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

public class LoadingScripts : MonoBehaviour
{
    private Slider slider;          //滑动条
    int currentProgress; //当前进度
    int targetProgress;  //目标进度
    // Start is called before the first frame update
    void Start()
    {
        currentProgress = 0;
        targetProgress = 0;
        slider = GameObject.Find("Slider").GetComponent<Slider>();
        StartCoroutine(LoadingScene()); //开启协成
    }


    private IEnumerator LoadingScene()
    {
        AsyncOperation asyncOperation = SceneManager.LoadSceneAsync(DataManager.Instance.NextScene); //异步加载1号场景
        asyncOperation.allowSceneActivation = false;                          //不允许场景立即激活//异步进度在 allowSceneActivation= false时，会卡在0.89999的一个值，这里乘以100转整形
        while (asyncOperation.progress < 0.9f)                                //当异步加载小于0.9f的时候
        {
            targetProgress = (int)(asyncOperation.progress * 100); //异步进度在 allowSceneActivation= false时，会卡在0.89999的一个值，这里乘以100转整形
            yield return LoadProgress();
        }
        targetProgress = 100; //循环后，当前进度已经为90了，所以需要设置目标进度到100；继续循环
        yield return LoadProgress();
        asyncOperation.allowSceneActivation = true; //加载完毕，这里激活场景 —— 跳转场景成功
    }
    private IEnumerator<WaitForEndOfFrame> LoadProgress()
    {
        while (currentProgress < targetProgress) //当前进度 < 目标进度时
        {
            ++currentProgress;                            //当前进度不断累加 （Chinar温馨提示，如果场景很小，可以调整这里的值 例如：+=10 +=20，来调节加载速度）
            slider.value = (float)currentProgress / 100; //给UI进度条赋值
            yield return new WaitForEndOfFrame();         //等一帧
        }
    }

    // Update is called once per frame
    void Update()
    {
        
    }
}