Programming iOS: clarifications about Root View Controller

Question

Through this question I would like to know if I understand well the notion of Root View Controller.

In iOS application, the Root View Controller (RVC) is the control

Answer 1

firstly you can create A empty project in Xcode. after you add the new file on objectivec class view controller with xiv. now you can add to this code in appdeligate.m and set the rootviewcontroller in appdeligate

NOTE:- ViewController.h import to the appdeligate.m

-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

// Override point for customization after application launch.
   self.window.backgroundColor = [UIColor whiteColor];

   ViewController *viewcontroller =[[ViewController alloc]initWithNibName:@"ViewController" bundle:nil];

self.window.rootViewController= viewcontroller;




 [self.window makeKeyAndVisible];
 return YES;

}