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PONavigation controller push nil view controller error
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  1. PONavigation controller push nil view controller error
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    copied!<p>I'm having some problems with a Navigation controller in my app. Moving from the RootViewController to a UITableViewController works fine. I now want to have one more level of drilldown, so users pick an item from the list and a new screen appears, like this:</p> <p><code>RootViewController --&gt; TableViewController --&gt; ItemViewController</code></p> <p>I've used the exact same code that switches the first views, but I get:</p> <p><code>Application tried to push a nil view controller on target &lt;UINavigationController...</code></p> <p>The code is identical to the first one, so how can it be nil?</p> <p>In RootViewController.h:</p> <pre><code>@interface RootViewController : UIViewController { IBOutlet TableViewController *tableViewController; } @property (nonatomic, retain) TableViewController * tableViewController; </code></pre> <p>In the .m file I synthesize the property and then use a button to call:</p> <p><code>[self.navigationController pushViewController:tableViewController animated:YES];</code></p> <p>In TableViewController.h:</p> <pre><code>#import "ItemDetailViewController.h" @class TableViewController; @interface TableViewController : UITableViewController { IBOutlet ItemDetailViewController * itemDetailViewController; } @property (nonatomic, retain) ItemDetailViewController * itemDetailViewController; @end </code></pre> <p>And again, I synthesize it in the .m file and use code to push the new view in <code>didSelectRowAtIndexPath:</code></p> <p><code>[self.navigationController pushViewController:itemDetailViewController animated:YES];</code></p> <p>When you tap on an item I get the error message above. Does anyone have any idea why this is happening?</p>
 

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