iOS 生成二维码或条码 利用CIFilter 滤镜

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