UIAlertView delegate method crashing - iphone

Question

In my iPhone app, I have a NSObjectA class and a UIViewController B class. I want to call a instance method in B class from A. I used the following code.
Bclass *vc = [[Bclass alloc]init];
[vc hideAlert:NSString];
[vc release];
and in B class:
- (void)hideAlert:(NSString*)message{
UIAlertView *shareAlrt = [[UIAlertView alloc] initWithTitle:#""
message:message
delegate:self
cancelButtonTitle:#"Ok"
otherButtonTitles:nil];
[shareAlrt show];
[shareAlrt release];
}
and the method called and show a AlertView. When click on the Ok button, I want to navigate to class Cclass.
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0)
{
Cclass *vc = [[Cclass alloc]initWithNibName:#"Cclass" bundle:[NSBundle mainBundle]];
[self presentModalViewController:vc animated:NO];
[vc release];
}
}
But when I click on the Ok button, the app crashes. Whats happening here? I have added <UIAlertViewDelegate> in the B class.h file, but still the same error. Please help
I am getting the error code *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFType alertView:clickedButtonAtIndex:]: unrecognized selector sent to instance 0x81baa80'

Answer 1

Just change the method
- (void)hideAlert:(NSString*)message{
UIAlertView *shareAlrt = [[UIAlertView alloc] initWithTitle:#""
message:message
delegate:self
cancelButtonTitle:nil
otherButtonTitles:#"Ok",nil];
[shareAlrt show];
[shareAlrt release];
}

Answer 2

This has been answered by presuming that u have no other button except cancel button titled as "OK". Assumption is made by seeing your displayed code.
You have used Cancel button on which u cant handle delegate to perform any action.
If you look at the documentation of UIAlertViewDelegate class reference
Optionally, you can implement the alertViewCancel: method to take the
appropriate action when the system cancels your alert view. If the
delegate does not implement this method, the default behavior is to
simulate the user clicking the cancel button and closing the view.