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

public class SceneLoader : MonoBehaviour
{
    public string SceneName ="MainScene";
    public Text ProgressText;
    public Slider ProgressSlider;

    private bool isloading;
    private AsyncOperation async;
    private int curProgressVaule = 0;

    // Start is called before the first frame update
    void Start()
    {
        StartCoroutine(AsyncLoading());

        Observable.EveryUpdate()
            .Where(_ => isloading)
            .Subscribe(_ => 
            {
                int progressVaule = 0;
                if (async.progress < 0.9f)
                    progressVaule = (int)async.progress * 100;
                else
                    progressVaule = 100;
                if (curProgressVaule < progressVaule)
                    curProgressVaule++;
            }).AddTo(gameObject);

        Observable.EveryLateUpdate()
            .Subscribe(_ => 
            {
                ProgressText.text = curProgressVaule + "%";//实时更新进度百分比的文本显示  
                ProgressSlider.value = curProgressVaule;
                if (curProgressVaule == 100)
                    async.allowSceneActivation = true;

            }).AddTo(gameObject);
    }

    IEnumerator AsyncLoading()
    {
        isloading = true;
        async = SceneManager.LoadSceneAsync(SceneName);
        async.allowSceneActivation = false;
        yield return async;
    }
}