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STScanManager.swift
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371 lines (335 loc) · 14.7 KB
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//
// STScanManager.swift
// STBaseProject
//
// Created by 寒江孤影 on 2018/3/14.
//
import UIKit
import Photos
import AVFoundation
public enum STScanType {
case qrCode
case barCode
case all
}
public typealias STScanFinishBlock = (_ result: String) -> Void
public enum STScanError: LocalizedError {
case invalidContent
case invalidSize
case recognitionFailed
case noQRCodeFound
case cameraNotAvailable
case cameraPermissionDenied
public var errorDescription: String? {
switch self {
case .invalidContent: return "Content is empty"
case .invalidSize: return "Size is zero"
case .recognitionFailed: return "Failed to process image"
case .noQRCodeFound: return "No QR code found in image"
case .cameraNotAvailable: return "Camera is not available"
case .cameraPermissionDenied: return "Camera permission denied"
}
}
}
public class STScanManager: NSObject {
public var scanRect: CGRect?
public var scanRectView: STScanView?
private weak var presentVC: UIViewController?
private var scanFinishBlock: STScanFinishBlock?
private var scanType: STScanType = .qrCode
private var device: AVCaptureDevice?
private var session: AVCaptureSession?
private var input: AVCaptureDeviceInput?
private var output: AVCaptureMetadataOutput?
private var preview: AVCaptureVideoPreviewLayer?
// AVCaptureSession 的所有配置、startRunning、stopRunning 必须在此队列执行
private let sessionQueue = DispatchQueue(label: "com.st.scan.session", qos: .userInitiated)
public init(presentViewController: UIViewController) {
super.init()
self.presentVC = presentViewController
}
public init(qrType type: STScanType, presentViewController: UIViewController, onFinish: @escaping STScanFinishBlock) {
super.init()
self.presentVC = presentViewController
self.scanType = type
self.scanFinishBlock = onFinish
self.configScanManager()
}
deinit {
self.sessionQueue.async { [session = self.session] in
session?.stopRunning()
}
self.session = nil
}
// MARK: - Public instance API
public func st_scanFinishCallback(block: @escaping STScanFinishBlock) {
self.scanFinishBlock = block
}
public func st_beginScan() {
self.sessionQueue.async { [weak self] in
self?.session?.startRunning()
}
}
public func st_stopScan() {
self.sessionQueue.async { [weak self] in
guard let session = self?.session, session.isRunning else { return }
session.stopRunning()
}
}
public func detailSelectPhoto(image: UIImage) {
Task { @MainActor [weak self] in
guard let self else { return }
do {
let result = try await STScanManager.recognizeQRCode(in: image)
self.st_renderUrlStr(url: result)
} catch {
self.st_renderUrlStr(url: "")
}
}
}
// MARK: - Static async API（CPU 密集操作下沉到后台线程）
public static func recognizeQRCode(in image: UIImage) async throws -> String {
return try await Task.detached(priority: .userInitiated) {
guard let ciImage = CIImage(image: image) else { throw STScanError.recognitionFailed }
let context = CIContext()
let detector = CIDetector(ofType: CIDetectorTypeQRCode, context: context, options: [CIDetectorAccuracy: CIDetectorAccuracyHigh])
let features = detector?.features(in: ciImage) ?? []
guard let feature = features.first as? CIQRCodeFeature,
let result = feature.messageString else {
throw STScanError.noQRCodeFound
}
return result
}.value
}
public static func generateQRCode(
content: String,
size: CGSize,
color: UIColor = .black,
background: UIColor = .white
) async throws -> UIImage {
guard !content.isEmpty else { throw STScanError.invalidContent }
guard size != .zero else { throw STScanError.invalidSize }
return try await Task.detached(priority: .userInitiated) {
try _generateQRImage(content: content, size: size, color: color, background: background)
}.value
}
public static func generateQRCode(
content: String,
size: CGSize,
watermark: UIImage,
watermarkSize: CGSize
) async throws -> UIImage {
guard !content.isEmpty else { throw STScanError.invalidContent }
guard size != .zero, watermarkSize != .zero else { throw STScanError.invalidSize }
return try await Task.detached(priority: .userInitiated) {
try _generateQRImageWithWatermark(content: content, size: size, watermark: watermark, watermarkSize: watermarkSize)
}.value
}
public static func generateBarCode(
content: String,
size: CGSize,
color: UIColor = .black,
background: UIColor = .white
) async throws -> UIImage {
guard !content.isEmpty else { throw STScanError.invalidContent }
guard size != .zero else { throw STScanError.invalidSize }
return try await Task.detached(priority: .userInitiated) {
try _generateBarCodeImage(content: content, size: size, color: color, background: background)
}.value
}
// MARK: - Private image helpers
private static func _generateQRImage(
content: String,
size: CGSize,
color: UIColor,
background: UIColor
) throws -> UIImage {
guard let data = content.data(using: .utf8) else { throw STScanError.invalidContent }
guard let qrFilter = CIFilter(name: "CIQRCodeGenerator") else { throw STScanError.recognitionFailed }
qrFilter.setValue(data, forKey: "inputMessage")
qrFilter.setValue("H", forKey: "inputCorrectionLevel")
guard let colorFilter = CIFilter(name: "CIFalseColor", parameters: [
"inputImage": qrFilter.outputImage ?? CIImage.empty(),
"inputColor0": CIColor(cgColor: color.cgColor),
"inputColor1": CIColor(cgColor: background.cgColor)
]) else { throw STScanError.recognitionFailed }
let ciImage = colorFilter.outputImage ?? CIImage.empty()
guard let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else {
throw STScanError.recognitionFailed
}
let renderer = UIGraphicsImageRenderer(size: size)
return renderer.image { ctx in
ctx.cgContext.interpolationQuality = .none
UIImage(cgImage: cgImage).draw(in: CGRect(origin: .zero, size: size))
}
}
private static func _generateBarCodeImage(
content: String,
size: CGSize,
color: UIColor,
background: UIColor
) throws -> UIImage {
guard let data = content.data(using: .utf8) else { throw STScanError.invalidContent }
guard let barFilter = CIFilter(name: "CICode128BarcodeGenerator") else { throw STScanError.recognitionFailed }
barFilter.setValue(data, forKey: "inputMessage")
guard let colorFilter = CIFilter(name: "CIFalseColor", parameters: [
"inputImage": barFilter.outputImage ?? CIImage.empty(),
"inputColor0": CIColor(cgColor: color.cgColor),
"inputColor1": CIColor(cgColor: background.cgColor)
]) else { throw STScanError.recognitionFailed }
let ciImage = colorFilter.outputImage ?? CIImage.empty()
guard let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else {
throw STScanError.recognitionFailed
}
let renderer = UIGraphicsImageRenderer(size: size)
return renderer.image { ctx in
ctx.cgContext.interpolationQuality = .none
UIImage(cgImage: cgImage).draw(in: CGRect(origin: .zero, size: size))
}
}
private static func _generateQRImageWithWatermark(
content: String,
size: CGSize,
watermark: UIImage,
watermarkSize: CGSize
) throws -> UIImage {
guard let data = content.data(using: .utf8) else { throw STScanError.invalidContent }
guard let qrFilter = CIFilter(name: "CIQRCodeGenerator") else { throw STScanError.recognitionFailed }
qrFilter.setValue(data, forKey: "inputMessage")
qrFilter.setValue("H", forKey: "inputCorrectionLevel")
let ciImage = qrFilter.outputImage ?? CIImage.empty()
let extent = ciImage.extent.integral
let scale = min(size.width / extent.width, size.height / extent.height)
let scaledWidth = extent.width * scale
let scaledHeight = extent.height * scale
let cs = CGColorSpaceCreateDeviceGray()
guard let bitmapCtx = CGContext(
data: nil,
width: Int(scaledWidth), height: Int(scaledHeight),
bitsPerComponent: 8, bytesPerRow: 0,
space: cs,
bitmapInfo: CGImageAlphaInfo.none.rawValue
) else { throw STScanError.recognitionFailed }
guard let baseCGImage = CIContext().createCGImage(ciImage, from: extent) else {
throw STScanError.recognitionFailed
}
bitmapCtx.interpolationQuality = .none
bitmapCtx.scaleBy(x: scale, y: scale)
bitmapCtx.draw(baseCGImage, in: extent)
guard let scaledCGImage = bitmapCtx.makeImage() else { throw STScanError.recognitionFailed }
let baseImage = UIImage(cgImage: scaledCGImage)
let renderer = UIGraphicsImageRenderer(size: size)
return renderer.image { _ in
baseImage.draw(in: CGRect(origin: .zero, size: size))
let origin = CGPoint(
x: (size.width - watermarkSize.width) / 2.0,
y: (size.height - watermarkSize.height) / 2.0
)
watermark.draw(in: CGRect(origin: origin, size: watermarkSize))
}
}
// MARK: - Private setup
private func configScanManager() {
self.st_scanDevice()
self.st_drawScanView()
}
private func st_scanDevice() {
self.checkCameraPermission { [weak self] granted in
guard let self, granted else { return }
// AVCaptureSession 配置移至 sessionQueue，避免主线程阻塞
self.sessionQueue.async { [weak self] in
guard let self else { return }
guard let device = AVCaptureDevice.default(for: .video) else { return }
self.device = device
let input: AVCaptureDeviceInput
do {
input = try AVCaptureDeviceInput(device: device)
} catch {
print("[STScanManager] AVCaptureDeviceInput 创建失败: \(error.localizedDescription)")
return
}
self.input = input
let output = AVCaptureMetadataOutput()
self.output = output
output.setMetadataObjectsDelegate(self, queue: .main)
let session = AVCaptureSession()
self.session = session
if session.canAddInput(input) { session.addInput(input) }
if session.canAddOutput(output) {
session.addOutput(output)
output.metadataObjectTypes = self.metadataObjectTypes(for: self.scanType)
output.rectOfInterest = self.st_scanRectWithScale(scale: 1).rectOfInterest
}
// 预览层必须在主线程插入
DispatchQueue.main.async { [weak self] in
guard let self else { return }
let preview = AVCaptureVideoPreviewLayer(session: session)
self.preview = preview
preview.videoGravity = .resizeAspectFill
preview.frame = UIScreen.main.bounds
self.presentVC?.view.layer.insertSublayer(preview, at: 0)
}
}
}
}
private func metadataObjectTypes(for type: STScanType) -> [AVMetadataObject.ObjectType] {
switch type {
case .qrCode: return [.qr]
case .barCode: return [.code128, .code39, .ean13, .ean8, .upce, .pdf417]
case .all: return [.qr, .code128, .code39, .ean13, .ean8, .upce, .pdf417]
}
}
private func checkCameraPermission(completion: @escaping (Bool) -> Void) {
guard UIImagePickerController.isSourceTypeAvailable(.camera) else {
completion(false)
return
}
let status = AVCaptureDevice.authorizationStatus(for: .video)
switch status {
case .authorized:
completion(true)
case .notDetermined:
AVCaptureDevice.requestAccess(for: .video) { granted in
DispatchQueue.main.async { completion(granted) }
}
case .denied, .restricted:
completion(false)
@unknown default:
completion(false)
}
}
private func st_drawScanView() {
let width = self.presentVC?.view.bounds.size.width ?? UIScreen.main.bounds.width
let height = self.presentVC?.view.bounds.size.height ?? UIScreen.main.bounds.height
let view = STScanView(frame: CGRect(x: 0, y: 0, width: width, height: height))
view.st_configScanType(scanType: self.scanType)
self.scanRectView = view
self.presentVC?.view.addSubview(view)
}
private func st_scanRectWithScale(scale: CGFloat) -> (rectOfInterest: CGRect, scanSize: CGSize) {
let windowSize = UIScreen.main.bounds.size
let left = 60.0 / scale
let scanWidth = (self.presentVC?.view.frame.size.width ?? windowSize.width) - left * 2.0
let scanSize = CGSize(width: scanWidth, height: scanWidth / scale)
let scanX = (windowSize.width - scanSize.width) / 2.0
let scanY = (windowSize.height - scanSize.height) / 2.0
// AVFoundation rectOfInterest: normalized coords, axes swapped vs portrait screen
let rectOfInterest = CGRect(
x: scanY / windowSize.height,
y: scanX / windowSize.width,
width: scanSize.height / windowSize.height,
height: scanSize.width / windowSize.width
)
return (rectOfInterest, scanSize)
}
private func st_renderUrlStr(url: String) {
self.scanFinishBlock?(url)
}
}
extension STScanManager: AVCaptureMetadataOutputObjectsDelegate {
public func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
guard let metadataObject = metadataObjects.first as? AVMetadataMachineReadableCodeObject else { return }
self.st_stopScan()
self.st_renderUrlStr(url: metadataObject.stringValue ?? "")
}
}