Finding UI Button from Canvas Gameobject in Unity 5.6

So in this scene, I have canvas with two buttons as shown in the picture below

This restart button has a tag 'restart_tag' and exit with 'exit_tag' button...

And in this scene, I want to reference to my buttons using variabel in my script and this variabel is a private var not a public, so I can't drag and drop button because it's a private. So what we can do for achieving this ?
We have several ways... :)
First... We can use a public function from canvas class namely GetComponentsInChildren<Button>(), this function will gonna return all of the button within this canvas as an array. Here is the example code :

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using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; public class canvas_sc1 : MonoBehaviour { private Button[] buttons; private Canvas cvs; // Use this for initialization void Start () { cvs = GetComponent<Canvas>(); buttons = cvs.GetComponentsInChildren<Button> (); Debug.Log (buttons[0].tag); Debug.Log (buttons[1].tag); } // Update is called once per frame void Update () { } }

When we run the game, we'll see that button[0] contains button for restart and another for exit

Another function that we can use is GetComponents. Here is the example :

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using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; public class canvas_sc1 : MonoBehaviour { private Button[] buttons; private Button button; private Canvas cvs; // Use this for initialization void Start () { cvs = GetComponent<Canvas>(); buttons = cvs.GetComponents<Button>(); Debug.Log (buttons); } // Update is called once per frame void Update () { } }

but unfortunately, for unity 5.6, GetComponents doesn't work... :v
So we can just use GetComponentsInChildrend ... :)

Video :