關鍵程式碼

import AVFoundation
//獲取攝像裝置
let device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
do {
    //建立輸入,輸出流
    let input = try AVCaptureDeviceInput.init(device: device)
    let output = AVCaptureMetadataOutput()
    output.rectOfInterest = CGRect(x: 0.1, y: 0, width: 0.9, height: 1
 
)
    //設定代理,並且在主執行緒重新整理
    output.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
    //初始化連結物件 / 高質量採集率
    session.canSetSessionPreset(AVCaptureSessionPresetHigh)
    session.addInput(input)
    session.addOutput(output)

    //先新增輸入輸出流,後設置支援的掃碼所支援的格式,不然報錯如下:Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[AVCaptureMetadataOutput setMetadataObjectTypes:] Unsupported type found - use -availableMetadataObjectTypes'
 

    //http://stackoverflow.com/questions/31063846/avcapturemetadataoutput-setmetadataobjecttypes-unsupported-type-found
    //設定掃碼支援的編碼格式
    output.metadataObjectTypes = [AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code,AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code]

    let layer = AVCaptureVideoPreviewLayer(session: session)
    layer?.videoGravity = AVLayerVideoGravityResizeAspectFill
    layer?.frame = view.layer.bounds
    view.layer.insertSublayer(layer!, at: 0
 
)
    //開始捕捉
    session.startRunning()

} catch let error as NSError  {
    print("errorInfo\(error.domain)")
}

/// 實現代理方法
extension ScanCodeController:AVCaptureMetadataOutputObjectsDelegate {
    func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from connection: AVCaptureConnection!) {

        if metadataObjects.count > 0 {
            session.stopRunning()
            let object = metadataObjects[0]
            let string: String = (object as AnyObject).stringValue
            if let url = URL(string: string) {
            if UIApplication.shared.canOpenURL(url) {
                //去開啟地址連結
                _ = self.navigationController?.popViewController(animated: true)
                UIApplication.shared.open(url)

            } else {
                //獲取非連結結果
                let alertViewController = UIAlertController(title: "掃描結果", message: (object as AnyObject).stringValue, preferredStyle: .alert)
                let actionCancel = UIAlertAction(title: "退出", style: .cancel, handler: { (action) in
                    _ = self.navigationController?.popViewController(animated: true)
                })
                let actinSure = UIAlertAction(title: "再次掃描", style: .default, handler: { (action) in
                    self.session.startRunning()
                })
                alertViewController.addAction(actionCancel)
                alertViewController.addAction(actinSure)
                self.present(alertViewController, animated: true, completion: nil)
            }
            }
        }
    }
}

DEMO效果