基于Unity3D的异步加载场景的实现

在游戏中，异步加载场景是个特别有用的切换场景方式，尤其是对于资源比较大得场景。今天，我们就来实现一个异步加载场景功能。

1.打开Unity，创建俩个新场景，并添加到Build Setting中，如图：


2.打开StartScene场景，创建一个Slider控件，创建一个新的C#脚本：AsyncLoadScene.cs,并挂在Slider游戏对象上，并将SceneName赋值为AsyncScene，如图：


AsyncLoadScene脚本如下：

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

public class AsyncLoadScene : MonoBehaviour {
//异步加载的场景名字
public string sceneName;

//进度条
private Slider slider;
//异步操作
private AsyncOperation async;
//加载的进度
private int currentProcess;
private int totalProcess=0;

void Start(){
slider = GetComponent ();
StartCoroutine(Loading());
}
void Update()
{
if (async != null)
{
//注意async.progress最大返回值为0.9
if (async.progress < 0.85f) {
totalProcess = (int)(async.progress * 100);
} else {
totalProcess = 100;
}
if (currentProcess < totalProcess) {
currentProcess++;
}
slider.value = currentProcess/100f;
if (currentProcess == 100)
{
async.allowSceneActivation = true;
}
}
}
//进度加载
IEnumerator Loading()
{
async = SceneManager.LoadSceneAsync(sceneName);
async.allowSceneActivation = false;
yield return async;
}
}

3.点击运行，即可看到当Slider加载满时，切换到AsyncScene场景了。