Terminating app due to uncaught exception, while loading a view - iphone

Question

I am getting this error, while I am trying to load another view
* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-
[__NSCFType new1:]: unrecognized selector sent to instance 0x5c27950'
Here new1 is a button, which when pressed loads a view.
And here is the code inside the new1
-(IBAction) new1:(id) sender
{
viewController = [[iTViewController alloc] initWithNibName:#"iTViewController" bundle:[NSBundle mainBundle]];
[self.view addSubview:viewController.view];
}
Note: When I launch the App from fresh and press the new1 button, it works flawlessly, but when I press other button which loads other view and when I return back to this view and press new1, then it crashes

Answer 1

The error * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '- [__NSCFType new1:]: unrecognized selector sent to instance 0x5c27950' may not be coming from inside the - (IBAction)new1:(id)sender method. What that error is saying is that you are trying to call a non-existent method on whatever object is at the address 0x5c27950. Here are a few possible solutions:
Set NSZombieEnabled, malloc stack logging, and guard malloc in the debugger. Then, when your App crashes, type this in the gdb comsole:
(gdb) info malloc-history 0x5c27950
Replace 0x5c27950 with the address of the object that the stack trace says caused the crash,and it will give you a much more useful stack trace and it should highlight the exact line that is causing the problem.
Check out this article for more info on NSZombieEnabled.
This one for MallocStackLogging info
More info on guard malloc here
Also, have you tried pushing the view controller (assuming your using a navigation controller):
- (IBAction)new1:(id)sender {
iTViewController *viewController = [[iTViewController alloc] initWithNibName:#"iTViewController" bundle:nil];
[self.navigationController pushViewController:viewController animated:YES];
[viewController release];
}
Or, if you are not using a nav controller, you can present it modally:
- (IBAction)new1:(id)sender {
iTViewController *viewController = [[iTViewController alloc] initWithNibName:#"iTViewController" bundle:nil];
[self presentModalViewController:viewController animated:YES];
[viewController release];
}
Another possibility is that you are calling [self new1:someButton]; but the method is not declared in your header file like so:
#interface MyViewController: UIViewController {
........
}
- (IBAction)new1:(id)sender;
#end