Swift AVFoundation 二维码扫描和生成_app

概述项目终于不需要支持iOS6了(泪崩),在二维码扫描这一块,能够完全的放弃ZXing库,改用系统的AVFoundation了,拿swift写了个Demo,效果如下: github地址:点这里有关AVFoundation和Core Image(滤镜等),可以先看看objc.io第21期和第23期的有关介绍. 初始化视频捕捉 // 初始化视频捕获 private func initCaptur

项目终于不需要支持iOS6了(泪崩),在二维码扫描这一块,能够完全的放弃ZXing库,改用系统的AVFoundation了,拿swift写了个Demo,效果如下:
github地址:点这里

有关AVFoundation和Core Image(滤镜等),可以先看看objc.io第21期和第23期的有关介绍.

初始化视频捕捉

// 初始化视频捕获    private func initCapture() {        // 代表抽象的硬件设备,这里传入vIDeo        let captureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVIDeo)        var error: NSError?        // 输入流        var captureinput = AVCaptureDeviceinput.deviceinputWithDevice(captureDevice,error: &error) as? AVCaptureDeviceinput        if (error != nil && captureinput == nil) {            let errorAlert = UIAlertController(Title: "提醒",message: "请在iPhone的\"设置-隐私-相机\"选项中,允许XXX访问您的相机",preferredStyle: .Alert)            errorAlert.addAction(UIAlertAction(Title: "确定",style: UIAlertActionStyle.Default,handler: nil))            self.presentVIEwController(errorAlert,animated: true,completion: nil)        } else {            // input和output的桥梁,它协调着intput到output的数据传输.(见字意,session-会话)            captureSession = AVCaptureSession()            captureSession!.addinput(captureinput)            // 输出流            let captureMetadataOutput = AVCaptureMetadataOutput()            // 限制扫描区域http://blog.csdn.net/lc_obj/article/details/41549469            captureMetadataOutput.rectOfInterest = CGRectMake(128.0/ScreenWH.screenHeight,(ScreenWH.screenWIDth - 280.0)/ScreenWH.screenWIDth * 2.0,280.0/ScreenWH.screenHeight,280.0/ScreenWH.screenWIDth)            captureSession!.addOutput(captureMetadataOutput)            // 添加的队列按规定必须是串行            captureMetadataOutput.setMetadataObjectsDelegate(self,queue: dispatch_get_main_queue())            // 指定信息类型,QRCode,你懂的            captureMetadataOutput.MetadataObjectTypes = [AVMetadataObjectTypeQRCode]            // 用这个预览图层和图像信息捕获会话(session)来显示视频            vIDeoPrevIEwLayer = AVCaptureVIDeoPrevIEwLayer(session: captureSession!)            vIDeoPrevIEwLayer!.vIDeoGravity = AVLayerVIDeoGravityResizeAspectFill            vIDeoPrevIEwLayer!.frame = vIEw.bounds            vIEw.layer.addSublayer(vIDeoPrevIEwLayer!)        }    }

PS:LZ用了下微信和新浪微博的扫一扫,发现那个扫描框是忽悠人的,也就是你没拿它对准二维码,只要二维码进入手机摄像头范围,就能够解码成功….囧
所以LZ在代码中做了一个扫描区域的限制(感觉蛮无聊的)

实现代理解码

// MARK: - AVCaptureMetadataOutputObjectsDelegate    func captureOutput(captureOutput: AVCaptureOutput!,dIDOutputMetadataObjects MetadataObjects: [AnyObject]!,fromConnection connection: AVCaptureConnection!) {        if MetadataObjects == nil || MetadataObjects.count == 0 {            captureVIEw!.frame = CGRectZero            return        }        // 刷取出来的数据        for MetadataObject in MetadataObjects {            if MetadataObject.type == AVMetadataObjectTypeQRCode {                let Metadata = MetadataObject as! AVMetadataMachineReadableCodeObject                // 元数据对象就会被转化成图层的坐标                let codeCoord = vIDeoPrevIEwLayer!.transformedMetadataObjectForMetadataObject(Metadata) as! AVMetadataMachineReadableCodeObject                captureVIEw!.frame = codeCoord.bounds                if Metadata.stringValue != nil {                    println("\(Metadata.stringValue)")                    self.captureSession!.stopRunning()                    let successAlert = UIAlertController(Title:"提示",message:"是否打开" + Metadata.stringValue,preferredStyle: .Alert)                    successAlert.addAction(UIAlertAction(Title:"取消",style: .Default,handler: { (_) -> VoID in self.stopCapture() })) successAlert.addAction(UIAlertAction(Title:"确定",handler: { (_) -> VoID in if Metadata.stringValue.lowercaseString.hasPrefix("http") { UIApplication.sharedApplication().openURL(NSURL(string: Metadata.stringValue)!) self.navigationController!.popVIEwControllerAnimated(true) } })) self.presentVIEwController(successAlert,animated: true,completion: nil) } } } }

数据转换AVMetadataMachineReadableCodeObject对应二维码.

生成二维码

// MARK: - Private Methods    private func createQRForString(qrString: String?,qrImagename: String?) -> UIImage?{        if let sureQRString = qrString {            let stringData = sureQRString.dataUsingEnCoding(NSUTF8StringEnCoding,allowLossyConversion: false)            // 创建一个二维码的滤镜            let qrFilter = CIFilter(name: "CiqrCodeGenerator")            qrFilter.setValue(stringData,forKey: "inputMessage")            qrFilter.setValue("H",forKey: "inputCorrectionLevel")            let qrCIImage = qrFilter.outputimage            // 创建一个颜色滤镜,黑白色            let colorFilter = CIFilter(name: "CIFalsecolor")            colorFilter.setDefaults()            colorFilter.setValue(qrCIImage,forKey: "inputimage")            colorFilter.setValue(CIcolor(red: 0,green: 0,blue: 0),forKey: "inputcolor0")            colorFilter.setValue(CIcolor(red: 1,green: 1,blue: 1),forKey: "inputcolor1")            // 返回二维码image            let codeImage = UIImage(CIImage: colorFilter.outputimage.imageByApplyingtransform(CGAffinetransformMakeScale(5,5)))            // 通常,二维码都是定制的,中间都会放想要表达意思的图片            if let iconImage = UIImage(named: qrImagename!) {                let rect = CGRectMake(0,0,codeImage!.size.wIDth,codeImage!.size.height)                UIGraphicsBeginImageContext(rect.size)                codeImage!.drawInRect(rect)                let avatarSize = CGSizeMake(rect.size.wIDth * 0.25,rect.size.height * 0.25)                let x = (rect.wIDth - avatarSize.wIDth) * 0.5                let y = (rect.height - avatarSize.height) * 0.5                iconImage.drawInRect(CGRectMake(x,y,avatarSize.wIDth,avatarSize.height))                let resultimage = UIGraphicsGetimageFromCurrentimageContext()                UIGraphicsEndImageContext()                return resultimage            }            return codeImage        }        return nil    }