Swift 快速生产生成二维码

Posted 2021-01-08 madarax

 1 // 生成二维码
 2 final class QRGenerator {
 3     static func generate(from string: String) -> UIImage? {
 4         let context = CIContext()
 5 //        let data = string.data(using: String.Encoding.ascii)
 6         let data = string.data(using: String.Encoding.utf8)
 7 
 8         if let filter = CIFilter(name: "CIQRCodeGenerator") {
 9             filter.setValue(data, forKey: "inputMessage")
10             let transform = CGAffineTransform(scaleX: 7, y: 7)
11             if let output = filter.outputImage?.transformed(by: transform), let cgImage = context.createCGImage(output, from: output.extent) {
12                 return UIImage(cgImage: cgImage)
13             }
14         }
15         return nil
16     }
17 }

　　

ASCII编码：最早只有127个字母被编码到计算机里，也就是大小写英文字母、数字和一些符号，这个编码表被称为ASCII编码。

.ascii仅支持英文，.utf8支持中英文