Several Issues with IPointerClickHandler Unity

Question

I am trying to create a very simple button in Unity, using the information provided in this question but after a multitude of attempts it won't seem to work.

I have a "button" object, with a SpriteRenderer and BoxCollider2D component, a Physics2DRaycaster attached to my main camera, and the following code attached to the object:

using UnityEngine;
using UnityEngine.EventSystems;
using System.Collections;

public class ButtonController : MonoBehaviour, IPointerClickHandler
{

    // Use this for initialization
    void Start () {

    }

    // Update is called once per frame
    void Update () {

    }  

    public void OnPointerClick(PointerEventData eventData)
    {
        Debug.Log("Clicked" + eventData.pointerCurrentRaycast.gameObject.name);
    }
}

This is the scene, there is clearly nothing obstructing the button:

There is only the button and the camera in the scene:

And these are the components attached to both the camera and the button:

I'm aware this isn't strictly the kind of question to ask on here but it's been several days now and this should have been something very simple but can not for the life of me see what's gone wrong.

Read the troubleshooting part. If this is a sprite renderer then the object is 2D which means after attaching `Physics2DRaycaster` to the camera, you must attach any 2D collider to it. `CircleCollider2D` or `BoxCollider2D` should be fine. Also, you don't need to put that Sprite under the canvas. If you have to then consider using the `Image` or `RawImage` component which doesn't require collider at-all. — Programmer, Jun 04 '18 at 15:52
@Programmer I've done all those things, I've updated the question to make it more clear — Tom Ryan, Jun 05 '18 at 12:14
I see it now. That means you only have two objects in the scene? Camera and the object you want to detect clicks on? — Programmer, Jun 05 '18 at 18:12
Read the duplicate again. Scroll down to the "Troubleshooting" section. Read part A. It says something about EventSystem and shows how to create that. You must do that — Programmer, Jun 05 '18 at 18:15

zambari · Answer 1 · 2018-06-04T14:43:31.423

0

Do you have an Image component added to your object? For the event to trigger you need to have a component that can be a RaycastTarget, ie, it won't trigger from an empty gameObject, it also needs to be child of Canvas.

If you start from fresh scene and create any UI element from the GameObject menu, Unity will create an Event System, Canvas and InputModule components, which is a great start - if you can click the button, you should get your debug if you click on an image with your script - your code is correct.

For a sprite working with the event system, you'll need a physics raycaster and collider. A 3D Box collider works with Physics Raycaster, and 2D Box Collider works with Physics2D Raycaster, but if no collider is present your sprite won't intercept raycasts, they need colliders to work

edited Jun 04 '18 at 14:43

answered Jun 04 '18 at 14:33

zambari

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There is a sprite renderer attached and the object is a child of the canvas – Tom Ryan Jun 04 '18 at 14:35
sprite renderer is not meant for use with the UI system, use an Image or RawImage instead – zambari Jun 04 '18 at 14:37
for raycasts to work with sprites, use Physics Raycaster instead of Graphics Raycaster – zambari Jun 04 '18 at 14:38
1

It isn’t a UI object its just a gameObject that I want to be able to click – Tom Ryan Jun 04 '18 at 14:39
1

Dont make it a child of canvas then, and the camera needs to have a PhysicsRaycaster, not the graphics one, also, make sure the object has a collider (box collider is a good starting point) – zambari Jun 04 '18 at 14:40
The camera does have a PhysicsRaycaster – Tom Ryan Jun 04 '18 at 14:41
Add a Box Collider to your sprite then (Or box2D if you want to use physics2D raycaster) – zambari Jun 04 '18 at 14:46
I updated my answer to reflect that, almost forgot that sprites don't have colliders by default – zambari Jun 04 '18 at 14:46
Okay so with the object, a boxcollider and a physics2draycaster I should be able to just use the code I’ve got in my question? – Tom Ryan Jun 04 '18 at 14:48

Several Issues with IPointerClickHandler Unity

1 Answers1