Question

I have added navigation controller into my appication in didFinishLaunchingWithOptions like this

LoginViewController *mainView = [[[LoginViewController alloc]initWithNibName:@"LoginViewController" bundle:nil] autorelease];
navigationController = [[[UINavigationController alloc]initWithRootViewController:mainView]autorelease];
[self.window addSubview:navigationController.view];
[self.window makeKeyAndVisible];

And in my LoginViewController’s viewDidLoad i have,

self.navigationItem.hidesBackButton = YES;
[super viewDidLoad];

UIImage *img = [[UIImage alloc] init];
img = [UIImage imageNamed:@"top_bar.png"];
bar = [self.navigationController navigationBar];
[bar setBackgroundImage:img forBarMetrics:UIBarMetricsDefault];

UIImage *signIn = [UIImage imageNamed:@"signin_btn.png"];
UIButton *phButton = [UIButton buttonWithType:UIButtonTypeCustom];
[phButton setImage:signIn forState:UIControlStateNormal];
phButton.frame = CGRectMake(0.0, 0.0, signIn.size.width, signIn.size.height);
UIBarButtonItem *phBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:phButton];
self.navigationItem.rightBarButtonItem = phBarButtonItem;
[phButton addTarget:self action:@selector(checkConnection) forControlEvents:UIControlEventTouchUpInside];
[phButton release];

When i run the app in my phone it crashes. When i remove the navigationcontroller from the appDelagate it works… Y cant i get my navigation to work properly and how can i avaoid it from getting crashed.

Answer 1

Modify your code

try this code
Declare appdelete.h file

@class LoginViewController;  

LoginViewController *viewController; 
@property (nonatomic, retain) IBOutlet LoginViewController *viewController;

appdelegate.m file declare

@synthesize viewController; 

in didFinishLaunchingWithOptions

UINavigationController *nav=[[UINavigationController alloc] initWithRootViewController:viewController];
[window addSubview:nav.view];
[window makeKeyAndVisible];
return YES;

  -(void) dealloc
 {
 [viewController release]; 
 ......//some code
 }