Button.onClick

Description

UnityEvent that is triggered when the button is pressed.

Note: Triggered on MouseUp after MouseDown on the same object.

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class ClickExample : MonoBehaviour
{
    public Button yourButton;

    void Start()
    {
        Button btn = yourButton.GetComponent<Button>();
        btn.onClick.AddListener(TaskOnClick);
    }

    void TaskOnClick()
    {
        Debug.Log("You have clicked the button!");
    }
}