unity教程:加载场景时过场界面实现
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
public class UIManager : MonoBehaviour
{
public CanvasGroup UI;
private void Awake()
{
UI = FindObjectOfType<CanvasGroup>();
}
private void OnEnable()
{
SceneSwitchEventHandler.SwitchScenes += OnSwitchScenes;
}
private void OnDisable()
{
SceneSwitchEventHandler.SwitchScenes += OnSwitchScenes;
}
/// <summary>
/// 订阅(场景切换)
/// </summary>
/// <param name="targetScene">目标场景</param>
private void OnSwitchScenes(string targetScene)
{
StartCoroutine(SwitchScenes(targetScene));
}
/// <summary>
/// 切换场景方法
/// </summary>
/// <param name="targetScene">目标场景</param>
private IEnumerator SwitchScenes(string targetScene)
{
//将加载显示UI界面优先级调高于其他场景的UI界面
UI.GetComponentInParent<Canvas>().sortingOrder = 1;
//调用方法 将加载显示UI界面的透明度逐渐调高至完全不透明
yield return Fade(1);
//关闭当前激活的场景 (异步)
yield return SceneManager.UnloadSceneAsync(SceneManager.GetActiveScene());
//加载需要的场景并设置为激活
yield return LoadSceneSetActive(targetScene);
//调用方法 将加载显示UI界面的透明度逐渐调低至完全透明
yield return Fade(0);
//恢复加载显示UI界面的优先级
UI.GetComponentInParent<Canvas>().sortingOrder = -1;
}
/// <summary>
/// 加载场景并设置为激活
/// </summary>
/// <param name="sceneName">场景名</param>
/// <returns></returns>
private IEnumerator LoadSceneSetActive(string sceneName)
{
yield return SceneManager.LoadSceneAsync(sceneName, LoadSceneMode.Additive);
Scene newScene = SceneManager.GetSceneAt(SceneManager.sceneCount - 1);
SceneManager.SetActiveScene(newScene);
}
/// <summary>
/// 逐渐修改UI界面的透明度
/// </summary>
/// <param name="targetAlpha">修改值</param>
/// <returns></returns>
private IEnumerator Fade(float targetAlpha)
{
UI.blocksRaycasts = true;
float speed = Mathf.Abs(UI.alpha - targetAlpha) / 1.5f;
while (!Mathf.Approximately(UI.alpha, targetAlpha))
{
UI.alpha = Mathf.MoveTowards(UI.alpha, targetAlpha, speed * Time.deltaTime);
yield return null;
}
UI.blocksRaycasts = false;
}
}
using UnityEngine;
public class LoadScene : MonoBehaviour
{
/// <summary>
/// 加载场景
/// </summary>
/// <param name="sceneName">加载场景名字</param>
public void SwitchScene(string sceneName)
{
SceneSwitchEventHandler.CallSwitchScenes(sceneName);
}
}
using System;
public static class SceneSwitchEventHandler
{
/// <summary>
/// 事件(切换场景时调用)
/// </summary>
public static Action<string> SwitchScenes;
/// <summary>
/// 调用事件
/// </summary>
/// <param name="targetScene">目标场景</param>
public static void CallSwitchScenes(string targetScene)
{
SwitchScenes?.Invoke(targetScene);
}
}
