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iOS 生成二维码或条码 利用CIFilter 滤镜

iOS 生成二维码或条码 利用CIFilter 滤镜

作者: 移动的键盘 | 来源:发表于2020-11-06 16:59 被阅读0次
    import UIKit
    import CoreImage
    

    YXFilter 是CIFilter的子类

    // YXFilter : CIFilter {}
    

    添加枚举区分二维码和条码

    extension YXFilter {
    
    @objc public enum QrCodeType:Int {
        //二维码
        case qr  = 1
        //条形码
        case bar = 2
    }
    } 
    

    生成二维码或者条形码

    /// 生成二维码
    /// - Parameters:
    ///   - qrContent: 二维码内容
    ///   - size: 大小
    ///   - codeType: qr 二维码  bar 条码
    /// - Returns: 目标图片
    @objc public class func filterToCreatQrCode(qrContent:String,size:CGFloat,codeType:YXFilter.QrCodeType) -> UIImage? {
        var name:String = ""
        if codeType == .bar {
            name = "CICode128BarcodeGenerator"
        }
        if codeType == .qr {
            name = "CIQRCodeGenerator"
        }
        let filter:YXFilter = YXFilter.init(name: name)!
        guard let data:Data = qrContent.data(using: .utf8) else {
            return nil
        }
        //设置内容
        filter.setValue(data, forKey: "inputMessage")
        if codeType == .qr {
            //设置纠错级别 L 20%、M 37%、Q 55%、H 65%
            filter.setValue("M", forKey: "inputCorrectionLevel")
        }
        if codeType == .bar {
            filter.setValue(5, forKey: "inputQuietSpace")
            filter.setValue(size, forKey: "inputBarcodeHeight")
        }
        guard let cioutImage = filter.outputImage else {
            return nil
        }
        let imageSize = CGSize(width: size, height: size)
        let extent:CGRect = cioutImage.extent.integral
        let scale = min(imageSize.width/extent.width, imageSize.height/extent.height)
        let width:size_t = size_t(extent.width * scale)
        let height:size_t = size_t(extent.height * scale)
        let cs:CGColorSpace = CGColorSpaceCreateDeviceGray()
        guard let cgContent:CGContext = CGContext.init(data: nil, width: width, height: height, bitsPerComponent: 8, bytesPerRow: 0, space: cs, bitmapInfo: 0) else {
            return nil
        }
        // 关联GPU
        guard let glContext:EAGLContext = EAGLContext.init(api: .openGLES3) else {
            return nil
        }
        let cicontext:CIContext = CIContext.init(eaglContext: glContext)
        guard let cgimage:CGImage = cicontext.createCGImage(cioutImage, from: extent) else {
            return nil
        }
        cgContent.interpolationQuality = CGInterpolationQuality.none
        cgContent.scaleBy(x: scale, y: scale)
        cgContent.draw(cgimage, in: extent)
        guard let newCgimage = cgContent.makeImage() else {
            return nil
        }
        return UIImage.init(cgImage: newCgimage, scale: scale, orientation: .up)
    }
    

    生成指定颜色的二维码

    /// 生成二维码
    /// - Parameters:
    ///   - color: 二维码颜色
    ///   - backColor: 二维码背景色
    ///   - qrContent: 二维码内容
    ///   - size: 大小尺寸
    ///   - codeType: .qr 二维码 .bar 条码
    /// - Returns: 目标二维码
    @objc public class func filterToCreatQrCodeWithColor(color:UIColor,backColor:UIColor,qrContent:String,size:CGFloat,codeType:YXFilter.QrCodeType) -> UIImage? {
        guard let image = self.filterToCreatQrCode(qrContent: qrContent, size: size, codeType: codeType) else {
            return nil
        }
        guard let filter = YXFilter.init(name: "CIFalseColor") else {
            return nil
        }
        guard let ciimage = CIImage.init(image: image) else {
            return nil
        }
        let ciColor = CIColor.init(color: color)
        let ciBackColor = CIColor.init(color: backColor)
        filter.setValue(ciimage, forKey: "inputImage")
        filter.setValue(ciColor, forKey: "inputColor0")
        filter.setValue(ciBackColor, forKey: "inputColor1")
        guard let outimage = filter.outputImage else {
            return nil
        }
        return UIImage.init(ciImage: outimage, scale: UIScreen.main.scale, orientation: .up)
    }
    

    二维码中间添加图片,注意设置二维码纠错级别

    /// 生成二维码,中间带图片
    /// - Parameters:
    ///   - centerImage: 二维码中的图片
    ///   - centerImageSize: 二维码中图片的大小
    ///   - qrContent: 二维码内容
    ///   - size: 二维码大小
    /// - Returns: 目标二维码图片
    @objc public class func filterToCreatQrCodeWithImage(centerImage:UIImage,centerImageSize:CGSize,qrContent:String,size:CGFloat) -> UIImage? {
        guard let image = self.filterToCreatQrCode(qrContent: qrContent, size: size, codeType: .qr) else {
            return nil
        }
        let newImageSize = CGSize(width: size, height: size)
        let newImageRect = CGRect.init(origin: CGPoint.zero, size: newImageSize)
        let centerRcte = CGRect(x: (size - centerImageSize.width)/2, y: (size - centerImageSize.height)/2, width: centerImageSize.width, height: centerImageSize.height)
        UIGraphicsBeginImageContextWithOptions(newImageSize, true, image.scale)
        image.draw(in: newImageRect)
        centerImage.draw(in: centerRcte)
        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return newImage
    }
    

    Dome:https://github.com/ShaoGangGitHub/YXCamera.git

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