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前言：
玩游戏最讨厌的是什么呢？当然是游戏加载界面啦
* 但是你知道吗，加载界面在游戏制作中是不可或缺的，它可以使我们的场景完全加载完毕后再进入游戏，确保用户不会出现加载卡顿的情况。
如何实现一个简易的加载界面呢？来跟我学习一下吧
效果图
UI创建：
首先创建一个开始界面，为Button按钮添加事件来完成场景的转换：
然后创建一个加载界面的UI，首先需要的呢就是一个游戏进度条，可以直接使用Slider来完成创建，其UI层级关系为：
其元素作用为：
* Background:即整个进度条的背景为棕色
* Fill:是加载过的进度条的填充，为蓝色区域
* Hander:是中间的白色方块，为加载临界点
上面三个元素都可以通过修改其上面的Image组件完成对形状的修改，而Hander的位置则是通过Slider
上的接口Value来完成的,同样我们在脚本中可以调用其API:
其次呢，需要为加载界面添加一个Text 文本框，来输出加载百分比
异步加载脚本编写：
实现异步场景加载需要通过AsyncOperation来完成，查阅官方文档，可以发现AsyncOperation
是一个类，其基本属性有如下几种（加黑为本次使用）：
* allowSceneActivation:加载完成后，是否允许场景跳转
* isDone:场景是否加载完成
* priority:可以调整异步加载的优先级
* progress:场景加载进度，数值为从0到1
我们知道场景的直接转换是通过SceneManager.LoadScene()来直接跳转完成的，而对于异步加载而言场景的跳转是通过
SceneManager.LoadSceneAsync()来完成的。
两者区别：
查看Unity官方手册
而为了在场景没有加载完之前，就不进行场景跳转，需要使用协程来控制其转换：
public GameObject image; //加载界面 public Slider slider; //进度条 public Text text;
//加载进度文本 public void LoadNextLeaver() { image.SetActive(true); StartCoroutine(
LoadLeaver()); } IEnumerator LoadLeaver() { AsyncOperation operation =
SceneManager.LoadSceneAsync(SceneManager.GetActiveScene().buildIndex + 1);
//获取当前场景并加一 //operation.allowSceneActivation = false; while(!operation.isDone)
//当场景没有加载完毕 { slider.value = operation.progress; //进度条与场景加载进度对应 text.text = (
operation.progress * 100).ToString()+"%"; yield return null; } }
完成，求三连！
