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POGiving all sub viewcontrollers no matter how many levels deep access to root container
 

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  1. POGiving all sub viewcontrollers no matter how many levels deep access to root container
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    <p>I have achieved this but I am asking more if I did this right. I have been immersed in the apple documentation and iOS programming books. Since then I have fully reworked my app for reusability and all that good stuff.</p> <p>Now I have a main UIViewController named RootController that handles a UINavigationController and a custom MenuController. I decided that UIViewController containment was the best approach for my RootController.</p> <pre><code>RootController ---&gt; UINavigationController ---&gt; MenuController </code></pre> <p>Now a problem occurred where I needed some of the sub UIViewControllers in the UINavigationController to communicate with the main RootController.</p> <pre><code>RootController ---&gt; UINavigationController --&gt; UIViewController ^_____________________________________________| </code></pre> <p>What I decided to do was extend UIViewController with a category.</p> <p>UIViewController+RootController.h</p> <pre><code>@interface UIViewController (RootController) @property (nonatomic, readonly) RootController *rootController; @end </code></pre> <p>UIViewController+RootController.m</p> <pre><code>@implementation UIViewController (RootController) - (RootController *)rootController { static RootController *rootControler; if(rootControler == nil) { UIViewController *vc = self; while((vc = vc.parentViewController)) { if([vc isMemberOfClass:[RootController class]]){ rootControler = (RootController *)vc; break; } } } return rootControler; } @end </code></pre> <p>When [self rootController] is called by any UIViewController it will loop through the parent view controllers until it find one that matches RootController, it will then return the match. I also made the property static so it was only looked up once.</p> <p>So my question is was this the right approach I made? I was trying to make something similar to UIViewController's navigationController method.</p> <p>I need access to the main root controller so I can handle the MenuController from any view within my app.</p>
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    1. USarosolino
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    1. COIt looks technically OK but it might be easier to comment on it if you said why you needed access to the root controller from other controllers.
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      1. USPhillip Mills
    2. COThanks, I have done this.
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      1. USarosolino
 

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