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Question by DVecc · Jul 12, 2015 at 11:58 AM · alphaslider

Changing the alpha of a sliders fill?

I'm following the tutorial for the survival shooter and noticed that when the value of the health bar is 0 there is still some fill left in the slider. I want the sliders fill to not be visible when the sliders value is 0. Is there a way to change the alpha of the sliders fill color? Or is there another way to do this?

I thought that I could just create and if statement that changes the alpha of the fill when the value is 0 but I can't seem to figure out how to access the sliders fill color withing the script.

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Answer by wrok · Oct 31, 2015 at 12:43 PM

@DVecc

You need to go to your UI and there should be a game object that contains the Heart and Slider components.

Add a CanvasGroup to this game object.

Check the box that says ignore parent group.

And access it by using code similar to this.

 using UnityEngine;
 using UnityEngine.UI;                   // Add this first
 using System.Collections;
 
 public class Target : MonoBehaviour
 {
 
 
     public GameObject targetHealthUI;   // Reference to game object with canvasgroup
     CanvasGroup canvasTarget;           // Reference to the canvas group itself
 
     // You must drag the game object onto this script so targetHealthUI has a reference
 
     void Start()
     {
         // This is where you set the canvasgroup reference to the 
         // canvasgroup of the gameobject you dragged onto script
         canvasTarget = targetHealthUI.GetComponent<CanvasGroup>();
 
         // Then somewhere in your code just reference it
         canvasTarget.alpha = 0;
     }
 }
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avatar image mrCrush · Mar 24, 2018 at 02:44 PM 0
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Thank you. It works!

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Answer by Kada2001 · Apr 02, 2016 at 10:36 PM

What I do is have a variable that is a color with no alpha, and assign that color to be equal to the sliders. I had this same problem and had to get really creative on how to fix it. They should fix that in a unity update or explain how to fix it in a video. Example in C#; using UnityEngine.UI;

public Color ClearColor; public Color healthSliderColor; public int playerhealth; if(playerhealth <=0){ healthSliderColor = ClearColor; //player is dead }

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