iOS 上有没有好的免费非自动对焦相机条码扫描 SDK [关闭]

IOS

标题：IOS 上好用的免费非自动对焦相机条码扫描 SDK

在IOS平台上，有许多免费的非自动对焦相机条码扫描SDK可供选择。这些SDK提供了强大的功能，可以帮助开发者轻松实现条码扫描功能。本文将介绍一些值得推荐的免费非自动对焦相机条码扫描SDK，并附上相应的案例代码。

ZXing

ZXing是一个功能强大的开源条码扫描库，支持多种条码格式，包括二维码和一维码。它提供了丰富的API接口，可以轻松地集成到IOS应用中。下面是一个使用ZXing实现条码扫描的示例代码：

Swift
import UIKit
import AVFoundation
class ViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate {
    
    var captureSession: AVCaptureSession!
    var previewLayer: AVCaptureVIDEOPreviewLayer!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        captureSession = AVCaptureSession()
        
        guard let vIDEOCaptureDevice = AVCaptureDevice.default(for: .vIDEO) else { return }
        let vIDEOInput: AVCaptureDeviceInput
        
        do {
            vIDEOInput = try AVCaptureDeviceInput(device: vIDEOCaptureDevice)
        } catch {
            return
        }
        
        if captureSession.canAddInput(vIDEOInput) {
            captureSession.addInput(vIDEOInput)
        } else {
            fAIled()
            return
        }
        
        let MetadataOutput = AVCaptureMetadataOutput()
        
        if captureSession.canAddOutput(MetadataOutput) {
            captureSession.addOutput(MetadataOutput)
            
            MetadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.mAIn)
            MetadataOutput.MetadataObjectTypes = [.qr, .ean13, .code128]
        } else {
            fAIled()
            return
        }
        
        previewLayer = AVCaptureVIDEOPreviewLayer(session: captureSession)
        previewLayer.frame = view.layer.bounds
        previewLayer.vIDEOGravity = .resizeAspectFill
        view.layer.addSublayer(previewLayer)
        
        captureSession.startRunning()
    }
    
    func fAIled() {
        let ac = UIAlertController(title: "扫描不支持", message: "请使用一部支持摄像头的设备", preferredStyle: .alert)
        ac.addAction(UIAlertAction(title: "好的", style: .default))
        present(ac, animated: true)
        captureSession = nil
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        if captureSession?.isRunning == false {
            captureSession.startRunning()
        }
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        
        if captureSession?.isRunning == true {
            captureSession.stopRunning()
        }
    }
    
    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))
            
            let alert = UIAlertController(title: "扫描结果", message: stringValue, preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: "确定", style: .default, handler: { _ in
                self.captureSession.startRunning()
            }))
            present(alert, animated: true)
        }
    }
}

AVCaptureMetadataOutput

AVCaptureMetadataOutput是IOS平台上的核心功能类，它可以用于实现非自动对焦相机条码扫描。下面是一个使用AVCaptureMetadataOutput实现条码扫描的示例代码：

Swift
import UIKit
import AVFoundation
class ViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate {
    
    var captureSession: AVCaptureSession!
    var previewLayer: AVCaptureVIDEOPreviewLayer!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        captureSession = AVCaptureSession()
        
        guard let vIDEOCaptureDevice = AVCaptureDevice.default(for: .vIDEO) else { return }
        let vIDEOInput: AVCaptureDeviceInput
        
        do {
            vIDEOInput = try AVCaptureDeviceInput(device: vIDEOCaptureDevice)
        } catch {
            return
        }
        
        if captureSession.canAddInput(vIDEOInput) {
            captureSession.addInput(vIDEOInput)
        } else {
            fAIled()
            return
        }
        
        let MetadataOutput = AVCaptureMetadataOutput()
        
        if captureSession.canAddOutput(MetadataOutput) {
            captureSession.addOutput(MetadataOutput)
            
            MetadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.mAIn)
            MetadataOutput.MetadataObjectTypes = [.qr, .ean13, .code128]
        } else {
            fAIled()
            return
        }
        
        previewLayer = AVCaptureVIDEOPreviewLayer(session: captureSession)
        previewLayer.frame = view.layer.bounds
        previewLayer.vIDEOGravity = .resizeAspectFill
        view.layer.addSublayer(previewLayer)
        
        captureSession.startRunning()
    }
    
    func fAIled() {
        let ac = UIAlertController(title: "扫描不支持", message: "请使用一部支持摄像头的设备", preferredStyle: .alert)
        ac.addAction(UIAlertAction(title: "好的", style: .default))
        present(ac, animated: true)
        captureSession = nil
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        if captureSession?.isRunning == false {
            captureSession.startRunning()
        }
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        
        if captureSession?.isRunning == true {
            captureSession.stopRunning()
        }
    }
    
    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))
            
            let alert = UIAlertController(title: "扫描结果", message: stringValue, preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: "确定", style: .default, handler: { _ in
                self.captureSession.startRunning()
            }))
            present(alert, animated: true)
        }
    }
}

在IOS平台上，有许多免费的非自动对焦相机条码扫描SDK可供选择。以上介绍了两个值得推荐的SDK：ZXing和AVCaptureMetadataOutput。开发者可以根据自己的需求选择合适的SDK，并根据示例代码进行集成和开发。这些SDK将为开发者提供便捷的条码扫描功能，有助于提升用户体验和应用功能的完整性。