AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];

    UINavigationController *nav =[[UINavigationController alloc]initWithRootViewController:[[ViewController alloc]init]];

    self.window.rootViewController =nav;

    [self.window makeKeyAndVisible];

    return YES;

}
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