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    <p>Well, wenn the view controllers in a tab bar have (or better are) navigation controllers, then the <code>viewControllers</code> array of the tab bar controller contains navigation controllers instead. Actually, you (or your storyboard) put them in! It may well be a mix of view controllers and navigation controllers, depending of what was actually set upon creation or reconfiguration (if any) of the tab bar. </p> <p>So I'd sugest to receive the object from <code>viewContollers</code> at the given index into something of type ID. Then check whether it is a navigation controller (use <code>isKindOfClass:[iPhone_ASRAViewController class]</code>) and if so then use it directly. If not then check whether it is of class UINavigationConroller (or the other way around - what ever is more convenient for you) and if so fetch its topViewController property and go from there. </p> <p>Edit: Added in response to comments: </p> <pre><code>id someController = [self.tabBarController.viewControllers objectAtIndex:3]; if (someController isKindOfClass:[UINavigationController class]) { someController = [someController topViewController]; //re-using someController } // someController should be a UIViewController from here onwards. But you may double check if you want. if (someController isKindOfClass:[iPhone_ASRAViewController class]) { iPhone_ASRAViewController *myIPhone_ASRAViewController (iPhone_ASRAViewController*) someController; // you may now savely access those properties that are unique to your custom view controller class } </code></pre>
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    1. POHow to access a property declared in a viewController which is assigned to UINavigationController?
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    1. USHermann Klecker
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    1. POHow to access a property declared in a viewController which is assigned to UINavigationController?
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    1. COThank for your suggestions. Because I am the beginner of objc,so I didn't got your point about "receive the object from viewContollers". Can you describe it in more detail? I am so grateful for your help. On the other hand, I found that When I declare a new instance of iPhone_ASRAViewController in the FirstViewController to access the stu_id. This method seems to conflict with navController1 I declared in the AppDelegate.m.
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    2. COI meant to access the `viewControllers` property of the UITabBarController and get the 3rd (in your example) Element. You did that alreay. All what I suggest is to store it in an `id` type varualbe at first and then check, whether it is a navigation controller or a view controller (respectively your subclass of `UIViewController`). In your case it could be that it is always a navigation controller. But checking upon that is a more general and therefore less error prone and reusable approach.
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    3. COI'll add some sample code to the answer.
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