unity3d，异步加载场景

很简单，代码如下：

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class Loading : MonoBehaviour {

  public Slider loading_bar;
  private AsyncOperation async_operation;

  // Use this for initialization
  void Start () {
    StartCoroutine ("LoadScene");
  }
  
  // Update is called once per frame
  void Update () {
    loading_bar.value = async_operation.progress;
  }

  IEnumerator LoadScene(){
    async_operation = Application.LoadLevelAsync ("scene name");
    yield return async_operation;
  }
}

unity5.3以后，推荐用scene manage,

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

public class LoadSlider : MonoBehaviour
{

  public Slider slider;
  public GameObject panel;
  private AsyncOperation async_operation;
  private bool load_switch;


  // Use this for initialization
  void Start ()
  {
    panel.SetActive (false);
    load_switch = false;
  }
  
  //显示加载进度
  void Update ()
  {
    if (load_switch) {
      slider.value = async_operation.progress;
    }
  }

  //根据输入名加载场景
  public void StartScene (string scene_name)
  {
    panel.SetActive (true);
    load_switch = true;
    StartCoroutine ("LoadScene", scene_name);
  }

  //异步加载场景
  IEnumerator LoadScene (string scene_name)
  {
    async_operation = SceneManager.LoadSceneAsync (scene_name);
    yield return async_operation;
  }
}