Question

我已经集成了QR码扫描仪并且工作正常但是成功扫描后问题无法关闭相机。在我的代码中，如果点击确认按钮，我想关闭相机...请帮帮我谢谢!!

@objc func scanButtonTapped(sender: UIButton) {
let session = AVCaptureSession()
    let captureDevice = AVCaptureDevice.default(for: .video)
    do {
        let input = try AVCaptureDeviceInput(device: captureDevice!)
        session.addInput(input)
    } catch {
        self.view.makeToast("Sorry Scanner is not working!")
    }

    let output = AVCaptureMetadataOutput()
    session.addOutput(output)
    output.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
    output.metadataObjectTypes = [AVMetadataObject.ObjectType.qr]
    video = AVCaptureVideoPreviewLayer(session: session)
    video.frame = view.layer.bounds
    view.layer.addSublayer(video)
    session.startRunning()
}

func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
    if metadataObjects != nil && metadataObjects.count != 0 {
        if let object = metadataObjects[0] as? AVMetadataMachineReadableCodeObject {
            if object.type == AVMetadataObject.ObjectType.qr {

                let alert = UIAlertController(title: "QR Code", message: object.stringValue, preferredStyle: .alert)
                alert.addAction(UIAlertAction(title:"Retake", style: .default, handler: nil))
                alert.addAction(UIAlertAction(title:"Confirm", style: .default, handler: { (nil) in
                    self.scannedCode = object.stringValue!
                }))
                present(alert, animated: true, completion: nil)
            }
        }
    }
}

Answer 1

首先，您需要将会话对象保存为控制器中的实例变量。例如，

var session: AVCaptureSession?

然后在需要使用相机时实例化会话

self.session = AVCaptureSession()

然后您可以从您的metadataOutput方法引用。

self.session.stopRunning()

Answer 2

将以下代码替换为确认操作：

alert.addAction(UIAlertAction(title:"Confirm", style: .default, handler: { (nil) in
                    self.scannedCode = object.stringValue!
                    self.session.stopRunning()
                }

如何在扫描成功后关闭Qr代码扫描程序 - Swift 4

2 个答案: