关于iOS的二维码生成和解析

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关于iOS的二维码生成和解析

在现在的应用App中多多少少都会遇到一个功能，扫描二维码，其实扫出来的就是一个字符串，大家有兴趣可以对一些微信的二维码进行test，写个test project然后将扫描出来的结果用弹窗的形式直观地显示出来。
最近在做的个小东西就包括了扫码，并且需要将一个字符串转成一个UIImage的对象，查找了下网上大神们的blog再看了下Apple的官方文档，其实还算简单。上代码吧：

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class QRCodeUtil: NSObject {
    /**
     识别二维码，返回字符串
     
     - parameter image: 二维码图像
     - returns: 二维码字符
     */
    static func recognizeQRImage(image: UIImage) -> String{
        var temp: Int32 = 1
        let orientation = image.imageOrientation
        let detector: CIDetector = CIDetector(ofType: CIDetectorTypeQRCode, context: nil, options: [CIDetectorAccuracy:CIDetectorAccuracyHigh])
        
        switch orientation{
            case .Up:
                temp = 1
                break
            case .Down:
                temp = 3
                break
            case .Left:
                temp = 8
                break
            
            case .Right:
                temp = 6
                break
            case .UpMirrored:
                temp = 2
                break
            case .DownMirrored:
                temp = 4
                break
            case .LeftMirrored:
                temp = 5
                break
            case .RightMirrored:
                temp = 7
                break
        }
        let img = CIImage(CGImage: image.CGImage!, options: [CIDetectorImageOrientation: NSNumber(int: temp)])
        let features: [CIFeature]? = detector.featuresInImage(img, options: [CIDetectorAccuracy: CIDetectorAccuracyHigh, CIDetectorImageOrientation: NSNumber(int: temp)])
        if( features != nil && features?.count > 0)
        {
            let feature = features![0]
            
            if feature.isKindOfClass(CIQRCodeFeature)
            {
                let featureTmp:CIQRCodeFeature = feature as! CIQRCodeFeature
                
                let scanResult = featureTmp.messageString
                return scanResult
            }
        }
        return ""
    }
    
    /**
    生成二维码
    
    - parameter codeType:   code类型
    - parameter codeString: 字符串
    - parameter size:       大小
    - parameter qrColor:    二维码的颜色
    - parameter bkColor:    二维码的背景颜色
    
    - returns: 图像UIImage
    */
    static func createCode(codeType: String, codeString: String, size: CGSize, qrColor: UIColor, bkColor: UIColor )->UIImage?
    {
        let stringData = codeString.dataUsingEncoding(NSUTF8StringEncoding)
        //系统自带能生成的码
        //        CIAztecCodeGenerator
        //        CICode128BarcodeGenerator
        //        CIPDF417BarcodeGenerator
        //        CIQRCodeGenerator
        let qrFilter = CIFilter(name: codeType)
        qrFilter?.setValue(stringData, forKey: "inputMessage")
        qrFilter?.setValue("H", forKey: "inputCorrectionLevel")
        
        //上色
        let colorFilter = CIFilter(name: "CIFalseColor", withInputParameters: ["inputImage":qrFilter!.outputImage!,"inputColor0":CIColor(CGColor: qrColor.CGColor), "inputColor1": CIColor(CGColor: bkColor.CGColor)])
        
        let qrImage = colorFilter!.outputImage;
        
        //绘制
        let cgImage = CIContext().createCGImage(qrImage!, fromRect: qrImage!.extent)
        
        UIGraphicsBeginImageContext(size);
        let context = UIGraphicsGetCurrentContext();
        CGContextSetInterpolationQuality(context, CGInterpolationQuality.None);
        CGContextScaleCTM(context, 1.0, -1.0);
        CGContextDrawImage(context, CGContextGetClipBoundingBox(context), cgImage);
        let codeImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        
        return codeImage
    }
}

使用的时候也很方便，在此就不再赘述了~记录一下代码，enjoy it~！