init

Assets/Scripts/Level/LevelLoader.cs

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+using System.Collections;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+using UnityEngine.UI;
+
+public class LevelLoader : MonoBehaviour{
+
+    public GameObject loadingScreen;
+    public Slider slider;
+
+    public void LoadLevel(int sceneIndex){
+        StartCoroutine(LoadAsychronously(sceneIndex));
+    }
+
+    IEnumerator LoadAsychronously (int sceneIndex){
+        AsyncOperation operation = SceneManager.LoadSceneAsync(sceneIndex);
+
+        loadingScreen.SetActive(true);
+
+        while (!operation.isDone){
+            float progress = Mathf.Clamp01(operation.progress / .9f);
+            slider.value = progress;
+
+            yield return null;
+        }
+    }
+}