Calling method in AppController from a ViewController - objective-c

Question

I'm trying to build a Cocoa app for OSX Lion.
I have this line in my AppController code:
self.viewController = [[LoginViewController alloc] initWithNibName:#"LoginViewController" bundle:nil appController:self];
[_view addSubview:[_viewController view]];
[[_viewController view] setFrame:[_view bounds]];
LoginViewController looks like this:
#implementation LoginViewController
#synthesize appController = _appController;
- (id) initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil appController:(AppController *)appController {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
[self setAppController:appController];
NSLog(#"Appcontroller init: %#", _appController);
}
return self;
}
- (IBAction)login:(id)sender {
NSLog(#"Appcontroller login: %#", _appController);
}
The login method is connected to a button click.
Log:
2012-05-23 12:45:49.574 QBLoader[3241:503] Appcontroller init: <AppController: 0x7fe2ab210440>
2012-05-23 12:45:52.085 QBLoader[3241:503] Appcontroller login: (null)
Why is the second log line null?

Answer 1

Since you indicated there is more than one instance of LoginViewController, I would check your xibs to see if you have created an object of that type anywhere. In particular I would start with the xib where you wire up the -login: action. If you only have one instance of AppController, a common method is to create the object in your MainMenu.xib and attach it to an outlet in your app's delegate. Then you can use something like [[NSApp delegate] appController] to access it.