ナビゲーション付きの初期化処理

#import "AppDelegate.h"
#import "ViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    
    ViewController *viewController = [[ViewController alloc] init];
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
    
    self.window.rootViewController = navigationController;
    [self.window makeKeyAndVisible];

    return YES;
}