flutter_mercadopago/example/ios/Runner/AppDelegate.swift

import UIKit
import Flutter

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  var navigationController: UINavigationController?;

  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    let flutterViewController: FlutterViewController = window?.rootViewController as! FlutterViewController
    GeneratedPluginRegistrant.register(with: self)
    self.navigationController = UINavigationController(rootViewController: flutterViewController);
    self.navigationController?.isToolbarHidden = true
    self.navigationController?.setNavigationBarHidden(true, animated: false);
           
    self.window = UIWindow(frame: UIScreen.main.bounds);
    self.window.rootViewController = self.navigationController;
    self.window.makeKeyAndVisible();
       
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}