1 代码生成的二维码

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,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
  }