IOS代码创建uinavigationcontroller

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOption

中添加代码

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];    [self.window setBackgroundColor:[UIColor whiteColor]];    myViewController *baseView = [[myViewController alloc]init];    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:baseView];        self.window.rootViewController = nav;    [self.window makeKeyAndVisible];