iOS指定程序启动后初始的ViewController

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// 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;
}