AppDelegate.m

#include "AppDelegate.h"

#include "GeneratedPluginRegistrant.h"

@implementation AppDelegate
  -
  (BOOL) application: (UIApplication * ) application
didFinishLaunchingWithOptions: (NSDictionary * ) launchOptions {
    FlutterViewController * controller = (FlutterViewController * ) self.window.rootViewController;
    FlutterMethodChannel * nativeChannel = [FlutterMethodChannel
      methodChannelWithName: @ "flutter.native/helperChannel"
      binaryMessenger: controller
    ];
    __weak typeof (self) weakSelf = self;
    [nativeChannel setMethodCallHandler: ^ (FlutterMethodCall * call, FlutterResult result) {
      if ([@ "helloFromNativeCode"
          isEqualToString: call.method
        ]) {
        NSString * strNative = [weakSelf helloFromNativeCode];
        result(strNative);
      } else {
        result(FlutterMethodNotImplemented);
      }
    }];
    [GeneratedPluginRegistrant registerWithRegistry: self];
    return [super application: application didFinishLaunchingWithOptions: launchOptions];
  } -
  (NSString * ) helloFromNativeCode {
    return @ "Hello From Native IOS Code";
  }
@end