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

{

    // 1.创建UIWindow

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

    self.window.backgroundColor = [UIColor whiteColor];

    /*

    // 2.创建控制器

    // 2.1第一种创建方式

    NJViewController *vc = [[NJViewController alloc] init];

    vc.view.backgroundColor = [UIColor redColor];

    */

    /*

    // 2.2第二种创建方式

//    NJViewController *vc = [[NJViewController alloc] init];

    // 加载UIStoryboard(注意:仅仅是加载名称叫做Test的storyboard, 并不会创建storyboard重的控制器以及控件)

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Test" bundle:nil];

    // 创建storyboard中箭头指向的控制器

    // NJViewController *vc = [storyboard instantiateInitialViewController];

    // UIViewController *vc = [storyboard instantiateInitialViewController];

    UIViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"two"];

//    UINib *nib = [UINib nibWithNibName:@"" bundle:[NSBundle mainBundle]];

//    [[nib instantiateWithOwner:nil options:nil] lastObject];

    */

    // 2.3第三种创建方式

    // was unable to load a nib named "One"'

    // loaded the "One" nib but the view outlet was not set.'

   NJViewController *vc = [[NJViewController alloc] initWithNibName:@"One" bundle:nil];

    self.window.rootViewController = vc;

    // 3.让UIWindow显示出来

    [self.window makeKeyAndVisible];

    return YES;

}

@interface NJViewController ()

@end

@implementation NJViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

        // Custom initialization

    }

    return self;

}