147 lines
4.6 KiB
C#
147 lines
4.6 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.SceneManagement;
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using UnityEngine.UI;
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namespace A2W
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{
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public class SceneLoader : Singleton<SceneLoader>
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{
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ITransition currentTransition; // 当前的过场实例
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Canvas canvas;
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public bool isPreLoading { get; set; } = false; // 预加载中
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public Action OnFinished; // 转场结束
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bool isLoading = false;// 现在是否可以转场
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WaitForSeconds leastTime;
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public void Init()
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{
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GameObject go = new GameObject();
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go.name = "LoadingCanvas";
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go.transform.SetParent(transform, false);
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canvas = go.AddComponent<Canvas>();
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canvas.renderMode = RenderMode.ScreenSpaceOverlay;
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canvas.sortingOrder = 1000;
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CanvasScaler canvasScaler = go.AddComponent<CanvasScaler>();
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canvasScaler.uiScaleMode = CanvasScaler.ScaleMode.ScaleWithScreenSize;
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canvasScaler.referenceResolution = new Vector2(Screen.width, Screen.height);
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}
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/// <summary>
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/// 使用转场加载场景
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/// </summary>
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/// <param name="SceneName">场景名称</param>
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/// <param name="transition">转场方式</param>
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/// <param name="hasPreload">是否有预加载</param>
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/// <param name="leastTime">至少等待一定时间</param>
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public void LoadScene(string SceneName, ITransition transition = null, bool hasPreload = false, float leastSecond = 0.2f)
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{
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// 如果现在不能转换场景直接返回
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if (isLoading) return;
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if (canvas is null)
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{
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Init();
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}
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isPreLoading = hasPreload;
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leastTime = new WaitForSeconds(leastSecond);
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currentTransition = transition;
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// 如果有设置过场就设置过场
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if (transition is not null)
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{
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currentTransition.Init(canvas.transform);
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}
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// 开始转换场景
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StartCoroutine(LoadLevel(SceneName));
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}
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/// <summary>
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/// 转换场景并且使用过场动画
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/// </summary>
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/// <param name="levelName">场景名称</param>
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/// <returns></returns>
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private IEnumerator LoadLevel(string levelName)
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{
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// 异步加载场景
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AsyncOperation loading = SceneManager.LoadSceneAsync(levelName);
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// 不允许场景加载完后直接转换
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loading.allowSceneActivation = false;
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// 现在不再能转换场景
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isLoading = true;
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if (currentTransition is not null)
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{
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// 开始过场
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currentTransition.Begin();
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// 等待一帧
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// 理由再下面有解释，但其实这里本来不需要，因为检查动画前还夹着一个检查加载的过程。基本不会在一帧内就加载完
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// 但是保险起见还是在播放动画后延迟一帧
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yield return null;
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// 至少等待一定时间
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yield return leastTime;
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// 等待动画播放完成
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while (!currentTransition.IsDone())
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yield return null;
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}
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// 等待场景加载几乎完成
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while (loading.progress < 0.899)
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yield return null;
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// 允许场景加载完成
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loading.allowSceneActivation = true;
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// 等待场景加载彻底完成
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while (loading.progress != 1)
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yield return null;
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//等待预加载完毕
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while (isPreLoading)
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yield return null;
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if (currentTransition is not null)
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{
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// 结束过场
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currentTransition.Finish();
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// 等待一帧
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// 因为我发现如果在开始动画后不等待一帧的话，第二个动画其实还没开始播放，
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// 后面检测动画完成检测的就是第一个动画，就起不到检测第二个动画的作用。
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yield return null;
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// 至少等待一定时间
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yield return leastTime;
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// 等待动画播放完成
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while (!currentTransition.IsDone())
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yield return null;
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}
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// 可以继续转换场景
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isLoading = false;
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OnFinished?.Invoke();
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}
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}
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}
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