UIViewController in a UIView

Question

Can I load a UiViewController in a UIView in another UIViewcontrller.

suppose UIViewControllerA has a UIView named subuiview. Can I load UIViewControllerB into subbuiview?

Thanks!

Answer 1

Starting with iOS 5

"Container view controllers" have been added in iOS 5. You can add a view controller as a child of another one with addChildViewController: .
You also are responsible for adding its view to its parent's view.

Everything is well documented in the iOS SDK documentation: Implementing a Custom Container View Controller .

To add a child view controller:

childViewController.frame = ...
[self.view addSubview:childViewController.view];
[self addChildViewController:childViewController];
[childViewController didMoveToParentViewController:self];

and to remove it:

[self willMoveToParentViewController:nil];
[self.view removeFromSuperview];
[self removeFromParentViewController];

Prior to iOS 5

It's possible to load another view controller and add its view as a subview of another controller's view.

UIViewController *subController = ...
[self.view addSubview:subController.view];

Although it's not recommended by Apple's guidelines:

Each custom view controller object you create is responsible for managing all of the views in a single view hierarchy. [...] The one-to-one correspondence between a view controller and the views in its view hierarchy is the key design consideration. You should not use multiple custom view controllers to manage different portions of the same view hierarchy.

(from the View Controller Programming Guide )

Your sub-controller won't receive rotation events, or viewWillAppear , viewWillDisappear , etc (except viewDidLoad ).

So Apple advises us to use a single view controller managing the entire view hierarchy (but doesn't forbid to use multiple ones).

Each view may still be a custom subclass of UIView. Maybe you don't need another view controller but rather a custom view.

Answer 2

It has always been problematic to simply use addSubview to add a view controller's view as a subview of another's. It's especially bad when people use it to transition between views, rather than relying upon other, more robust, solutions like presentViewController or pushViewController .

If you really want to add one view controller's view as a subview of another's, iOS5 introduced "view controller containment". Containment is discussed in the View Controller Programming Guide as well as WWDC 2011 session 102 . Bottom line, you want to ensure you keep your view controller hierarchy synchronized with your view hierarchy, by calls to addChildViewController , didMoveToParentViewController , etc. See the documentation and the video for specifics.

Answer 3

[self addSubview:viewControllerB.view];

在子视图中尝试这个

Answer 4

Well you cant technically load a viewcontroller. You can load a viewcontroller's view as a subview of any view.

You need to also retain the view controller incase you have any actions attached to it. Otherwise it may result in crashes.

addsubview:controller.view is the method you want to look at.