If I have a method to attach an animation to an UI Element
, instead of copy/pasting the code for this method into many viewcontrollers
, can I just create one class
to hold the method and then import it?
I assume it doesn't make sense to use a category
in this instance because I need this method in multiple viewcontrollers
, and a category
is an extension of a single viewcontroller
.
A category is an extension of a class, not of a specific instance of a class. And, any modification that a category makes to a class is available to all subclasses (as with other methods on classes in OOP).
So, if you add a category on NSObject
, basically all classes in your entire app have access to the methods in that category - hence you need to be very careful what methods you add there.
Whether you add a category or a helper class is personal preference in a lot of cases, both will work.
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