How to call an implemented custom Interface

Question

Hello. I'm interested in implementing a custom and simple interface to facilitate saving and loading my game. What I want is something like this:

 public interface ISavable
 {
      void OnSave();
 }

And use it like this:

 public class MyObject : MonoBehaviour, ISavable
 {
      public void OnSave()
      {
           //Save variables
      }
 }
 
 public class MyOtherObject : MonoBehaviour, ISavable
 {
      public void OnSave()
      {
           //Save different variables
      }
 }

How would you call this OnSave() on every class that implements ISavable?

I was doing it with a custom event system, but I'd love to know how to implement it this way and make it cleaner, without having to use listeners on OnEnable and OnDisable on every single class I want variables to be saved.

Thanks!

Answer 1

Best Answer

Answer by Hellium · Aug 06, 2018 at 04:15 PM

 public class SaveManager : MonoBehaviour
 {
     private ISavable[] savables;
 
     public void Save()
     {
         if( savables == null ) savables = FindObjectsOfType<ISavable>();
         for( int index = 0 ; index < savables.Length ; ++index )
             savables[index].OnSave();
     }
 }

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DanielErhardt · Aug 06, 2018 at 05:51 PM 0

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That's what I ended up doing!

There's one downside though...

FindObjectsOfType only finds active objects...

I don't remember where I saw it now, but the solution I found was to load all root objects using

 UnityEngine.Scene$$anonymous$$anagement.Scene$$anonymous$$anager.GetActiveScene().GetRootGameObjects()

into an array and then getting all children ISavable from each element using

 GetComponentsInChildren<ISavable>(bool includeInactive)

passing true for includeInactive.

This way I had access to ISavable from every single object in the scene, active or not.

How to call an implemented custom Interface

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