unity用 AsyncOperation 实现异步加载场景的slider进度条面板

public class AsyncLoadScene : BaseUIForm
{
private const string NAME = "AsyncLoadScene";

/// 通常的进度条
public Slider loadingSlider;
//public Text Tips;
public Text loadingText;

public Canvas canvas;

private int displayProgress;
private int toProgress;

AsyncOperation operation;

private void Start()
{
operation = null;
InitScene();

if (SceneManager.GetActiveScene().name == "LoadingScene")
{
//启动协程
StartCoroutine(AsyncLoading());
}

}
#region 额外的初始化
protected override void Initialization()
{
MsgTypeName = NAME;
CurrentUIType.UIForms_LucencyType = UIFormLucenyType.DnotMask;
}

// 背景图随机2选1
protected override void InitUIInfo()
{
int BgSignal=Random.Range(1,3);
this.SetSprite(Managers.AtlasType.GeneralUI, "LoadScene_bg" + BgSignal);
}

/// 初始化场景
void InitScene()
{
loadingSlider.value = 0;
loadingSlider.maxValue = 100;

loadingSlider.gameObject.SetActive(true);
GetComponent

().color = new Color(1, 1, 1, 1);
switch(Globe.LoadingSceneKind)
{
case LoadingKind.InitGame:
{
m_LaodGameMap.gameObject.SetActive(false);
}
break;
case LoadingKind.BattleScene:
{
m_LaodGameMap.gameObject.SetActive(false);
}
break;

}
}

/// 异步加载
private IEnumerator AsyncLoading()
{
TipsInfo.text = Globe.nextSceneName;
operation= SceneManager.LoadSceneAsync(Globe.nextSceneName);
operation.allowSceneActivation = false;

while (operation.progress < 0.9f)
{
// 获取真实的加载进度
toProgress = (int)(operation.progress * 100);
// 让进度条滑动更平滑
while (displayProgress < toProgress)
{
++displayProgress;
SetLoadingPercentage(displayProgress);
yield return new WaitForEndOfFrame();
}

}

toProgress = 100;
StartCoroutine(LoadScene(operation));

}

IEnumerator LoadScene(AsyncOperation operation)
{
switch (Globe.LoadingSceneKind)
{
case LoadingKind.InitGame:
{
while (displayProgress < toProgress)
{
++displayProgress;
SetLoadingPercentage(displayProgress);
yield return new WaitForEndOfFrame();
}
//operation.allowSceneActivation = true;

// 后台异步加载完成后暂停切换场景，按任何键继续切换
StartCoroutine(PauseSwitchScene());
}
break;
case LoadingKind.BattleScene:
{

// 继续加载剩余部分
while (displayProgress < toProgress)
{
++displayProgress;
SetLoadingPercentage(displayProgress);
//yield return new WaitForEndOfFrame();
yield return null;
}

// 后台异步加载完成后暂停切换场景，按任何键继续切换
StartCoroutine(PauseSwitchScene());

}
break;

}

}

public void ShowScene()
{
UIFORM.Globe.ShowAllUI();
}

/// 设置通常的加载信息

private void SetLoadingPercentage(int Percentage)
{
loadingSlider.value = Percentage;
loadingText.text = Percentage + "%";
}

/// 设置游戏地图的加载信息
private void SetLoadingGameMapPercentage(int Percentage)
{
LoadingGameMapSlider.value = Percentage;
LoadingTextGameMap.text = "生成地图中..."+Percentage + "%";
}

/// 后台异步加载完成后暂停切换场景，按任何键继续切换
private IEnumerator PauseSwitchScene()
{
bool IsGoOn = false;
while (!IsGoOn)
{
if (displayProgress >= 90)
{
loadingText.text = "按任意键继续";
if (Input.anyKeyDown)
{
IsGoOn = true;
operation.allowSceneActivation = true;
}
}
yield return null;
}

}
}