Unity Canvas button not working

Question

I added a canvas component to one of my images to override default layer order sorting. Turns out the button controls on that panel have stopped working?

Has anyone any idea about this in Unity? I am using unity 5.5.2.

Adding a canvas to an object can mess up a lot of things. In this case, it's not so much that the button controls have stopped working, but that the mouse clicks are being captured by the top-most parent canvas and not falling through to child canvases. — Draco18s no longer trusts SE
– Draco18s no longer trusts SE, Commented Oct 20, 2017 at 15:10

Hellium · Accepted Answer · 2018-02-08 09:42:45Z

25

The easiest way to debug is to :

Run the game in the editor, not in full screen (uncheck Maximize On Play button)
Select the EventSystem GameObject of your scene
In the inspector, open the Preview Window and make it big enough
Move your mouse on your screen, and check if the name of your buttons appear next to the field pointerEnter

If you can't see it, here are possible solutions :

Make sure you don't have any UI elements above your button which could block the raycasts
Make sure you have enabled raycasting on the images used by your buttons (check RaycastTarget)

Make sure you have an EventSystem in your scene
Make sure you have a callback attached to your buttons so as to trigger your functions
Make sure you don't have any CanvasGroup with BlocksRaycast or Interactable set to false
Make sure you have a GraphicRaycaster attached on a gameobject (on the Canvas usually)

edited Feb 8, 2018 at 9:42

answered Oct 20, 2017 at 16:06

Hellium

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2 Comments

leelavinodh Over a year ago

Thank you. This helped me to fix my issue. Also learned how to debug with event system preview window.

Kaito Over a year ago

thanks I couldn't understand why this was happening but the first thing you said helped me there was an text above my button preventing from interacting thank you again

Jajan · Accepted Answer · 2017-10-23 19:51:11Z

6

Turns out I did not know that you have add a Graphic Raycaster component as well. Started taking input after that.

Thanks everyone.

answered Oct 23, 2017 at 19:51

Jajan

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