ios开发-载入viewcontroller的几种方式

1.故事版

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
UIViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"IDENTIFIER"];
[self.navigationController pushViewController:vc animated:YES];

2.xib

UIViewController *vc = [[UIViewController alloc] initWithNibName:@"NIBNAME" bundle:nil];

[self.navigationController pushViewController:vc animated:YES];

3.都没有

UIViewController *vc = [[UIViewController alloc] init];
[self.navigationController pushViewController:vc animated:YES];