Swift生成二维码、通过Color生成Image

import UIKit

extension UIImage {
    
    class func createQRCodeImage(content: String, size: CGSize) -> UIImage {
        let stringData = content.data(using: String.Encoding.utf8)
        
        let qrFilter = CIFilter(name: \"CIQRCodeGenerator\")
        qrFilter?.setValue(stringData, forKey: \"inputMessage\")
        qrFilter?.setValue(\"H\", forKey: \"inputCorrectionLevel\")
        
        let colorFilter = CIFilter(name: \"CIFalseColor\")
        colorFilter?.setDefaults()
        colorFilter?.setValuesForKeys([\"inputImage\" : (qrFilter?.outputImage)!,\"inputColor0\":CIColor.init(cgColor: UIColor.black.cgColor),\"inputColor1\":CIColor.init(cgColor: UIColor.white.cgColor)])
        
        let qrImage = colorFilter?.outputImage
        let cgImage = CIContext(options: nil).createCGImage(qrImage!, from: (qrImage?.extent)!)
        
        UIGraphicsBeginImageContext(size)
        let context = UIGraphicsGetCurrentContext()
        context!.interpolationQuality = .none
        context!.scaleBy(x: 1.0, y: -1.0)
        context?.draw(cgImage!, in: (context?.boundingBoxOfClipPath)!)
        let codeImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return codeImage!
    }
    
}

extension UIImage {
    
    class func createImageFrom(color: UIColor, width: CGFloat = 1, height: CGFloat = 1) -> UIImage? {
        let rect = CGRect(x: 0.0, y: 0.0, width: width, height: height)
        UIGraphicsBeginImageContext(rect.size)
        let context = UIGraphicsGetCurrentContext()
        context?.setFillColor(color.cgColor)
        context?.fill(rect)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image ?? nil
    }
    
    class func createImageFrom(color: UIColor, size: CGSize = CGSize(width: 1, height: 1)) -> UIImage? {
        let rect = CGRect(x: 0.0, y: 0.0, width: size.width, height: size.height)
        UIGraphicsBeginImageContext(rect.size)
        let context = UIGraphicsGetCurrentContext()
        context?.setFillColor(color.cgColor)
        context?.fill(rect)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image ?? nil
    }
    
}