import UIKit
import CoreImage

struct Bartendar {

    /// 生成二维码
    ///
    /// - Parameters:
    ///   - content: 二维码内容
    ///   - completion: 生成后回调
    static func createAnQRCode(withContent content: String, completion: @escaping ((UIImage?) -> Void)) {
        DispatchQueue.global().async {
            let data = content.data(using: .utf8)

            var result: UIImage?
            if let filter = CIFilter(name: "CIQRCodeGenerator") {
                filter.setValue(data, forKey: "inputMessage")

                result = {
                    let transform = CGAffineTransform(scaleX: 3, y: 3)
                    if let output = filter.outputImage?.transformed(by: transform) {
                        return UIImage(ciImage: output)
                    }
                    return nil
                }()
            }

            completion(result)
        }
    }
}