SWIFT Scan QRCode

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SWIFT中掃描QRCode代碼如下，照著敲一次再看下API的注釋應該就沒問題了。

import UIKitimport Foundationimport AVFoundationclass ViewController: UIViewController,AVCaptureMetadataOutputObjectsDelegate,UIAlertViewDelegate {    let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)    let session = AVCaptureSession()    var layer:AVCaptureVideoPreviewLayer?        override func viewDidLoad() {        super.viewDidLoad()        self.view.backgroundColor = UIColor.grayColor()        let lblIntroduction = UILabel(frame: CGRectMake(10, 80, 300, 50))        lblIntroduction.text = "Scan QRCode"        lblIntroduction.textColor = UIColor.whiteColor()        self.view.addSubview(lblIntroduction)                //let imageView = UIImageView(frame: CGRectMake(10, 140, 300, 300))        //imageView.image = UIImage(named: "pick_bg")        //self.view.addSubview(imageView)        
        //add scan line effect
        let line = UIView(frame: CGRectMake(20, 150, 280, 1))
        line.backgroundColor = UIColor.yellowColor()
        self.view.addSubview(line)
        
        UIView.animateWithDuration(2.5, delay: 0, options: UIViewAnimationOptions.Repeat, animations: { () -> Void in
              line.frame = CGRectMake(20, 430, 280, 1)
            }, completion: nil)

        setupCamera()    }        func setupCamera() {        //An AVCaptureSession preset suitable for medium quality output        self.session.sessionPreset = AVCaptureSessionPresetMedium //AVCaptureSessionPresetHigh        var error:NSError?        //This step is to ask device where it can use back camera        let input = AVCaptureDeviceInput(device: device, error: &error)        if error != nil {            println(error?.description)            return        }                if session.canAddInput(input) {            session.addInput(input)        }                layer = AVCaptureVideoPreviewLayer(session: session)        layer?.videoGravity = AVLayerVideoGravityResizeAspectFill        layer?.frame = CGRectMake(20, 150, 280, 280)        self.view.layer.insertSublayer(self.layer!, atIndex: 0)                let output = AVCaptureMetadataOutput()        output.setMetadataObjectsDelegate(self, queue: dispatch_get_main_queue())        if session.canAddOutput(output) {            session.addOutput(output)            output.metadataObjectTypes = [AVMetadataObjectTypeQRCode]        }                session.startRunning()            }            func captureOutput(captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [AnyObject]!, fromConnection connection: AVCaptureConnection!) {        var stringValue:String?        if metadataObjects.count > 0 {            var metadataObject = metadataObjects[0] as! AVMetadataMachineReadableCodeObject            stringValue = metadataObject.stringValue        }                self.session.stopRunning()        let alertView = UIAlertView()        alertView.message = stringValue        alertView.addButtonWithTitle("Sure")        alertView.delegate = self        alertView.cancelButtonIndex = 0        alertView.show()    }        func alertView(alertView: UIAlertView, clickedButtonAtIndex buttonIndex: Int) {        session.startRunning()    }    override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

 

 

refer to :https://github.com/hitourlee/Swift_QRCode

SWIFT Scan QRCode