CODEWITHSUNDEEP
iosobjective-cuinavigationcontroller
Mev
Mev

Reputation: 1625

Adding ChildViewController with NavigationController into ContainerController

I am designing a custom UIViewContainerController for a project. I keep a contentView in this container to manage my Childviewcontroller's views. When I add a childviewcontroller alone it works fine. But some of the childviewcontrollers must be initialized with a "navigationcontroller" & that is where I'm having problems with implementation.

I use the usual initWithRootViewController method on "navigationcontroller" to init(initialize) my "childvc" & then how do I add this along with the navigation bar to my contentView?

This is the code I'm using for "childvc" without a "navigationcontroller" & it works fine. 

// in my containerview controller's add childview method. 
ChildViewController1 *vc = [ChildViewController1 new];

[self addChildViewController:vc]; // self = container vc
vc.view.frame = self.contentView.bounds;
[self.contentView addSubview:vc.view]; // contentView is the space i've kept to add childvcs
[vc didMoveToParentViewController:self];

Now when I try to use a "childvc" initialized with "navigationcontroller" (because there is a flow to this "childvc") I get errors & what I need to know is how do I add this to my contentView along with navigation bar. (just like in a tabbarcontroller).

This is the code I use to initialize "childvc" with "nav controller" :

ChildViewController1 *vc = [ChildViewController1 new];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];

I've made public repository with simple project "Here".

I have read doc of tab bar / nav controllers & creating custom container viewcontrollers in apple documentation but seems to be missing something critical. Link is "Here".

Upvotes: 1

Views: 1488

Answers (1)

herzbube
herzbube

Reputation: 13388

From looking at the commented code in your public repo, what you are trying to do is this:

container VC
  +-- navigation VC
  |     +-- child VC
  +-- child VC

This is wrong, the child VC can appear only once in the view controller hierarchy. Your hierarchy should look like this:

container VC
  +-- navigation VC
        +-- child VC

Here's a rough sketch of how the code for setting this up might look like. Notice how the navigation controller (and its view) completely replaces the ChildViewController1.

// Setup the view controller hierarchy - place this inside
// your container VC's initializer
ChildViewController1* vc = [ChildViewController1 new];
// With this statement, vc becomes the child of the navigation controller
UINavigationController* nav = [[UINavigationController alloc] initWithRootViewController:vc];
[self.childViewControllers addObject:nav];
[nav didMoveToParentViewController:self];

// Setup the view hierarchy - place this inside your
// container VC's loadView override
nav.view.frame = self.contentView.bounds;
[self.contentView addSubview:nav.view];

As mentioned in the comments, I suggest that you separate the setup of the view controller hierarchy from the setup of the view hierarchy.

  • A typical place for the view controller setup is during initialization. You can see how UINavigationController does this with its initWithRootViewController: initializer.
  • The canonical place for the view hierarchy setup is in the view controller's loadView override.

Upvotes: 1

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