using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;
/********************************************************************************
*Create By CG
*Function 异步场景加载控制(有界面显示)
*********************************************************************************/
namespace CG.UTility
{
    public class LoadScenesAsync : MonoBehaviour
    {
        private bool _isLoadScene;//是否加载场景
        private AsyncOperation _async;
        private int _toProgress = 0;//读取场景进度
        private int _nowProgress = 0;//当前场景返回进度
        [SerializeField]
        private Slider _slider=null;//进度条
        [SerializeField]
        private Text _sliderTxt=null;//显示百分比

        private System.Action _loadedCall = null;
        private void Update()
        {
            if (_isLoadScene)
            {
                if (_async == null) return;
                if (_async.progress < 0.9f)
                {
                    _toProgress = (int)_async.progress * 100;
                }
                else
                {
                    _toProgress = 100;
                }
                if (_nowProgress < _toProgress)
                {
                    _nowProgress++;
                }
                _slider.value = _nowProgress / 100.0f;
                _sliderTxt.text = _slider.value * 100 + "%";
                if (_nowProgress == 100)
                {
                    _isLoadScene = false;
                    _async.allowSceneActivation = true;
                    _loadedCall?.Invoke();
                }
            }
        }
        /// <summary>
        /// 加载场景主方法
        /// </summary>
        /// <param name="sceneName"></param>
        public void LoadSceneAsync(string sceneName, System.Action LoadedCall)
        {
            _loadedCall = LoadedCall;
            gameObject.SetActive(true);
            _toProgress = 0;
            _nowProgress = 0;
            _isLoadScene = true;
            StartCoroutine("LoadScene", sceneName);
        }

        private IEnumerator LoadScene(string sceneName)
        {
            yield return new WaitForEndOfFrame();//加上这句可以先让加载画面显示
            _async = SceneManager.LoadSceneAsync(sceneName);
            _async.allowSceneActivation = false;
            yield return _async;
            Destroy(gameObject);
        }
    }
}