call a method for every game object with the script attached

Questions & Answers
1

well… what i’m trying to do is, an way to call a method in every gameObject with the script attached

what i want to do is something like the void Update/Start/Awake:

//First Script
public class Caller
{
    int newValue = 3;
    
    public void ChangeValue()
    {
        //Call this method for every GameObject with the Receiver script
        Receiver.ChangeValue(newValue);
    }
}

//Second Script
public class Receiver
{
    public int value = 1;
    void ChangeValue(int value)
    {
        this.value = value;
    }
}
2

One way would be to use a delegate/event;

// Create a delegate type that matches your ChangeValue function
public delegate void MyDelegate (int a_Value);

public class Receiver : MonoBehaviour
{
    public int value = 1;

    // Create a static event out of the delegate
    public static event MyDelegate ChangeValueEvent;

    private void Awake ()
    {
        // Subscribe our ChangeValue function to the event when this object is created
        ChangeValueEvent += ChangeValue;
    }

    private void OnDestroy ()
    {
        // Also unsubscribe from the event when this object is destroyed
        ChangeValueEvent -= ChangeValue;
    }

    public void ChangeValue (int a_Value)
    {
        value = a_Value;
    }
}

From there, you can just call the event instead of the function;

public class Caller
{
    private int m_NewValue = 3;

    public void ChangeValue ()
    {
        // You can call ChangeValueEvent like a normal function, but using the syntax below also handles cases where no Receiver objects exist (and would therefore throw a NullReferenceException)
        Receiver.ChangeValueEvent?.Invoke (m_NewValue);
    }
}