Unity UI实现循环播放序列图代码

一、思路

1.获取播放组件

一般我们使用UI的Raw Image或者Image来显示图片

Image：仅支持Sprite类型图片，需要更改图片的格式（注意：在StreamingAssets文件夹里的图片是更改不了类型的，在这里必须放在Assets/Resources路径下）

Raw Image：支持图片的原格式，一般我们将其转换成 Texture2D使用

2.加载图片

Resources提供了一个Load方法，可以从Resources文件夹里加载图片。

！！！！！注意一定要在Resources路径下，否则找不到

Resources.Load(path, typeof(Texture2D)) as Texture2D;
Resources.Load(path, typeof(Sprite)) as Sprite;

3.循环加载

记录当前到哪一张，判断是不是到了最后一张，是，加载第一张

二、示例代码

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

public class FramesController : MonoBehaviour
{
  [System.Serializable]
  public struct NameRules
  {
      [Header("基础名称(基础名字就是序列图名称中绝对相同的)")]
      public string BaseName;

      [Header("有效数字的位数(代表排序的有效数字位数)")]
      public int SignificantDigits;

      [Header("开始数(开始的数)")]
      public int Start;

      [Header("总数(一共多少张图片)")]
      public int Count;

      public NameRules(string _name,int _digits,int _start,int _count)
      {
          BaseName = _name;
          SignificantDigits = _digits;
          Start = _start;
          Count = _count;
      }
  }
  //图片类型
  public enum WidgetType
  {
      Image,
      RawImage
  }
  /// 
  [Header("图片显示控件(RawImage[支持原始图片类型] OR Image[仅支持Sprite图片])")]
  public WidgetType ImgWidget = WidgetType.RawImage;

  //要求文件夹必须在Assets/Resources文件夹里面，ModeName填写后面到文件夹的路径
  [Header("模式名称(和文件夹名称相同,路径必须在Resources里面)")]
  public string ModeName = "请填写文件夹路径";

  [Header("命名规则(序列图的命名规则)")]
  public NameRules Rules;

  [Header("FPS(一秒内显示多少张图片)")]
  public int FramesPerSecond = 24;

  [Header("循环播放(默认开启)")]
  public bool Loop=true;

  [Header("UI可用时自动播放(默认开启)")]
  public bool PlayOnWake=true;




  /// <summary>
  /// 私有变量
  /// </summary>
  /// /// 显示图片的UI控件
  private Image ImageComponent = null;
  private RawImage RawImgComponent = null;

  
  private int currentFrames;//当前播放的图片帧数
  private float showTime = 0.0f;
  private float rateTime = 0.0f;

  private bool Playing;

  // Start is called before the first frame update
  void Start()
  {
      InitWidget();
  }
  // Update is called once per frame
  void Update()
  {
      if (!Playing) return;
      showTime += Time.deltaTime;
      if (showTime >= rateTime)
      {
          showTime = 0;
          currentFrames++;
          if (currentFrames >= Rules.Count)
          {
              if(Loop)
              {
                  currentFrames = Rules.Start;
              }else
              {
                  Playing = false;
              }
          }
          if(ImgWidget == WidgetType.Image)
          {
              ImageComponent.sprite = GetCurrentSprite();
          }
          else
          {
              RawImgComponent.texture = GetCurrentTexture2D();
          }
      }
  }

  /// /更换播放的序列图
  public void ChangeMode(string _mode, NameRules _rules, int _fps=24)
  {
      ModeName = _mode;
      Rules=_rules;
      FramesPerSecond = _fps;

      currentFrames = Rules.Start;
      rateTime = 1.0f / FramesPerSecond;
      if (ImgWidget == WidgetType.Image)
      {
          ImageComponent.sprite = GetCurrentSprite();
      }
      else
      {
          RawImgComponent.texture = GetCurrentTexture2D();
      }
  }
  //开始播放
  public void Play(bool needLoop=true)
  {
      Playing = true;
      Loop = needLoop;
  }
  //停止播放
  public void Stop()
  {
      Playing = false;
  }

  private Sprite GetCurrentSprite()
  {
      /这个是重点，显示不出来图片的话，大概率问题在这个函数
      string formatStr = "{0:D" + Rules.SignificantDigits + "}";//保留有效数字，不够前面加0
      string imageName = ModeName + "/" + Rules.BaseName + string.Format(formatStr, currentFrames);
      return LoadSprite(imageName);
  }

  private Texture2D GetCurrentTexture2D()
  {
      /这个是重点，显示不出来图片的话，大概率问题在这个函数
      string formatStr = "{0:D"+ Rules .SignificantDigits+ "}";//保留有效数字，不够前面加0
      string imageName = ModeName+"/"+Rules.BaseName + string.Format(formatStr, currentFrames);
      return LoadTexture2D(imageName);
  }

  private Texture2D LoadTexture2D(string path)
  {
      return Resources.Load(path, typeof(Texture2D)) as Texture2D;
  }

  private Sprite LoadSprite(string path)
  {
      return Resources.Load(path, typeof(Sprite)) as Sprite;
  }
  /// <summary>
  /// 初始化图片显示组件
  /// </summary>
  private void InitWidget()
  {
      if(ImgWidget== WidgetType.Image)
      {
          ImageComponent = transform.gameObject.GetComponent<Image>();
          if(ImageComponent==null)
          {
              EditorBox("此组件上没有找到<Image>!请检查后重试!");
              EditorStop();
          }
      }
      else
      {
          RawImgComponent = transform.gameObject.GetComponent<RawImage>();
          if (RawImgComponent == null)
          {
              EditorBox("此组件上没有找到<RawImage>!请检查后重试!");
              EditorStop();
          }
      }
      Playing = PlayOnWake;
      currentFrames = Rules.Start;
      rateTime = 1.0f / FramesPerSecond;
      if (ImgWidget == WidgetType.Image)
      {
          ImageComponent.sprite = GetCurrentSprite();
      }
      else
      {
          RawImgComponent.texture = GetCurrentTexture2D();
      }
  }

  /// <summary>
  /// Unity编辑器的MessageBox
  /// </summary>
  private void EditorBox(string msg)
  {
#if UNITY_EDITOR
      EditorUtility.DisplayDialog("FramesController", msg, "确认", "取消");
#endif
  }
  /// <summary>
  /// Unity编辑器停止当前正在运行的程序
  /// </summary>
  private void EditorStop()
  {
#if UNITY_EDITOR
      UnityEditor.EditorApplication.isPlaying = false;
#endif
  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程教程。

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