Is there any way to fade in out any object on it's alpha color ?

This code is working for Image and if I will change the Image to Text and then it will fade in out an object with Text component.

Code (csharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5. using UnityEngine.SceneManagement;
6. using UnityEngine.UI;
7.  
8. public class Fader : MonoBehaviour
9. {
10.     #region FIELDS
11.     public GameObject[] fadeOutUIGameobjects;
12.     public float fadeSpeed = 0.8f;
13.     public bool fadeOnStart = false;
14.  
15.     private Image fadeOutUIImage;
16.  
17.     private void Start()
18.     {
19.         if (fadeOnStart == true)
20.         {
21.            StartCoroutine(Fade(FadeDirection.Out));
22.         }
23.     }
24.  
25.     public enum FadeDirection
26.     {
27.         In, //Alpha = 1
28.         Out // Alpha = 0
29.     }
30.     #endregion
31.  
32.     #region FADE
33.     public IEnumerator Fade(FadeDirection fadeDirection)
34.     {
35.         for (int i = 0; i < fadeOutUIGameobjects.Length; i++)
36.         {
37.             fadeOutUIGameobjects[i].SetActive(true);
38.  
39.             float alpha = (fadeDirection == FadeDirection.Out) ? 1 : 0;
40.             float fadeEndValue = (fadeDirection == FadeDirection.Out) ? 0 : 1;
41.             if (fadeDirection == FadeDirection.Out)
42.             {
43.                 while (alpha >= fadeEndValue)
44.                 {
45.                     SetColorImage(ref alpha, fadeDirection);
46.                     yield return null;
47.                 }
48.                 fadeOutUIGameobjects[i].SetActive(false);
49.             }
50.             else
51.             {
52.                 fadeOutUIGameobjects[i].SetActive(true);
53.                 while (alpha <= fadeEndValue)
54.                 {
55.                     SetColorImage(ref alpha, fadeDirection);
56.                     yield return null;
57.                 }
58.             }
59.         }
60.     }
61.     #endregion
62.  
63.     #region HELPERS
64.     public IEnumerator FadeAndLoadScene(FadeDirection fadeDirection, string sceneToLoad)
65.     {
66.         yield return Fade(fadeDirection);
67.         SceneManager.LoadScene(sceneToLoad);
68.     }
69.  
70.     private void SetColorImage(ref float alpha, FadeDirection fadeDirection)
71.     {
72.         for (int i = 0; i < fadeOutUIGameobjects.Length; i++)
73.         {
74.             if (fadeOutUIImage == null)
75.             {
76.                 fadeOutUIImage = fadeOutUIGameobjects[i].GetComponent<Image>();
77.             }
78.         }
79.  
80.         fadeOutUIImage.color = new Color(fadeOutUIImage.color.r, fadeOutUIImage.color.g, fadeOutUIImage.color.b, alpha);
81.         alpha += Time.deltaTime * (1.0f / fadeSpeed) * ((fadeDirection == FadeDirection.Out) ? -1 : 1);
82.     }
83.     #endregion
84. }
85.  

but if for example I have 5 Text's and 10 Image's and a Cube a Cylinder and a Canvas and I want to fade in out them all the same time ?

So I made the variable fadeOutUIGameobjects to be array but the problem is that the variable fadeOutUIImage is Image type only and if in the array there is also a Text or Canvas or a Cube it wil throw error exception since it's looking for Image.

 

If it's all UI stuff under a canvas, just use a canvas group. You can adjust the alpha on the canvas group and anything under it will fade...as a group.

https://docs.unity3d.com/ScriptReference/CanvasGroup.html

Otherwise, I would suggest a tweening engine where you can pass it something and tween over whatever value you need depending on what it is you pass in.

 

The most performant way to fade objects would be to use a shader (material), in other words access a unique materials shaders float values, at least I think.

You can more easily give UI game objects an animation.

Attach an animator component to the game objects inspector, and take a tutorial on YouTube.