- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { //创建窗口 self.window =[[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds]; //加载main.storyboard 创建控制器 UIStoryboard * stotyboard=[UIStoryboard storyboardWithName:@"main" bundle:nil]; //1.加载箭头指向的控制器 UIViewController *vc = [stotyboard instantiateInitialViewController]; //设置跟控制器 self.window.rootViewController=vc; //显示窗口 [self.window makeKeyAndVisible]; return YES; }