CODEWITHSUNDEEP
iphoneobjective-ciosuinavigationcontrollerpushviewcontroller
Oleg
Oleg

Reputation: 1393

application crashed when I pushing new view controller to self.navigation controller

I have an iOS 5 application. When I want to push view to my navigation controller, the application crashes :(

Here's my appDelegate part:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.


    self.navigationController=[[UINavigationController alloc] init];

    StartViewController *startViewController=[[StartViewController alloc] init];
    [self.navigationController pushViewController:startViewController animated:YES];
    [self.navigationController setNavigationBarHidden:YES];
    [[UIApplication sharedApplication] setStatusBarHidden:YES];

    self.window.backgroundColor = [UIColor whiteColor];
    self.window.rootViewController=self.navigationController;
    [self.window makeKeyAndVisible];
    return YES;
}

Here's my pushing new view controller method:

-(IBAction)startPressed:(id)sender
{
    NSLog(@"startPressed: called");
    //loading RootViewController (mainscreen view)
    RootViewController *rootViewController=[[RootViewController alloc] init];
    [self.navigationController pushViewController:rootViewController animated:YES];
}

Application crashed at a string [self.navigationController pushViewController:rootViewController animated:YES];

Help me, please. How to solve this problem?

Upvotes: 1

Views: 4871

Answers (5)

ostap_holub
ostap_holub

Reputation: 585

I also have some issue with pushViewController. I checked all target memberships and obtain that my xib file wasn't added to necessary target. This helps me. I think you also should check your xib file.

Upvotes: 0

Oleg
Oleg

Reputation: 1393

Solved the problem. I changed `[self.navigationController pushViewController:vc animated:NO] and debug gave me the warning that the view outlet was not set. So I connected view from interface builder and the problem is gone. Thanks everybody for help

Upvotes: 3

kubo
kubo

Reputation: 492

i have same problem with pushViewController but when i try something like this

UINavigationController *rootViewController = (UINavigationController *)[[[UIApplication sharedApplication] keyWindow] rootViewController];
NSLog(@"NavControler:%@, %@", self.navigationController, rootViewController);

i get the same pointres, and the NSArray have 1 item. The problem is somewhere else.

If someone can help and add some code that will work to pushViewController because i have the correct NavigationController but when i try to push the ViewControler i get error

  ViewController* NextView = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
UINavigationController *rootViewController = (UINavigationController *)[[[UIApplication sharedApplication] keyWindow] rootViewController];
[rootViewController pushViewController:NextView animated:YES];

Please could someone explained this issues for me.

Upvotes: 1

gsempe
gsempe

Reputation: 5499

It's a strange way to deal with UINavigationController. In your case I would like to know if it works if you change 

self.navigationController=[[UINavigationController alloc] init];

StartViewController *startViewController=[[StartViewController alloc] init];
[self.navigationController pushViewController:startViewController animated:YES];

to

StartViewController *startViewController=[[StartViewController alloc] init];
self.navigationController=[[UINavigationController alloc] initWithRootViewController:startViewController];

If your app still crashes, it would be interesting to know if you override -loadView method of StartViewController class as you don't initialize it with – initWithNibName:bundle:

Upvotes: 1

rckoenes
rckoenes

Reputation: 69459

A UINavigationController wants a rootviewController:

StartViewController *startViewController=[[StartViewController alloc] init];
self.navigationController=[[UINavigationController alloc] initWithRootViewControllr:startViewController];

[self.navigationController setNavigationBarHidden:YES];
[[UIApplication sharedApplication] setStatusBarHidden:YES];

Change the 

@autoreleasepool { 
     return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); 
}

to 

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
int retVal = UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); 
[pool release];

return retVal;

Upvotes: 4

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