copywithzone – Tarik Billa

[UILabel copyWithZone:]: unrecognized selector sent to instance

March 19, 2023 by Tarik

I guess this was one of those weird bugs with Xcode that you can’t trace or reproduce every time. I narrowed the issue down to one specific UILabel in the IB. As soon as I connect it to an IBOutlet UILabel *, I get this error. On further investigation, it turns out that name title … Read more

Best practice when implementing copyWithZone:

February 8, 2023 by Tarik

You should always use [[self class] allocWithZone:zone] to make sure you are creating a copy using the appropriate class. The example you give for 002 shows exactly why: Subclasses will call [super copyWithZone:zone] and expect to get back an instance of the appropriate class, not an instance of the super class. I access the ivars … Read more