Swift快速集成函数使用篇(生成二维码)

• 1 代码生成的二维码

  
  
  

  E312AE79-44A0-472E-938C-5599B04CA92A.png

• 2 一行代码集成

 //返回UIImage
      CommonFunction.CreateQRCode("张三" , qrImageName: "张三的图片,可为空")

• 3 生成二维码代码

 func CreateQRCode(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
    }