1??二維碼的掃描

掃描.png

private func startAnimate() {
        //設(shè)置沖擊波底部和視圖底部對齊
        codeScanTop.constant = -codeHeight.constant
        view.layoutIfNeeded()
        UIView.animateWithDuration(2.0) {
          //設(shè)置動畫重復(fù)無數(shù)次
            UIView.setAnimationRepeatCount(MAXFLOAT)
            self.codeScanTop.constant = self.codeHeight.constant
            self.view.layoutIfNeeded()
        }
    }

??識別掃描的二維碼,代碼某些部分相對固定,不需要死記硬背哦,需要的童鞋也可以改成OC代碼使用嘞.

  //MARK:懶加載
    //輸入對象
    private lazy var input:AVCaptureDeviceInput = {
        let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
        return try! AVCaptureDeviceInput(device:device)
    }()
    //會話
    private lazy var session: AVCaptureSession = AVCaptureSession()
    //輸出對象
    private lazy var output: AVCaptureMetadataOutput = {
        let output = AVCaptureMetadataOutput()
        //默認(rèn)值為CGRectMake(0, 0, 1, 1),這個是傳入的比例,橫屏的左上角作為原點
        output.rectOfInterest = CGRectMake((0.5-(110-self.viewCenterY.constant/2)/self.view.bounds.size.height),(0.5-110/self.view.bounds.size.width), 260/self.view.bounds.size.height, 260/self.view.bounds.size.width)
        return output
    }()
    //預(yù)覽圖層
    private lazy var previewLayer : AVCaptureVideoPreviewLayer = {
        return AVCaptureVideoPreviewLayer(session :self.session)
    }()
 //專門用于描邊的圖層
    private lazy var lineLayer : CALayer = CALayer()
 //MARK:內(nèi)部控制方法,掃描二維碼
    private func startCode(){
        //判斷輸入能否添加到對話
        if !session.canAddInput(input) {
            DMLog("輸入沒有添加")
            return
        }
        //判斷輸出能否添加到會話中
        if !session.canAddOutput(output) {
            DMLog("輸出沒有添加")
            return
        }
        //添加輸入和輸出會話中
        session.addInput(input)
        session.addOutput(output)
        //設(shè)置輸出能夠解析的數(shù)據(jù)類型
        //設(shè)置數(shù)據(jù)類型一定要在輸出對象添加到會話之后才能設(shè)置
        output.metadataObjectTypes = output.availableMetadataObjectTypes
        //設(shè)置監(jiān)聽輸出解析到的數(shù)據(jù)
        output.setMetadataObjectsDelegate(self, queue: dispatch_get_main_queue())
        //添加預(yù)覽圖預(yù)覽圖層
        view.layer.insertSublayer(previewLayer, atIndex: 0)
        previewLayer.frame = view.bounds
        //視圖上加載的是二維碼的描邊
        view.layer.addSublayer(lineLayer)
        lineLayer.frame = view.bounds
        //開始掃描
        session.startRunning()
    }

接下來還需要執(zhí)行相對應(yīng)的代理方法,對掃描的消息進行相應(yīng)的處理,還有掃描到二維碼我們需要進行相應(yīng)的描邊,這樣可以定位到掃描的二維碼,即使當(dāng)你手機是成角度掃描的時候,依舊可以掃描出形狀(比如四邊形),這里用貝塞爾曲線畫圖

extension DimensionViewController:AVCaptureMetadataOutputObjectsDelegate{
 func captureOutput(captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [AnyObject]!, fromConnection connection: AVCaptureConnection!){
        //只要掃描到就會調(diào)用
        message.text = metadataObjects.last?.stringValue
        //DMLog(metadataObjects.last?.stringValue)
        //DMLog(metadataObjects.last)
        //corners { 0.4,0.9 0.5,0.9 0.5,0.6 0.4,0.7 },是二維碼邊線的四個點
        //轉(zhuǎn)換后corners { 140.3,238.3 141.7,317.6 220.6,318.9 222.4,238.8 },
        cleanLayers()
        guard let meta = metadataObjects.last as? AVMetadataObject else{
            DMLog("沒有掃描到二維碼")
            return
        }
        let objc = previewLayer.transformedMetadataObjectForMetadataObject(meta)
        guard let newObj = objc as? AVMetadataMachineReadableCodeObject else{
            return
        }
        //DMLog(newObj)
        //對掃描二維碼進行描邊
        drawLine(newObj)
    }
    private func drawLine(objc : AVMetadataMachineReadableCodeObject){
        //安全校驗
        guard let arr = objc.corners else{
            return
        }
        //創(chuàng)建圖層,用于保存繪制的矩形
        let layer = CAShapeLayer()
        layer.lineWidth = 3
        layer.strokeColor = UIColor.orangeColor().CGColor
        layer.fillColor = UIColor.clearColor().CGColor //填充顏色
        //創(chuàng)建UIBezierPat,繪制矩形,
        //let path = UIBezierPath.init(rect: CGRect(x: 100,y: 100,width: 220,height: 220))
        //貝塞爾曲線:將點移動到某一點;連接其他點,關(guān)閉路徑
        var point : CGPoint = CGPointZero
        var index = 0
        //把數(shù)組字典中的xy轉(zhuǎn)化為CGPoint
CGPointMakeWithDictionaryRepresentation(arr[index++] as! CFDictionary, &point)
        let  path = UIBezierPath()
        path.moveToPoint(point)
        //連接
        while index < arr.count {   CGPointMakeWithDictionaryRepresentation(arr[index++] as! CFDictionary, &point)
            path.addLineToPoint(point)
        }
        path.closePath()
        layer.path = path.CGPath
        lineLayer.addSublayer(layer)
    }
    private func cleanLayers(){
        //清除掃描二維碼出現(xiàn)多個圖層
        guard let subLayers = lineLayer.sublayers else{
            return
        }
        for layer in subLayers {
            layer.removeFromSuperlayer()
        }
    }
}

??接下來就到了識別相冊中的二維碼了,請看以下代碼

//從相冊中識別二維碼
        if !UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary) {
            return
        }
        let imagePicker = UIImagePickerController()
        imagePicker.delegate = self
        presentViewController(imagePicker, animated: true, completion: nil)

extension DimensionViewController : UIImagePickerControllerDelegate,UINavigationControllerDelegate{
    //實現(xiàn)該代理方法,選中一張圖片時系統(tǒng)不會自動關(guān)閉
    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]){
        guard let image = info["UIImagePickerControllerOriginalImage"] as? UIImage else{
            return
        }
        let cimage = CIImage(image:image)
        //創(chuàng)建一個探測器
        let detector = CIDetector(ofType: CIDetectorTypeQRCode,context: nil,options: [CIDetectorAccuracy : CIDetectorAccuracyHigh]) //最后一個參數(shù)是掃描的精確度
        let result = detector.featuresInImage(cimage!)
        //去除探測的數(shù)據(jù)
        for result in result{
            let codeInfo = (result as! CIQRCodeFeature).messageString
//這里的message是一個table,顯示掃描到的信息的
            message.text = codeInfo
        }
        picker.dismissViewControllerAnimated(true, completion: nil)
    }
}

??制作二維碼哦,可以填入自己預(yù)設(shè)的消息,比如"小敏萌萌噠"??,這些代碼都是非常固定,需要的時候復(fù)制粘貼下就可以了哦.

class CreatQrCodeViewController: UIViewController {

    @IBOutlet weak var qrCodeImage: UIImageView!
    override func viewDidLoad() {
        super.viewDidLoad()
        //創(chuàng)建濾鏡
        let filter = CIFilter(name: "CIQRCodeGenerator")
        //還原默認(rèn)屬性
        filter?.setDefaults()
        //設(shè)置需要生成二維碼的數(shù)據(jù)到濾鏡中
        filter?.setValue("小敏萌萌噠".dataUsingEncoding(NSUTF8StringEncoding), forKeyPath: "InputMessage")
        //從濾鏡中取出生成好的二維碼
        guard let ciImage = filter?.outputImage else{
            DMLog("沒有二維碼")
            return
        }
        qrCodeImage.image =  createNonInterpolatedUIImageFormCIImage(ciImage, size: 220)
    }
    /**
     生成高清二維碼
     
     - parameter image: 需要生成原始圖片
     - parameter size:  生成的二維碼的寬高
     */
    private func createNonInterpolatedUIImageFormCIImage(image: CIImage, size: CGFloat) -> UIImage {
        let extent: CGRect = CGRectIntegral(image.extent)
        let scale: CGFloat = min(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent))
        // 1.創(chuàng)建bitmap;
        let width = CGRectGetWidth(extent) * scale
        let height = CGRectGetHeight(extent) * scale
        let cs: CGColorSpaceRef = CGColorSpaceCreateDeviceGray()!
        let bitmapRef = CGBitmapContextCreate(nil, Int(width), Int(height), 8, 0, cs, 0)!
        let context = CIContext(options: nil)
        let bitmapImage: CGImageRef = context.createCGImage(image, fromRect: extent)
        CGContextSetInterpolationQuality(bitmapRef,  CGInterpolationQuality.None)
        CGContextScaleCTM(bitmapRef, scale, scale);
        CGContextDrawImage(bitmapRef, extent, bitmapImage);
        // 2.保存bitmap到圖片
        let scaledImage: CGImageRef = CGBitmapContextCreateImage(bitmapRef)!
        return UIImage(CGImage: scaledImage)
    }
}

以上??