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POUINavigationController error crashing my app
 

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  1. POUINavigationController error crashing my app
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    <p>I am trying my first UINavigationController app and it is now crashing. If I comment out the line that starts with navController, I don't crash, but if course the app doesn't work either. </p> <p>(Note: My environment is IOS 4.2 and Xcode 3.2)</p> <pre><code>(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { WpglViewController *firstViewController = [[WpglViewController alloc] init]; navController = [[UINavigationController alloc] initWithRootViewController:firstViewController]; [firstViewController release]; [window addSubview:navController.view]; [self.window makeKeyAndVisible]; return YES; } </code></pre> <p>Here is the crash information. Can someone point me in the right direction? Thanks for the help. <br></p> <pre><code>2011-09-04 07:59:49.309 wpgl[7302:207] -[WpglViewController title]: unrecognized selector sent to instance 0x4b134c0 2011-09-04 07:59:49.313 wpgl[7302:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[WpglViewController title]: unrecognized selector sent to instance 0x4b134c0' *** Call stack at first throw: ( 0 CoreFoundation 0x00ecdbe9 __exceptionPreprocess + 185 1 libobjc.A.dylib 0x00cc25c2 objc_exception_throw + 47 2 CoreFoundation 0x00ecf6fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187 3 CoreFoundation 0x00e3f366 ___forwarding___ + 966 4 CoreFoundation 0x00e3ef22 _CF_forwarding_prep_0 + 50 5 UIKit 0x00375781 -[UINavigationController pushViewController:transition:forceImmediate:] + 743 6 UIKit 0x0036e4a0 -[UINavigationController pushViewController:animated:] + 62 7 UIKit 0x00370d98 -[UINavigationController initWithRootViewController:] + 78 8 wpgl 0x00001df9 -[wpglAppDelegate application:didFinishLaunchingWithOptions:] + 146 9 UIKit 0x002b81fa -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1163 10 UIKit 0x002ba55e -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 439 11 UIKit 0x002c4db2 -[UIApplication handleEvent:withNewEvent:] + 1533 12 UIKit 0x002bd202 -[UIApplication sendEvent:] + 71 13 UIKit 0x002c2732 _UIApplicationHandleEvent + 7576 14 GraphicsServices 0x016e4a36 PurpleEventCallback + 1550 15 CoreFoundation 0x00eaf064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52 16 CoreFoundation 0x00e0f6f7 __CFRunLoopDoSource1 + 215 17 CoreFoundation 0x00e0c983 __CFRunLoopRun + 979 18 CoreFoundation 0x00e0c240 CFRunLoopRunSpecific + 208 19 CoreFoundation 0x00e0c161 CFRunLoopRunInMode + 97 20 UIKit 0x002b9fa8 -[UIApplication _run] + 636 21 UIKit 0x002c642e UIApplicationMain + 1160 22 wpgl 0x00001d44 main + 102 23 wpgl 0x00001cd5 start + 53 ) terminate called after throwing an instance of 'NSException' </code></pre> <p>In my WpglViewController.h file I have the following declared:</p> <pre><code>@interface WpglViewController : NSObject &lt;UIApplicationDelegate&gt; { UILabel *servingsLabel; UILabel *quantityLabel; UINavigationController *navigationController; } @property (nonatomic, retain) IBOutlet UILabel *servingsLabel; @property (nonatomic, retain) IBOutlet UILabel *quantityLabel; @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) UINavigationController *navigationController; @end </code></pre> <p>and in my WpglViewController I have the following declared:</p> <pre><code>#import "WpglViewController.h" @implementation WpglViewController @synthesize servingsLabel; @synthesize quantityLabel; @synthesize navigationController; </code></pre>
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