Unable to trigger the onClick event of a game object with a run-time listener.

Questions & Answers
1

I’m trying to add an onClick listener to a game object’s button component. It gets added successfully, but when I click the game object, nothing happens.

Here is a picture of my inspector (was not able to attach an image):

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I instantiate all of the game objects at the beginning of the build then apply the listeners, but I think the issue has to do with the game object and registering the click.

	UnityEngine.Events.UnityAction bomb_holder_action;

	void Start()
    {
		bomb_holder_action = () => { AddBomb(); };

		bombs = 0;
		AddBomb();

		int i = 0;
		foreach (GameObject go in GameObject.FindGameObjectsWithTag("FlowObject_Bomb"))
		{
			go.GetComponent<Button>().onClick.AddListener(bomb_holder_action);
			Debug.Log("Listener added to bomb#" + i);
			i++;
		}
	}

Some of the possible issues I see might be that the button component doesn’t have a canvas and is missing a target graphic. I’m not sure how I would implement a canvas since the game objects move and get destroyed after some time. When I add a target graphic through an image game object, it doesn’t move with the parent object. If anyone can help, it would be appreciated. I’ve been messing around with this for a few hours to no avail.

2

Turns out the prefab needed to be instantiated in a canvas and an image object in the prefab was needed for the “target graphic” property of its button.