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    <p>The issue is that you're creating this controller in your <code>main</code> function, but don't do anything with it and it will fall out of scope (and if using ARC, will be deallocated). Regardless, when the view controller is instantiated during the standard flow of the app, it will create a second instance, this time without having <code>createButton</code> called. So your calling of <code>createButton</code> in <code>main</code> is for naught. This concept of "I create an object in main class just to start it quickly" doesn't pass muster. The creating of the view controller in <code>CreateButtons</code> suffers from an analogous problem.</p> <p>You really need to set the <code>stream</code> property somewhere else (e.g. in the <code>viewDidLoad</code> of <code>PlayVideoController</code> or in the <code>prepareForSegue</code> of the view controller that is segueing to <code>PlayVideoController</code>). But you almost certainly will never call <code>initWithString</code> for <code>PlayVideoController</code> (and you probably can retire that method). </p> <p>If, for example, you're transitioning from <code>ButtonsController</code> view controller to <code>PlayVideoController</code> view controller via a segue with a storyboard identifier of, say <code>playVideo</code>, then you could use <code>prepareForSegue</code> in <code>ButtonsController</code> like so:</p> <pre><code>#import "PlayVideoController.h" - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { if([segue.identifier isEqualToString:@"playVideo"]){ PlayVideoController *controller = (PlayVideoController *)segue.destinationViewController; controller.stream = @"--somestring--"; } } </code></pre> <p>(See the "Passing data forward using segues" section of <a href="https://stackoverflow.com/a/9736559/1271826">this answer about passing data between controllers</a>.)</p> <p>If you want to do something at startup, e.g. initialize some model object structure (but not view controllers), you can do that in your app delegate's <code>didFinishLaunchingWithOptions</code>, but there's nothing shared with us thus far that seems to suggest that this is necessary. But if you do this, make sure you do the necessary memory management to keep it around (e.g. make this model object a property of the app delegate, make it a singleton, etc.). But if you create a local variable and configure it and let it fall out of scope, you'll lose the work you did on that.</p>
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    1. COOk i changed it so i created a new viewController that uses the ButtonsController in my storyboard and added a simple button that does a modal segue when it's pressed to my PlayVideoController. Inside ButtonsController's viewdidload i called the createButton method and so it finished the same way
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    2. CO@user2984676 Yeah, your `createButton` method is yet another example of the same problem, that you're creating `PlayVideoController`, setting `stream`, but again not doing anything with this view controller, so it falls out of scope and is released. I was suggesting that you add a scene to your storyboard with `PlayVideoController` as it's view controller, and then set `self.stream` in `viewDidLoad` of `PlayVideoController`. Or alternatively, you can have `ButtonsController` have a segue to `PlayVideoController` and the `prepareForSegue` in `ButtonsController` can set the `stream` property.
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    3. COBut don't just instantiate a view controller with `initWithString` and then discard that view controller. You don't want to be calling `initWithString` of your `PlayVideoController`, but rather when you segue to that controller, you want to let storyboards do the necessary instantiation for you, and only set the `stream` property in `prepareForSegue`.
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