App crash on click of tab button second time [closed] - iphone

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In my app i have tab bar and in it there is three tab button. but on one of it when i pressed it second time it crash the app. Other button are working fine.
This is the .m file code
-(void)viewWillAppear:(BOOL)animated
{
scrollView.contentSize = CGSizeMake(320, 500);
[super viewWillAppear:YES];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.title = NSLocalizedString(#"Contact Us", #"Contact Us");
self.tabBarItem.image = [UIImage imageNamed:#"contactTab.png"];
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
[self.navigationController.navigationBar setTintColor:[UIColor blackColor]];
scrollView.contentSize = CGSizeMake(320, 500);
scrollView.scrollEnabled = YES;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWasShown:)
name:UIKeyboardDidShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[self.view endEditing:YES];
}
-(BOOL) textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
return YES;
}
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView
{
[textView becomeFirstResponder];
return YES;
}
- (void)keyboardWasShown:(NSNotification *)notification
{
// Step 1: Get the size of the keyboard.
CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
// Step 2: Adjust the bottom content inset of your scroll view by the keyboard height.
UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.height, 0.0);
scrollView.contentInset = contentInsets;
scrollView.scrollIndicatorInsets = contentInsets;
// Step 3: Scroll the target text field into view.
CGRect aRect = self.view.frame;
aRect.size.height -= keyboardSize.height;
if (!CGRectContainsPoint(aRect, self.activeTextField.frame.origin) )
{
CGPoint scrollPoint = CGPointMake(0.0, self.activeTextField.frame.origin.y - (keyboardSize.height-15));
[scrollView setContentOffset:scrollPoint animated:YES];
}
}
- (void) keyboardWillHide:(NSNotification *)notification
{
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
scrollView.contentInset = contentInsets;
scrollView.scrollIndicatorInsets = contentInsets;
}
// Set activeTextField to the current active textfield
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
self.activeTextField = textField;
}
// Set activeTextField to nil
- (void)textFieldDidEndEditing:(UITextField *)textField
{
self.activeTextField = nil;
}
// Dismiss the keyboard
- (IBAction)dismissKeyboard:(id)sender
{
[self.activeTextField resignFirstResponder];
}
So which code is crashing my app?
Edited :
AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
tabBarController = [[UITabBarController alloc] init];
//Adding Search,Nearby,Map,AboutUs,Favorites Tabs to tabBarController
HomeViewController * homeViewController = [[HomeViewController alloc] init];
UINavigationController *homeNav = [[UINavigationController alloc] initWithRootViewController:homeViewController];
ContactUsFormViewController *contactUsFormViewController = [[ContactUsFormViewController alloc] init];
UINavigationController *contactNav = [[UINavigationController alloc] initWithRootViewController:contactUsFormViewController];
BookingFormViewController *bookingFormViewController = [[BookingFormViewController alloc] init];
UINavigationController *bookingNav = [[UINavigationController alloc] initWithRootViewController:bookingFormViewController];
NSArray* controllers = [NSArray arrayWithObjects:homeNav,contactNav,bookingNav, nil];
tabBarController.viewControllers = controllers;
[self.window setRootViewController:tabBarController];
sleep(2);
[self.window makeKeyAndVisible];
return YES;
}
Thanks.

Answer 1

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
-(void)viewWillAppear:(BOOL)animated
{
[self.navigationController.navigationBar setTintColor:[UIColor blackColor]];
scrollView.contentSize = CGSizeMake(320, 500);
scrollView.scrollEnabled = YES;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWasShown:)
name:UIKeyboardDidShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];
scrollView.contentSize = CGSizeMake(320, 500);
[super viewWillAppear:YES];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.title = NSLocalizedString(#"Contact Us", #"Contact Us");
self.tabBarItem.image = [UIImage imageNamed:#"contactTab.png"];
}
return self;
}