How to create a script that change value of a public int of another script.

Unity Engine
1

How could I create a code that when pressing a button changes the value of a public int of another script that is used in another scene and make the public int run at the start of that script with the new value assigned? I tried a thousand ways and it doesn’t work out, I don’t know what else to try, on top of that I have little knowledge since I just started programming 2 months ago.

2

It is the same as changing an int in the same script, except you change the int on a reference to the other script

public OtherScript OtherScriptReference;  //Set in inspector

void ButtonPressed()
{
    OtherScriptReference.SomePublicVariable++;
}
3 
public SceneLogic sceneLogic;

public void ButtonPressed1()
    {
        sceneLogic.LevelIndex= 0;
    }

    public void ButtonPressed2()
    {
        sceneLogic.LevelIndex = 1;
    }

    public void ButtonPressed3()
    {
        sceneLogic.LevelIndex = 2;
    }

    public void ButtonPressed4()
    {
        sceneLogic.LevelIndex = 3;
    }

I try with that but always excute the first level that is “LevelIndex= 0”. I don’t know why. Maybe if i could put the levelindex at start of the other script should work but i don’t know how, because i can’t put without a number.
The weird thing is that if i put a debug log in ButtonPressed2() and make click in that button it runs the debug log but not change the level index.

4

Are you sure you’re either not changing LevelIndex somewhere else, or even using the variable at all?

5

Is the instance of SceneLogic properly marked as a singleton so that you don’t get a brand-new one each time you switch levels?

Some super-simple Singleton examples to take and modify:

Simple Unity3D Singleton (no predefined data):

Unity3D Singleton with Prefab used for predefined data:

These are pure-code solutions, do not put anything into any scene, just access it via .Instance!

If it is a GameManager, when the game is over, make a function in that singleton that Destroys itself so the next time you access it you get a fresh one, something like:

public void DestroyThyself()
{
   Destroy(gameObject);
   Instance = null;    // because destroy doesn't happen until end of frame
}
6

I was able to solve it using playerprefs. Thanks for the help anyway!