public UIProgressBar loadingAnimator;
  AsyncOperation async;
  float displayProgress = 0f;
  float toProgress = 0f;
  // Use this for initialization
  void Start () {
      // 执行协程方法
      StartCoroutine (loadScene());
  }
  IEnumerator loadScene ()
  {
      // 异步加载第三个场景
      async = Application.LoadLevelAsync (3);
      yield return new WaitForEndOfFrame();
      // 加载完成不自动进入
      async.allowSceneActivation = false;
      yield return async;
  }
  void FixedUpdate ()
  {
      if (async.progress <= 0.9f)
          toProgress = async.progress;
      if (displayProgress < toProgress + 0.1)
          displayProgress += 0.01f;
      loadingAnimator.value = (displayProgress);
      if (displayProgress >= 1)
          async.allowSceneActivation = true;

  }

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