//MARK:- 生成二维码
static func creatQRCodeImage(text: String, WH: CGFloat) -> UIImage{
//创建滤镜
let filter = CIFilter(name: "CIQRCodeGenerator")
//还原滤镜的默认属性
filter?.setDefaults()
//设置需要生成二维码的数据
filter?.setValue(text.data(using: String.Encoding.utf8), forKey: "inputMessage")
//从滤镜中取出生成的图片
let ciImage = filter?.outputImage
//这个清晰度好
let bgImage = createNonInterpolatedUIImageFormCIImage(image: ciImage!, size: WH)
return bgImage
}
static func createNonInterpolatedUIImageFormCIImage(image: CIImage, size: CGFloat) -> UIImage {
let extent: CGRect = image.extent.integral
let scale: CGFloat = min(size/extent.width, size/extent.height)
let width = extent.width * scale
let height = extent.height * scale
let cs: CGColorSpace = CGColorSpaceCreateDeviceGray()
let bitmapRef = CGContext(data: nil, width: Int(width), height: Int(height), bitsPerComponent: 8, bytesPerRow: 0, space: cs, bitmapInfo: 0)!
let context = CIContext(options: nil)
let bitmapImage: CGImage = context.createCGImage(image, from: extent)!
bitmapRef.interpolationQuality = CGInterpolationQuality.none
bitmapRef.scaleBy(x: scale, y: scale)
bitmapRef.draw(bitmapImage, in: extent)
let scaledImage: CGImage = bitmapRef.makeImage()!
return UIImage(cgImage: scaledImage)
}
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