How to Enable Slide bar for Loading Scene

 

Step 1:

Make Canvas within LoadingImage and in it Make a slider from UI menu.

And Create a Button to Load your desired level

Then Create a script LoadLevelAsync

Write the following code

   1: public GameObject loadingImage;

   2:  public Slider slider;

   3:  private AsyncOperation async;

   4:  public void ClickAsync(int level)

   5:  {

   6:      loadingImage.SetActive(true);

   7:      StartCoroutine(LoadLevelWithBar(level));

   8:  }

   9:  

  10:  IEnumerator LoadLevelWithBar(int level)

  11:  {

  12:    async  = Application.LoadLevelAsync(level);

  13:      while (!async.isDone)

  14:      {

  15:        slider.value =  async.progress;

  16:          yield return null;

  17:      }

  18:  }