NavigationController not showing on UIViewController presenting modally - iphone

Question

Have a mainviewcontroller and on it have UIToolbar which has a UIBarButtonItem Info which shows UIViewcontroller modally.
Now when pressing Infobutton it is showing UIViewController modally which has UITextView but not showing UINavigationController with Done button.
I am not able to figure it out what i am missing in my code.
This is how i am showing UITextView and NavigationController in UIViewController modally.
#import "ModalViewController.h"
#import <QuartzCore/QuartzCore.h>
#implementation ModalViewController
#synthesize textView;
#synthesize navBar;
#synthesize navigationController;
#synthesize delegate;
-(void)dealloc
{
[textView release];
[navBar release];
[navigationController release];
[super dealloc];
}
- (void) viewDidLoad
{
[super viewDidLoad];
self.title = #"Info";
UINavigationController *navigationController = [[UINavigationController alloc]init];
//initWithRootViewController:viewController];
self.navigationController.navigationBar.tintColor = [UIColor brownColor];
self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:#selector(Done:)] autorelease];
self.textView = [[[UITextView alloc] initWithFrame:CGRectMake(0, 0, 320, 416)]autorelease];
self.textView.textColor = [UIColor whiteColor];
self.textView.font = [UIFont fontWithName:#"Georgia-BoldItalic" size:14];
//self.textView.delegate = self;
self.textView.backgroundColor = [UIColor brownColor];
self.textView.layer.borderWidth = 1;
self.textView.layer.borderColor = [[UIColor whiteColor] CGColor];
self.textView.layer.cornerRadius = 1;
self.textView.textAlignment = UITextAlignmentCenter;
self.textView.text = #"This is UITextView presenting modally.\nThis is UITextView presenting modally.\nThis is UITextView presenting modally.\nThis is UITextView presenting modally.\nThis is UITextView presenting modally.\nThis is UITextView presenting modally.
self.textView.editable = NO;
//[self.view addSubview:navigationController.view];
[self.view addSubview: self.textView];
//[navigationController release];
}
And this is how UIViewController presented modally
//Create a final modal view controller
UIButton *modalViewButton = [UIButton buttonWithType:UIButtonTypeInfoLight];
[modalViewButton addTarget:self action:#selector(modalViewAction:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *modalBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:modalViewButton];
self.navigationItem.rightBarButtonItem = modalBarButtonItem;
- (void) modalViewAction:(id)sender
{
self.view = [[[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]]autorelease];
//self.viewController = [[ModalViewController alloc] init];
[self.view setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
//ModalViewController *myModalViewController = [[ModalViewController alloc] init];
//UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:myModalViewController];
//navigationController.navigationBar.tintColor = [UIColor brownColor];
_viewController = [[ModalViewController alloc] init];
//[navigationController pushViewController:_viewController animated:YES];
[self presentModalViewController:self.viewController animated:YES];
//[self.view addSubview:navigationController.view];
//[navigationController release];
[myModalViewController release];
}
I will appreciate if you can figure out what i m doing wrong or missing in my code.
Thanks a lot.

Answer 1

This seems like a needlessly convoluted way of displaying the new controller. In my apps, I do it like this:
//this function displays (modally) view controller nested inside a navcontroller
- (void) showModalController
{
YourViewController * ecreator = [[YourViewController alloc] initWithNibName:#"YourViewController" bundle:nil];
UINavigationController * navcontrol = [[UINavigationController alloc] initWithRootViewController: ecreator];
[self presentModalViewController: navcontrol animated:YES];
[navcontrol release];
[ecreator release];
}
Now you want to do the graphical setup (navbar color etc) in the initWithNib and/or viewDidLoad functions of the YourViewController.

Answer 2

#synthesize navigationController;
so navigationController is your class member variable.
in the function
- (void) viewDidLoad
you declare a local variable
UINavigationController *navigationController
Please notice that the second navigationController is different from your member variable navigationController .
So, inside viewDidLoad you need to create object of your member variable navigationController. Not the local variable navigationController.
Do not RE-declare navigationController in viewDidLoad. Instead, create the object using member variable like:
navigationController = [[UINavigationController alloc]init];

Answer 3

Try this, it worked great for me. I had the exact same problem
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if([segue.identifier isEqualToString:#“segue_name"])
{
UINavigationController *nav = [segue destinationViewController];
ExampleViewController *exampleVC = (ExampleViewController *) nav.topViewController;
//Setup any properties here and segue
}
}