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    <p>From your question title, it seems you are trying to access your controller to get some data back.</p> <p>In this case, my suggestion would be creating a "model" (as in Model-View-Controller) in your design, and make that model accessible from everywhere in your app. An easy way to accomplish the latter point is to make the model class a singleton; or you might make it a class with only class-methods to give access to the data. See also <a href="https://stackoverflow.com/questions/13063984/creating-a-global-class-objective-c/13064008#13064008">this other answer of mine</a> about the same issue for some sample code.</p> <p>After reading your edit, I would suggest the following:</p> <ol> <li><p>add to your <code>contentViewController</code> class a property say it <code>dataSource</code>;</p></li> <li><p><code>dataSource</code> is of type <code>contentViewControllerDataSource</code> and provides the method to access all required data, e.g.:</p> <pre><code>@protocol contentViewControllerDataSource &lt;NSObject&gt; -(NSString*)textViewContent; @end </code></pre></li> <li><p>before adding <code>contentViewController</code> to the page controller, set its <code>dataSource</code> property:</p> <pre><code>initialViewController = [self viewControllerAtIndex:0]; initialViewController.dataSource = self; NSMutableArray *viewControllers = [NSArray arrayWithObject:initialViewController]; [pageController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil]; </code></pre></li> <li><p>let your <code>self</code> controller implement the <code>contentViewControllerDataSource</code> protocol:</p> <pre><code>@interface DonKnowTheNameOfThisOne : UIViewController &lt;contentViewControllerDataSource&gt; .... @implementation DonKnowTheNameOfThisOne; ... - (NSString*)textViewContent { return value; } </code></pre></li> <li><p>from <code>contentViewController</code> you will be able to call:</p> <pre><code>NSString* textViewContent = self.dataSource.textViewContent; </code></pre> <p>or:</p> <pre><code>self.dataSource.textViewContent = @"NEWVAL"; </code></pre></li> </ol> <p>Hope this helps.</p> <p>EDIT:</p> <p>After looking at your files:</p> <p>Please, remove the <code>#import "ViewController.h"</code> directive at the beginning of <code>contentViewController.h</code>. That should fix the problem you had.</p> <p>Another thing: I wrote at point 1 that <code>contentViewController</code> have the property <code>dataSource</code>; <code>ViewController</code> implements the <code>contentViewControllerDataSource</code> protocol and hosts the data that <code>contentViewController</code> would like to access. One class is the "client" of the data; the other "shares" the data through the delegate protocol that you can modify from outside. In your code both the <code>dataSource</code> and the protocol are assigned to the same <code>ViewController</code> class and this makes no sense. So, you can try an fix it: I am not sure now which class should be doing what, but you will know, I hope.</p>
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