import AVFoundation//获取摄像设备let device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)do {
//创建输入,输出流 let input = try AVCaptureDeviceInput.init(device: device) let output = AVCaptureMetadataOutput() output.rectOfInterest = CGRect(x: 0.1, y: 0, width: 0.9, height: 1) //设置代理,并且在主线程刷新 output.setMetadataObjectsDelegate(self, queue: DispatchQueue.main) //初始化链接对象 / 高质量采集率 session.canSetSessionPreset(AVCaptureSessionPresetHigh) session.addInput(input) session.addOutput(output) //先添加输入输出流,后设置支持的扫码所支持的格式,不然报错如下: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 //设置扫码支持的编码格式 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) //开始捕捉 session.startRunning()}
catch let error as NSError {
print("errorInfo(error.domain)")}
/// 实现代理方法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) {
//去打开地址链接 _ = self.navigationController?.popViewController(animated: true) UIApplication.shared.open(url) }
else {
//获取非链接结果 let alertViewController = UIAlertController(title: "扫描结果", 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: "再次扫描", style: .default, handler: {
(action) in self.session.startRunning() }
) alertViewController.addAction(actionCancel) alertViewController.addAction(actinSure) self.present(alertViewController, animated: true, completion: nil) }
}
}
}
}