $0.removeFromSuperlayer() }
+        let border = CAShapeLayer()
+        border.path = UIBezierPath(roundedRect: maskView.bounds, cornerRadius: 12).cgPath
+        border.strokeColor = AppColor.primary.cgColor
+        border.fillColor = UIColor.clear.cgColor
+        border.lineWidth = 2
+        maskView.layer.addSublayer(border)
+    }
+
+    func metadataOutput(
+        _ output: AVCaptureMetadataOutput,
+        didOutput metadataObjects: [AVMetadataObject],
+        from connection: AVCaptureConnection
+    ) {
+        guard !hasHandledResult,
+              let object = metadataObjects.first as? AVMetadataMachineReadableCodeObject,
+              object.type == .qr,
+              let value = object.stringValue,
+              !value.isEmpty else { return }
+        hasHandledResult = true
+        captureSession.stopRunning()
+        onScanResult?(value)
+        dismiss(animated: true)
+    }
+
+    @objc private func closeTapped() {
+        dismiss(animated: true)
+    }
+}