unity根据滑动条的进度完成场景加载_unity sllider

提醒：c#脚本知识中含有进阶知识呕

说明：开始菜单界面和加载界面是在同一个场景里，但加载界面刚开始不显示，当点击开始游戏后，激活加载界面，并同时更新滑动条进度，滑动条加载完成后，出现游戏场景

物体挂载情况：
1.playgame按钮挂载SceneChange脚本，并同时在按钮点击事件上绑定Scenechanges方法
2.CanvasLoading画布挂载Loading脚本
3.sllider在按钮点击事件上绑定CanvasLoadin物体的OnSliderProgressValueChange方法

loading.cs（更新进度条）

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

public class loading : MonoBehaviour
{
    public Slider slider;
    public Text text_Progress;

    public void UpdateProgress(float progress)
    {
        slider.value = progress;
    }
    public void OnSliderProgressValueChange(float v)
    {
        text_Progress.text = string.Format("{0}%", Mathf.Round(v * 100));
    }
    
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

SceneController.cs(加载场景脚本)

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

public class SceneController : MonoBehaviour
{
    private int currentIndex;
    private Action<float> onProgressChange;
    private Action onFinsh;

    private static SceneController instance;
    //调用该属性，即实例化对象
    public static SceneController Instance
    {
        get
        {
            if(instance==null)
            {
                GameObject obj = new GameObject("SceneController");
                obj.AddComponent<SceneController>();
            }
            return instance;
        }
    }

    private void Awake()
    {
        //不销毁物体，上面刚创建呢
        DontDestroyOnLoad(gameObject);
        if (instance != null)
        {
            throw new Exception("场景里多个SceneController");
        }
        instance = this;
    }
    public void LoadScene(int index,Action<float> onProgressChange,Action onFinsh)
    {
        this.currentIndex = index;
        this.onProgressChange = onProgressChange;
        this.onFinsh = onFinsh;
        StartCoroutine(LoadScene());
    }

    private IEnumerator LoadScene()
    {
        //yield return null;
        //采用LoadSceneAsync异步加载，可设置进度条来更新，当场景比较大时
        AsyncOperation asyncOperation = SceneManager.LoadSceneAsync(this.currentIndex);
        //属性在isDone为false时，最大加载到0.9就会暂停，
        //直到isDone为true时才会继续加载0.9-1.0的这10%
        while (!asyncOperation.isDone)
        {
            //让程序等待一帧
            yield return null;
            onProgressChange?.Invoke(asyncOperation.progress);
        }
        yield return new WaitForSeconds(1.0f);
        onFinsh?.Invoke();
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63

SceneChange.cs(加载界面（画布）的控制)

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SceneChange : MonoBehaviour
{
    //指定画布，要挂载loading脚本
    public loading load;
    //场景下标
    public int sceneIndex;
    //场景加载
    public void Scenechanges()
    {
        if (load != null)
        {
            // 显示当前画布
            load.gameObject.SetActive(true);
        }
        //实例化对象并通过lambad表达式传参
        SceneController.Instance.LoadScene(sceneIndex, (progress) =>
        {
            if (load)
            {
                //更新画布进度
                load.UpdateProgress(progress);
            }
        }, () =>
        {
            if (load)
            {
                //隐藏画布
                load.gameObject.SetActive(false);
            }
        });
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

效果：