iOS 純代碼跳轉到Xib界面和Storyboard界面

純代碼跳轉到Xib界面或者Storyboard界面，不能按照一般的跳轉寫法來跳轉，會出現空白界面。

//跳轉到Xib界面
MyViewController *vc = [[MyViewController alloc] initWithNibName:@"Xib名字" bundle:[NSBundle mainBundle]];

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

跳轉到Storyboard界面

UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Storyboard名字" bundle:[NSBundle mainBundle]];

MyViewController *vc = [sb instantiateViewControllerWithIdentifier:@"Storyboard ID"];

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