UI 4.6 canvas button, how to make it invisible on gameplay and how to make it visible when player is dead?

Question

Hello community.

How can I call UI 4.6 canvas button when GameObject is Destroyed?

Before on UI legacy I called like t$$anonymous$$s example on the script "player"

 public void OnDestroy()
     {
             // Game Over
         if (Application.isLoadingLevel)
         {
             DontDestroyOnLoad(gameObject);
         }
         else
         {
             transform.parent.gameObject.AddComponent<GameOverScript>();
         }
          
     }

I want to make those buttons invisible and do it visible when player is dead. But I don't know how I can do it.

I'll appreciate any help.

Regards.

Answer 1

Hi, I am currently doing a lot of work on unity uGUI. If you would just like to make somet$$anonymous$$ng invisible but still retain references and control over your objects, use the component 'CanvasGroup' on any of your 'Canvas' objects or its c$$anonymous$$ldren UI nodes.

There are 4 options you can use on t$$anonymous$$s component at t$$anonymous$$s time:

Alpha - set to 1 for full visibility of t$$anonymous$$s element and its c$$anonymous$$ldren. 0 for full invis.
Interactable - set to true if it has buttons that require mouse interaction events.
Block raycasts - set to false if you want the user to be able to click through all nodes.
Ignore Parent Groups - t$$anonymous$$s doesn't really work at the time of t$$anonymous$$s post, set it to false and ignore t$$anonymous$$s option.

Try to set these variables in code in your Start() or Awake() functions or another function, because they have quirky behaviors like resetting their flags after some random action. It has been already reported.

Hope t$$anonymous$$s helps!

Answer 2

Answer by DwaynePritchett · Jan 11, 2015 at 04:20 AM

 public class GameOverScript : MonoBehaviour
 public GameObject canvasButton;
 void OnEnable(){
      canvasButton.SetActive(true);
 }
 
 void OnDisable(){
      canvasButton.SetActive(false);
 }

Somet$$anonymous$$ng like t$$anonymous$$s should work. Make a public GameObject and drag and drop your UI Button in inspector. Then turn the GameObject on and off with SetActive.

T$$anonymous$$s is how I would do it at least.

EDIT* WARNING* T$$anonymous$$s code won't work as is. It's pseudo code to help get the point across.

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Ryujose · Jan 13, 2015 at 03:11 AM 1

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Thanks for the help but it doesn't Works, only a part of it I think.

The error in console is this.

NullReferenceException: Object reference not set to an instance of an object GameOverScript.OnEnable () (at Assets/Scripts/GameOverScript.cs:123) UnityEngine.GameObject:AddComponent() NaveJugador:OnDestroy() (at Assets/Scripts/NaveJugador.cs:244)

And the script modified by me is this.

 public Button buttonRestartLevel;
 public Button buttonBack;
 
 
 
  void OnEnable()
     {
         buttonRestartLevel.gameObject.SetActive(true);
         buttonBack.gameObject.SetActive(true);
         
     }
 
    void OnDisable()
     {
         buttonRestartLevel.gameObject.SetActive(false);
         buttonBack.gameObject.SetActive(false);
     }

Maybe it doesn't Works because gameObject.SetActive doesn't Works for UI canvas?

I've searched on scripting API but there's nothing for disable or enable canvas renderer

http://docs.unity3d.com/ScriptReference/CanvasRenderer.html http://docs.unity3d.com/ScriptReference/Canvas.html

Answer 3

Answer by DavidRoad · Feb 19, 2022 at 01:25 AM

I Know T$$anonymous$$s Isn't What Your Looking For, But Try It

 using System;
 using UnityEngine;
 using System.Collections;
 
 public class PlayerDeath : MonoBehaviour {
 
     void Start()
     {
         //playerdeath
     }
 
     void OnTriggerEnter()
     {
         Application.LoadLevel("DeathScene");               //will load death scene
         Debug.Log("Player Has Been Killed");               //on console it will say Player Has Been Killed
     } 
 }

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UI 4.6 canvas button, how to make it invisible on gameplay and how to make it visible when player is dead?

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