Trouble with buttons on UIAlertView iOS initWithTitle:message:delegate:

hey guys, I'm trying to work an If Else statement into my AlertView with little prevail. What I want is to have the AlertView dismissed when the user taps "cancel" so that my ImagePickerController is back how it was before the AlertView. And when the user taps "Leave" I would like the imagePickerConroller to dismiss and the camera/contents to reset and to have the user taken back to my homeViewController which is located at my TabBarController integer:1. Right now when I click on "cancel" or "leave" the alrtView is dismissed and my imagePickerController is displayed again but the "cancel" and "take Photo" button are disabled but still visible. I've tried plugging in many different methods/instances to try to accomplish this but haven't had any luck yet. There's got to be something that I am just not understanding or missing. please help! thanks!-

     -(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Are you Sure?"
                                                    message:@"Leaving means you will not be able to return"
                                                   delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Leave", nil];
[alertView show];

}

 -(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex==1) {
}
else {
}

}