Scampz/Assets/Scripts/GameManager.cs

using System.Collections;
using UnityEngine;
using UnityEngine.SceneManagement;

namespace Scampz.GameJam
{
  public class GameManager : MonoBehaviour
  {
    public static GameManager Instance;

    void Awake()
    {
      if (Instance == null)
      {
        Instance = this;
      }
    }

    public void LoadScene(int levelIndex, LoadSceneMode loadSceneMode)
    {
      StartCoroutine(LoadSceneAsync(levelIndex, loadSceneMode));
    }

    public void UnloadScene(int levelIndex)
    {
      StartCoroutine(UnloadSceneAsync(levelIndex));
    }

    public void LoadScene(string sceneName, LoadSceneMode loadSceneMode)
    {
      StartCoroutine(LoadSceneAsync(sceneName, loadSceneMode));
    }

    public void UnloadScene(string sceneName)
    {
      StartCoroutine(UnloadSceneAsync(sceneName));
    }

    IEnumerator LoadSceneAsync(int levelIndex, LoadSceneMode loadSceneMode)
    {
      yield return null;

      var loadSceneOperation = SceneManager.LoadSceneAsync(levelIndex, loadSceneMode);
      loadSceneOperation.allowSceneActivation = false;
      while (!loadSceneOperation.isDone)
      {
        if (loadSceneOperation.progress >= 0.9f)
          break;
      }

      loadSceneOperation.allowSceneActivation = true;
      yield return loadSceneOperation;
    }

    private IEnumerator UnloadSceneAsync(int levelIndex)
    {
      yield return null;

      SceneManager.UnloadSceneAsync(levelIndex);
    }

    private IEnumerator LoadSceneAsync(string sceneName, LoadSceneMode loadSceneMode)
    {
      yield return null;
      var loadSceneOperation = SceneManager.LoadSceneAsync(sceneName, loadSceneMode);
      loadSceneOperation.allowSceneActivation = false;
      while (!loadSceneOperation.isDone)
      {
        if (loadSceneOperation.progress >= 0.9f)
          break;
      }

      loadSceneOperation.allowSceneActivation = true;
      yield return loadSceneOperation;
    }

    private IEnumerator UnloadSceneAsync(string sceneName)
    {
      yield return null;

      SceneManager.UnloadSceneAsync(sceneName);
    }

  }
}