AsyncDisplayKit/containers-asviewcontroller.md at f2933f3d5e5cf680d11cefc13d0098400729d69d

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title, layout, permalink, next

title	layout	permalink	next
ASViewController	docs	/docs/containers-asviewcontroller.html	containers-astablenode.html

ASViewController is a subclass of UIViewController that adds several useful features for hosting ASDisplayNode hierarchies.

An ASViewController can be used in place of any UIViewController - including within a UINavigationController, UITabBarController and UISpitViewController or as a modal view controller.

One of the main benefits to using an ASViewController is to save memory. An ASViewController that goes off screen will automatically reduce the size of the fetch data and display ranges of any of its children. This is key for memory management in large applications.

More features will be added over time, so it is a good idea to base your view controllers off of this class.

A UIViewController provides a view of its own. An ASViewController is assigned a node to manage in its designated initializer initWithNode:.

Consider the following ASViewController subclass PhotoFeedNodeController from the ASDKgram sample app that would like to use a table node as its managed node.

This table node is assigned to the ASViewController in its initWithNode: designated initializer method.

- (instancetype)init
{
  _tableNode = [[ASTableNode alloc] initWithStyle:UITableViewStylePlain];
  self = [super initWithNode:_tableNode];
  
  if (self) {
    _tableNode.dataSource = self;
    _tableNode.delegate = self;
  }
  
  return self;
}

If your app already has a complex view controller hierarchy, it is perfectly fine to have all of them subclass `ASViewController`. That is to say, even if you don't use `ASViewController`'s designated initializer `initiWithNode:`, and only use the `ASViewController` in the manner of a traditional `UIVieWController`, this will give you the additional node support if you choose to adopt it in different areas your application.

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