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POMultiple UIViewController working at the same time?
 

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    <p>Is the possible for multiple UIViewControllers working at the same time? Consider the following window:</p> <pre><code> +-----------------+ | +-----+ | | | | | | | A | C | | | | | | +-----+ | | | | +-----+ | | | B | | | +-----+ | | | +-----------------+ </code></pre> <p><code>C</code> is the first UIViewController added to the window. </p> <p>In viewDidLoad of C_ViewController, I added a NIB (A) by:</p> <pre><code>A_ViewController *avc = [[A_ViewController alloc] initWithNibName:@"A_ViewController" bundle:nil]; [self.view addSubview:avc.view]; [avc release]; </code></pre> <p>A_ViewController is loaded and shown properly. However, if linking any event from the A_ViewController.xib to IBOutlet in A_ViewController.m (e.g. buttonClick), there is an error when the event is fired:</p> <blockquote> <p>*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString buttonClicked:]: unrecognized selector sent to instance 0x5937a40'</p> </blockquote> <p>The question, is it possible to have multiple UIViewController working at the same time? In this example, one for <code>C</code>, one for <code>A</code> and one for <code>B</code>.</p> <p>ADDED: the header file of C_ViewController</p> <pre><code> @class A_ViewController; @interface C_ViewController : UIViewController { A_ViewController *avc; } @property (nonatomic, retain) IBOutlet A_ViewController *avc; @end </code></pre> <p>SOLUTION:</p> <pre><code> A_ViewController *a = [[A_ViewController alloc] initWithNibName:@"A_ViewController" bundle:nil]; [self.view addSubview:a.view]; self.avc = a; // added this to fix!! Thanks [a release]; </code></pre>
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