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Editorial Team
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Asked: 2026-06-02T04:57:31+00:00

A game on iOS is using this: there is a metal ball, and the

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A game on iOS is using this: there is a metal ball, and the ballRect is a property of the Model class, but the corresponding ball which is a UIImageView object, is a property of the ViewController class.

Can this design be made so that both ballRect and ball are properties of the Model class? In other game sample, I see only 2 properties of the ViewController class: the model object and a timer object. That’s it. I wonder why this time, there are extra properties that become the ViewController class and should they go to the Model class?

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1 Answer

  1. Editorial Team

    It would make more sense to make a BallView that holds a pointer to a Ball (Model) and hosts an image view that shows the ball sprite. The BallView should observe the Ball’s ballRect, and when that changes, update its (the BallView’s) frame to match.

    This arrangement would let you add other, similar relationships. For example, if there are different kinds of balls and a ball can change from one kind to another (e.g., for a temporary power-up), the BallView can observe the Ball’s kind and change the image view’s image whenever the Ball’s kind changes.

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