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PODynamically declare child UiViewController in main UiViewController
 

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    <p>In my program, I have to declare and use the multiple child <code>UIViewController</code> like a custom control in my main <code>UIViewController</code>. But when I click on the button of one of the child UIView Controllers I get a <code>EXC_BAD_ACCESS</code> error. Please see the following my sample code structure.</p> <p>Example 1:</p> <pre><code>//--Child------------------------------------------------------------------- @interface subUIViewController&lt;UIViewController&gt; -(IBAction)myButtonClick:(id)Sender; -@implementation subUiViewController -(IBAction)myButtonClick:(id)Sender { NSLog(@"Button Click Event....."); } //---Main-------------------------------------------------------------------- @interface mainUIViewController&lt;UIViewController&gt; @implementation mainUIViewController -(void)viewDidLoad { [super viewDidLoad]; subUiViewController *subViewController=[[subUiViewController alloc] initWithNibNameAndArtist:@"subUiViewController" bundle:nil]; [self.view addSubView: subViewController.view]; } //--------------------------------------------------------------------------- //--------------------------------------------------------------------------- </code></pre> <p>But if I declare with <code>@property (retain,nonatomic) subUiViewController *subViewController</code> in <code>MainViewController</code>, it is working without error. Please see the following code.</p> <p>Example 2:</p> <pre><code>//---Child------------------------------------------------------------------ @interface subUIViewController&lt;UIViewController&gt; -(IBAction)myButtonClick:(id)Sender; @implementation subUiViewController -(IBAction)myButtonClick:(id)Sender { NSLog(@"Button Click Event....."); } //----Main----------------------------------------------------------------- @interface mainUIViewController&lt;UIViewController&gt; @property(retain,nonatomic) subUiViewController *subViewController; @implementation mainUIViewController @synthesize subViewController; -(void)viewDidLoad { [super viewDidLoad]; subViewController=[[subUiViewController alloc] initWithNibNameAndArtist:@"subUiViewController" bundle:nil]; [self.view addSubView: subViewController.view]; } //--------------------------------------------------------------------------- //--------------------------------------------------------------------------- </code></pre> <p>I don't know why Example 1 is not working and Example 2 is working. For me, I need to use example 1 because I need to programatically create a child ui view controller based on Core Data Return. Could you please help me to point out what is wrong ? How can I dynamically declare child ui view controller in code?</p>
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