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PO
 

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    <p>You are asking for the 'proper way', as if in OOP there is a single correct answer.</p> <p>In reality there not one correct design. It is all relative to how you expect the code to be extended and repurposed in the future.</p> <p>If you really want to prepare yourself for every imaginable extension, then you'll end up with a ridiculously complicated design, and still not cover it all.</p> <p>In your example: Going from a touch-controlled spinner to something that's part of a 2D physics simulation... that's quite a long jump. Why would I even want to implement that with a common base class?</p> <ul> <li><p>If you just want a baseclass for 'something on the screen that can spin'... I'd say that's too generic. There isn't enough added value to justify a new class for that: UIView can already do that.</p></li> <li><p>If your original object was intended to get user input, then stick to the design pattern of the iOS and subclass UIControl.</p></li> <li><p>If you envision a physics simulation. Then you probably have a whole class structure that is independent of how it is shown on screen:</p></li> </ul> <p>A Rigid class to describe mechanical properties (shape, weight, ...) of each object (possibly a class tree. You can use a separate delegates for collision detection. ) A RigidState, describing position and velocity for a Rigid. A RigidSimulator, owning a set of Rigids and a RigidState for each rigid. A RigidViewController that can creates a UIView (probably an UIImageView) for a given Rigid and can adjust its size and position (given a RigidState). ... Something along those lines. </p>
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    1. POConceptually, how should this be structured in OOP?
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    1. POConceptually, how should this be structured in OOP?
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    1. CODon't worry to much about my first example as that was before I began to think it through in more detail. The physics simulation type scenario sounds more like where I'm currently at.
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    2. COOkay, in that case not a well formulated question :-/. Anyway, I edited my answer somewhat.
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    3. COI sill don't entirely get it lol - but your answer was the best I think
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