[IOS]装载Storyboard中的ViewController

如上图所示，如何装载Storyboard中指定的ViewController?

首先，需要指定ViewController的ID，如上图右上方红色方框内的Storyboard ID。然后使用下面的代码：

或者使用下面的代码：

1. UIStoryboard* mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle:nil];  
2. LeftViewController *leftController = [mainStoryboard instantiateViewControllerWithIdentifier:@"leftViewController"];

1. UIStoryboard* mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle:nil];  
2. ViewController *leftController = [mainStoryboard instantiateViewControllerWithIdentifier:@"leftViewController"];  
3. UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:leftController];