SwiftUI 生成二维码

生成二维码

import SwiftUI
import CoreImage.CIFilterBuiltins
 
struct ContentView: View {
    let qrCode: String = "二维码内容"
    @State private var image: UIImage?
 
    var body: some View {
        VStack {
            if let image = image {
                Image(uiImage: image)
                    .resizable()
                    .interpolation(.none)
                    .frame(width: 100, height: 100)
            }
            
            Button(action: { generateCode() }) {
                Text("生成二维码")
            }
        }
    }
 
 	// 生成二维码
    private func generateCode() {
        guard image == nil else { return }
 
        let context = CIContext()
        let filter = CIFilter.qrCodeGenerator()
        filter.message = Data(qrCode.utf8)
 
        guard
            let outputImage = filter.outputImage,
            let cgImage = context.createCGImage(outputImage, from: outputImage.extent)
        else { return }
 
        self.image = UIImage(cgImage: cgImage)
    }
}


#Preview {
    ContentView()
}