How to access method linked to UIBarButton on NavigationController - iphone

Question

II wanted to add a UIBarButton to my UINavigationController. I did that with the help of following code,
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
UIViewController *rootController = [[RootViewController alloc] initWithNibName:#"RootViewController" bundle:nil];
self.navigationController = [[UINavigationController alloc] initWithRootViewController:rootController];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[self.window addSubview:navigationController.view];
[self.window makeKeyAndVisible];
return YES;
}
- (void)viewDidLoad
{
[super viewDidLoad];
UIBarButtonItem *addInfoButton = [[UIBarButtonItem alloc] initWithTitle:#"Add Info" style:UIBarButtonItemStylePlain target:self action:#selector(addCustomerInfo)];
self.navigationItem.rightBarButtonItem = addInfoButton;
}
-(void) addCustomerInfo
{
AddInfoViewController *addVC = [[AddInfoViewController alloc] initWithNibName:#"AddInfoViewController" bundle:nil];
[addVC setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
[self presentModalViewController:addVC animated:YES];
}
Should I declare "-(void) addCustomerInfo" in .h file? I already tried that but no luck.
The code still throws the exeption,
2012-08-06 04:16:22.200 TableView[5698:f803] -[RootViewController addCustomerInfo]: unrecognized selector sent to instance 0x6c662b0
2012-08-06 04:16:22.202 TableView[5698:f803] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[RootViewController addCustomerInfo]: unrecognized selector sent to instance 0x6c662b0'

Answer 1

The code for your class is correct. You need to change your App Delegate
I suggest creating a property in your App Delegate to store your navigation controller -#property (strong, nonatomic) UINavigationController *navController; - Don't forget to synthesize it.
Then, when you create your Navigation controller, set it to your property - self.navController = [[UINavigationController alloc] init];
This will guarantee your NavigationController is properly retained and that it can be accessed correctly by other classes in your application.
Below some sample code that might make it clearer:
First the AppDelegate header file:
//AppDelegate.h
#import <UIKit/UIKit.h>
#interface AppDelegate : UIResponder <UIApplicationDelegate>
{
UINavigationController *navController;
}
#property (strong, nonatomic) UIWindow *window;
#property (strong, nonatomic) UINavigationController *navController;
#end
And the implementation file:
// AppDelegate.m
#import "AppDelegate.h"
#implementation AppDelegate
#synthesize window = _window;
#synthesize navController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.navController = [[UINavigationController alloc] init];
UIViewController *myVC= [[myVC alloc] init];
[self.navController pushViewController:myVC animated:NO];
[self.window addSubview:navController.view];
[self.window makeKeyAndVisible];
return YES;
}

Answer 2

Check out this tutorial:
http://www.innovatelabs.in/2010/03/implementing-uibarbuttonitem/
I'm not so fluent with iOS, but usually when you use a selector, your add : to it #selector(addCustomInfo:)
and then the function would look like this:
-(void) addCustomInfo:(UIBarButtonItem *)myButton {
NSLog(#"YOU CLICKED ME!");
}