Swift快速集成函数使用篇(生成二维码)

最新推荐文章于 2024-05-14 09:41:06 发布

转载最新推荐文章于 2024-05-14 09:41:06 发布 · 462 阅读

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本文介绍如何使用Swift语言生成二维码，包括创建二维码滤镜、颜色滤镜，并实现将自定义图片嵌入到二维码中。

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
  }

文／Hcy_
原文链接：http://www.jianshu.com/p/8872f96587e9