init

Assets/Scripts/SceneLoader.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+public class SceneLoader : MonoBehaviour{
+
+    [System.Serializable] public enum DifficultySelected {Easy, Hard}
+    public DifficultySelected difficultySelected;
+
+    Animator anim;
+
+    public static SceneLoader instance;
+
+    void Awake(){
+        if(instance == null){
+            instance = this;
+        }else{
+            Destroy(gameObject);
+            return;
+        }
+
+        DontDestroyOnLoad(gameObject);
+
+        anim = GetComponent<Animator>();
+    }
+
+    public void LoadScene(int scene, DifficultySelected difficulty){
+        anim.SetTrigger("FadeOut");
+        StartCoroutine(SceneChange(scene, difficulty));
+    }
+
+    IEnumerator SceneChange(int scene, DifficultySelected difficulty){
+        yield return new WaitForSeconds(1);
+        difficultySelected = difficulty;
+        AsyncOperation operation = SceneManager.LoadSceneAsync(scene);
+
+        while (!operation.isDone)
+            yield return null;
+        
+        if (operation.isDone){
+            anim.SetTrigger("FadeIn");
+        }
+    }
+}