Iphone : unrecognized selector sent to instance & viewDidLoad isn't running - iphone

Question

I'm developing an application.
I used a TabBar and every tab have its Class (FirstViewController, SecondViewController, ... )
There is one AppDelegate too.
When I launch the program, the first Class is running.
When i select the second tab, the Secondview.xib 's running but the "viewDidLoad" isn't working.
When I select the third Tab, that's the same.
I've put some buttons on the third tab, and when I push it, I have a
> -[UIViewController testAuthentication:]: unrecognized selector sent to instance 0x5f16920
2011-04-08 13:46:42.511 e-mars[19501:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController testAuthentication:]: unrecognized selector sent to instance 0x5f16920'
Here's the code of my classes
SecondViewController.h
#import <UIKit/UIKit.h>
#interface SecondViewController : UIViewController {
}
#end
SecondViewController.m
#import "SecondViewController.h"
#implementation SecondViewController
- (void)viewDidLoad {
[super viewDidLoad];
NSLog(#"viewDidLoad de SecondViewController");
NSURL *url = [NSURL URLWithString: #"http://iosdevelopertips.com/images/logo-iphone-dev-tips.png"];
UIImage *image = [UIImage imageWithData: [NSData dataWithContentsOfURL:url]];
[self.view addSubview:[[UIImageView alloc] initWithImage:image]];
}
- (void)dealloc {
[super dealloc];
}
#end
ThirdViewController.h
#import <UIKit/UIKit.h>
#interface ThirdViewController : UIViewController {
IBOutlet UITextField *login;
IBOutlet UITextField *motdepasse;
NSMutableData *responseData;
}
#property (retain, nonatomic) UITextField *login;
#property (retain, nonatomic) UITextField *motdepasse;
#property (retain, nonatomic) NSMutableData *responseData;
- (IBAction) testAuthentication: (id)sender;
- (IBAction) saveAuthentication: (id)sender;
#end
ThirdViewController.m
#import "ThirdViewController.h"
#implementation ThirdViewController
#synthesize login;
#synthesize motdepasse;
#synthesize responseData;
- (id)initWithFrame:(CGRect)frame {
//if ((self = [super initWithFrame:frame])) {
// Initialization code
//}
return self;
}
-(IBAction) testAuthentication: (id)sender {
//NSLog(#"testAuthentication");
}
- (IBAction) saveAuthentication: (id)sender {
NSLog(#"saveAuthentication");
}
- (void)dealloc {
[login dealloc];
[motdepasse dealloc];
[responseData dealloc];
[super dealloc];
}
#end

Answer 1

Your third ViewController doesn't actually create an instance, so no instance methods can be called upon it. Fix your initWithFrame: method. Remember: instance methods start with the '-' sign, class methods start with the '+' sign.
- (id)initWithFrame:(CGRect)frame {
self = [super initWithNibName:nil bundle:nil];
if (self)) {
// Initialization code
}
return self;
}
- (id)initWithNibName:(NSString *)nibName bundle:(NSBundle *)nibBundle
{
return [self initWithFrame:CGRectZero];
}
- (id)init
{
return [self initWithFrame:CGRectZero];
}
After you fixed this, at least the viewDidLoad method in the third ViewController should work.
With regards to the second ViewController, could you please show the code you use to instantiate the ViewController?
Edit: I've made some changed to make sure initWithFrame: is always called upon initialization, just in case you create the instance using another method (initWithNibName:bundle: or init), now initWithFrame: has become the designated initializer.

Answer 2

Set class in Viewcontroller.
and then try.

Answer 3

Check the Object On which your are calling testAuthentication
May be you are calling testAuthentication on secondViewController's object , Just check and let us know

Answer 4

First time alone the viewController will come from viewDidLoad after that it does not call viewDidLoad instead it calls viewWillAppear. so you can code whatever you want in viewWillAppear.