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Question by joshlee · Nov 22, 2018 at 03:18 PM · components

How do I write a function that will work with multiple components?

I'm working on a grid game. When a cursor is over an Ally, Enemy, Item, etc... it should do different things depending on the type of component. Is there a better way than writing a bunch of statements like this for each component?

 if(gameobject.GetComponenet<Ally>()) {
 // do something
 }

I've seen something like

 gameObject.GetComponenet<T>();

before, but I don't know how that works.

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Answer by s_awali · Nov 22, 2018 at 03:36 PM

You can use Interface or Abstract class depending of your needs. In your case, I would suggest you to go for an interface called ICursorHoverAction such as this :

 public interface ICursorHoverAction
 {
     void OnCursorHover();
 }

That way, you can simply do this in your grid:

 ICursorHoverAction target = gameobject.GetComponenet<ICursorHoverAction>()
 if(target != null) 
 {
     target.OnCursorHover();
 }

Now, when a class needs to react when the mouse hover over it, it only needs to implement that interface. For more info, see Unity's tutorial on interfaces.

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