Suppose I have one table view controller (controlling a static table view) and another regular view controller.
I want to add a common property to both of them. The first thing came in my mind is subclassing, meaning let these two controllers derive from a common abstract super class. After pondering a bit, I recall protocol can also achieve this.
My questions is, which approach will be the correct practice, or there are better practices?
Subclassing is likely the correct approach. Protocols don't add properties automatically, they only dictate that if your class conforms to a specific one that the class implements them. If your coming from the Java world then an interface would be the equivalent.
A category might be appropriate if you want to add common functionality (methods) to all instance of a class, such as a UITableview controller. The downside is that you can't declare additional instance variables (or properties) via a category (well technically you can via associated objects, but that's another rabbit hole).
