Heads up Display

Is there a way to detect a click on a UI Image?

I want to make a button on my maze game (http://coolfone.mobi/fpmaze9/) so that when the user is holding down the button, the character moves forward.

Thanks.

 

How is your UI implemented? I mean, the answer is "yes", but the specifics of how depend on your UI system.

 

Yes. Just add an EventTrigger component.

Or implement the EventSystem interfaces.

This video is not explicitly about detecting clicks, but it does go through the process.

 

Indeed, I've found the best way to detect clicks anywhere on the screen is to put a full-screen Image (with no texture and color alpha set to zero, so it's invisible) in the UI behind everything else, and then attach an EventTrigger. Then you hook that up to whatever game object should handle clicks in the world.

The reason I find this the best is that you can then properly handle clicks on other UI elements (e.g. buttons) without those falling through to the world. That can be a real thorny problem otherwise.

 

You implement interface and you need:

Code (CSharp):

1. using UnityEngine.UI;
2. using UnityEngine.EventSystems;

Code (CSharp):

1. IPointerDownHandler // In your class
2.  
3. // then
4.  
5. public virtual void OnPointerDown(PointerEventData data)
6. {
7.     // Your click action here
8. }

 

Okay. Event trigger appears to work.



I posted a new version of the maze with event triggers at http://coolfone.mobi/fpmaze11/.

Thanks.