ios开发载入viewcontroller的几种方式

Assuming you have storyboard, go to storyboard and give your VC an identifier (inspector), then do:

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

Assuming you have a xib file you want to do:

UIViewController *vc = [[UIViewController alloc] initWithNibName:@"NIBNAME" bundle:nil];
[self.navigationController pushViewController:vc animated:YES];

Without a xib file:

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