flutter_webview_plugin/ios/Classes/FlutterWebviewPlugin.m

#import "FlutterWebviewPlugin.h"

@implementation FlutterWebviewPlugin {
+ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar> *)registrar {
  FlutterMethodChannel *channel =
       [FlutterMethodChannel methodChannelWithName:CHANNEL_NAME binaryMessenger:registrar.messenger];
   [channel setMethodCallHandler:^(FlutterMethodCall *call, FlutterResult result) {
     NSString *method = [call method];
     NSDictionary *arguments = [call arguments];

     result(FlutterMethodNotImplemented);
}

@end