According to Unity's Manual if you want to make your own UnityEvent utilizing a custom signature you need to declare a new class like so:
[Serializable]
public class StringEvent : UnityEvent <string> {}
It supports up to 4 arguments of any combination of String, Float, Int, Bool, and Object. With that in mind, not wanting to declare a new class each time I needed a custom event, I made this class that has every combination of those 5 types, from 1 to 4 arguments.
Not a complicated script at all, but it's convenient to have and easy to use:
using UnityEngine;
using System.Collections;
public class CustomEventExample : MonoBehaviour
{
public UnityEvents.F myFloatEvent;
public UnityEvents.BI myBoolIntEvent;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
}
}
