[__NSCFSet iName]: unrecognized selector sent to instance - iphone

Question

I just do not seem to follow this.
This is my code
-(void)saveClicked:(id)sender{
Item *item=[[Item alloc]init];
item.iName=nameField.text;
if ([appDelegate.list containsObject:item]) {
//currentItem and item are object of class Item
//currentItem was declared in the headerfile and synchronized
currentItem=item;
NSString *msg=[NSString stringWithFormat:#"%# already exists in your Instock list",item.iName];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:msg delegate:self cancelButtonTitle:#"Cancel" otherButtonTitles:#"edit",nil];
[alert show];
[alert release];
}
}
- (void)alertView:(UIAlertView *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex==0) {
}
else {
//getting the error here
NSLog(#"%#",currentItem.iName);
}
}
ERROR:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFSet iName]: unrecognized selector sent to instance 0x5e280b0'
I have no clue why this is happening. Help would be appreciated.

Answer 1

Assume you have currentItem as retain property , Try with using below with your saveClicked:
self.currentItem = item;
So, you code should be ...
-(void)saveClicked:(id)sender{
Item *item=[[Item alloc]init];
item.iName=nameField.text;
if ([appDelegate.list containsObject:item]) {
//currentItem and item are object of class Item
//currentItem was declared in the headerfile and synchronized
self.currentItem = item;
NSString *msg=[NSString stringWithFormat:#"%# already exists in your Instock list",item.iName];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:msg delegate:self cancelButtonTitle:#"Cancel" otherButtonTitles:#"edit",nil];
[alert show];
[alert release];
}
[item release];
}

Answer 2

It doesn't make sense to release item as that would mean you've taken ownership only once and you're relinquishing it. So the currentItem will be pointing to a deallocated object. You will have to take ownership by retaining the object and later releasing it once you're done with the object.