ShareViewController.swift

import UIKit
import Social
import SwiftUI
import MobileCoreServices

@objc(CustomShareNavigationController)
class CustomShareNavigationController: UINavigationController {
    
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        self.loadView()
        // 2: set the ViewControllers
        print(self.extensionContext);
        
        self.addChild(UIHostingController(rootView: CustomShareViewController(context: self.extensionContext)))
}
    
    @available(*, unavailable)
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
    
}


struct CustomShareViewController: View {
    
    var context: NSExtensionContext?;
        var body: some View {
            Button(action: {print(self.context)}) {
                Text(String(describing: context))
            }
        }
      
}