import SwiftBarcodeReader

func appear(){
        presentBarcodeReader(scanTypes: [.EAN13Code], //you can specify code type to scan type as enum value
                             needChangePositionButton: true, // If you need change position button, pass `true`
                             success: { (type, value) in
            print("type:\(type) value:\(value)")
            self.resultLabel.text = "\(value)"

        }) {(canceled, error) in
            
            //cancel handle when tapped back button
            if canceled {
                print("canceled")
            }
            
            //error handle when occured some error
            if error != nil {
                print("error:\(error)")
            }
        }
    }