iOS指定程序启动后初始的ViewController

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

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{

    // Override point for customization after application launch.

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

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

    UIViewController *rootViewController = [storyboard instantiateViewControllerWithIdentifier:@"MainView"];

    self.window.rootViewController = rootViewController;

    return YES;

}