GameObject.BroadcastMessage

Description

Calls the method named methodName on every MonoBehaviour in this GameObject or any of its children.

The receiving method can choose to ignore parameter by having zero parameters. If options is set to SendMessageOptions.RequireReceiver an error is printed when the message is not picked up by any component.

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        /// Calls the function ApplyDamage with a value of 5
        /// // Every script attached to the GameObject and all its children
        // that has a ApplyDamage function will be called.
        gameObject.BroadcastMessage("ApplyDamage", 5.0);
    }
}


public class Example2 : MonoBehaviour
{
    public void ApplyDamage(float damage)
    {
        print(damage);
    }
}