What is your own method to share data between script ?

Question

Hi,

When you have some datas (by data I mean variables) you want share them in many scripts, what do you do ?

I don't know if I should create a static class to gather all datas or create a Script and attach it to a kind of "Master GameObject" in my scene and catch him after with GetComponent() ?

None of these two methods seems right to me... so what is your own method to share data between script ?

Answer 1

Answer by delstrega · Jul 03, 2012 at 03:56 PM

Actually, if you have a static class and use static variables you don't have to "find" it or use GetComponent(). You can access the vars directly through the classname. At least that's the way I do it. You might want to take a look at a Singleton approach:

http://unifycommunity.com/wiki/index.php?title=Singleton http://unifycommunity.com/wiki/index.php?title=AManagerClass

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Answer 2

Answer by ahsen35813 · Mar 27, 2020 at 10:45 PM

Actually, this can be done quite easily. The solution can be found here: https://answers.unity.com/questions/42843/referencing-non-static-variables-from-another-scri.html I certainly found it extremely helpful, and it should answer your question.

In a nutshell, make the variable you want to access from the other script public like this:

 public float myVariable = 3.14159;

Then, you need to put this code in the script that will be acessing that public variable

 private float myOtherVariable;
 private GameObject gameObjectWithVariable;

 void Start() 
 {
     gameObjectWithVariable = GameObject.Find("TheNameOfTheGameObjectThatContainsTheScriptWithTheVariableYouWant");
     myOtherVariable = GetComponent<TheNameOfTheScriptThatContainsThePublicVariable>().myVariable;
 }
 void Update() {
     myOtherVariable = GetComponent<TheNameOfTheScriptThatContainsThePublicVariable>().myVariable;
     Debug.Log(myOtherVariable);
 }

The update block is only necessary if you need to detect changes in the variable. If you just need to access it once, only having it in the Start() block will work.

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Adamcbrz · Mar 28, 2020 at 02:37 AM 2

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I don't want to be rude but please don't ever use GameObject.Find in an Update Loop. That implies your are going to search your entire Scene gameobject by gameobject until you find that element. To do that on Update would kill your frame rate. Do as you suggested and store a class reference in Start() then in update just reference that class.variable.

 private MyCustomClass myCustomClass;
 
 void Start()
 {
     myCustomClass = GameObject.Find("MyCustomClassObject").GetComponent<MyCustomClass>();
 }
 
 void Update()
 {
      var myOtherVar = myCustomClass.awesomeVariable;
 }

ahsen35813 Adamcbrz · Apr 01, 2020 at 04:10 PM 0

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Good point, thank you very much for telling me about that. I've revised the code so I hope that's better.

Answer 3

Answer by sacredgeometry · Mar 29, 2020 at 01:33 PM

Depending on what objects you are talking about you can get the references to significant game objects on startup or instantiation and keep those references in memory.

Then you can call methods on those objects or set properties/ fields on those objects to pass data between them.

Static members and singletons should be used sparingly (i.e. when appropriate) as they can cause all sorts of issues with threading and breaking the testability of your codebase.

If you really want to use them then at least consider using an IoC container and injecting them into your components as needed.

https://github.com/unitycontainer/unity

Let me know if any of that is unclear and I can provide examples.

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What is your own method to share data between script ?

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