How can I add an object to a NSMutableArray using a delegate?

Question

I am trying to add an object to an NSMutableArray taskArray. The object is an instance of taskClass called emptyTask. When I create emptyTask and try to add it to myDelegate, I get following error: 'NSInvalidArgumentException', reason: '-[TaskClass copyWithZone:]: unrecognized selector sent to instance 0x8c63f10

myDelegate = [UIApplication sharedApplication].delegate;
myDelegate.taskArray = [[NSMutableArray alloc]init];
TaskClass* emptyTask = [[TaskClass alloc]init];
emptyTask = [emptyTask starterTaskClass];
[myDelegate.taskArray addObject:emptyTask];

I can replace emptyTask with an NSString and it adds to myDelegate. I can also add emptyTask to a locally created NSMutableArray and it works. So it seems it has something to do with my class to myDelegate. I have #import "TaskClass" in all of my header files.

Thoughts?

Answer 1

Something is trying to copy your delegate somewhere down the line, either directly or (more likely) using it as the key in a dictionary. You have a couple options

• Figure out where and change it to not copy/use a dictionary; or
• Implement -[TaskClass copyWithZone:]; as long as you're doing that you may as well declare yourself to conform to the NSCopying protocol.