ios:问下App启动后指定跳转Flutter页面问题。（本人ios菜鸟*初学者，在AppDelegate试过设置报错）

ios:问下App启动后指定跳转Flutter页面问题。（本人ios菜鸟*初学者，在AppDelegate试过设置报错）
正常在native端的viewcontroller里面可以跳转flutter页面，但我们首页是flutter端，我想在App里面启动FBFlutterViewContainer这个。但在AppDelegate写过。可能写的方式不对。
`
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
// UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:[[ViewController alloc]init]];
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:[[FBFlutterViewContainer alloc]init]];
self.window.rootViewController = nav;

BoostDelegate *boostDelegate = [[BoostDelegate alloc]init];
boostDelegate.navigationController = nav;

[self.window makeKeyAndVisible];
[FlutterBoost.instance setup:application delegate:boostDelegate callback:^(FlutterEngine *engine) {

}];

return YES;
}

`

Start with AppDelegate's didFinishLaunchingWithOptions implementation and the FBFlutterViewContainer, BoostDelegate, and FlutterBoost setup calls shown in the issue. Trace how the existing native view-controller flow reaches Flutter, then determine the supported startup entry point. Done requires a documented, working way to launch the Flutter page when the app starts.

Written by the indexing model from the issue text.