Unity实现微信聊天框界面

using UnityEngine;
using UnityEngine.UI;
 
public class ChatPanelManager : MonoBehaviour
{
    public GameObject leftBubblePrefab;
    public GameObject rightBubblePrefab;
 
    private ScrollRect scrollRect;
    private Scrollbar scrollbar;
    
    private RectTransfORM content;
 
    [SerializeField] 
    private float stepVertical; //上下两个气泡的垂直间隔
    [SerializeField] 
    private float stepHorizontal; //左右两个气泡的水平间隔
    [SerializeField]
    private float maxTextWidth;//文本内容的最大宽度
 
    private float lastPos; //上一个气泡最下方的位置
    private float halfHeadLength;//头像高度的一半
 
    public void Init()
    {
        scrollRect = GetComponentInChildren<ScrollRect>();
        scrollbar = GetComponentInChildren<Scrollbar>();
        content = transform.Find("ViewPort").Find("Content").GetComponent<RectTransform>();
        lastPos = 0;
        halfHeadLength = leftBubblePrefab.transform.Find("head").GetComponent<RectTransform>().rect.height / 2;
    }
 
    public void AddBubble(string content, bool isMy)
    {
        GameObject newBubble = isMy ? Instantiate(rightBubblePrefab, this.content) : Instantiate(leftBubblePrefab, this.content);
        //设置气泡内容
        Text text = newBubble.GetComponentInChildren<Text>();
        text.text = content;
        if (text.preferredWidth > maxTextWidth)
        {
            text.GetComponent<LayoutElement>().preferredWidth = maxTextWidth;
        }
        //计算气泡的水平位置
        float hPos = isMy ? stepHorizontal / 2 : -stepHorizontal / 2;
        //计算气泡的垂直位置
        float vPos = - stepVertical - halfHeadLength + lastPos;
        newBubble.transform.localPosition = new Vector2(hPos, vPos);
        //更新lastPos
        Image bubbleImage = newBubble.GetComponentInChildren<Image>();
        float imageLength = GetContentSizeFitterPreferredSize(bubbleImage.GetComponent<RectTransform>(), bubbleImage.GetComponent<ContentSizeFitter>()).y;
        lastPos = vPos - imageLength;
        //更新content的长度
        if (-lastPos > this.content.rect.height)
        {
            this.content.sizeDelta = new Vector2(this.content.rect.width, -lastPos);
        }
 
        scrollRect.verticalNormalizedPosition = 0;//使滑动条滚轮在最下方
    }
 
    public Vector2 GetContentSizeFitterPreferredSize(RectTransform rect, ContentSizeFitter contentSizeFitter)
    {
        LayoutRebuilder.ForceRebuildLayoutImmediate(rect);
        return new Vector2(HandleSelfFittingAlongAxis(0, rect, contentSizeFitter),
            HandleSelfFittingAlongAxis(1, rect, contentSizeFitter));
    }
 
    private float HandleSelfFittingAlongAxis(int axis, RectTransform rect, ContentSizeFitter contentSizeFitter)
    {
        ContentSizeFitter.FitMode fitting =
            (axis == 0 ? contentSizeFitter.horizontalFit : contentSizeFitter.verticalFit);
        if (fitting == ContentSizeFitter.FitMode.MinSize)
        {
            return LayoutUtility.GetMinSize(rect, axis);
        }
        else
        {
            return LayoutUtility.GetPreferredSize(rect, axis);
        }
    }
}

using System.Collections.Generic;
using UnityEngine;
 
 
public class test : MonoBehaviour
{
    public ChatPanelManager cpm;
    private int count;
    private List<string> dialogue = new List<string>();
    void Start()
    {
        cpm.Init();
        dialogue.Add("永恒之星");
        dialogue.Add("永恒之星永恒之星");
        dialogue.Add("永恒之星永恒之星永恒之星");
        dialogue.Add("永恒之星永恒之星永恒之星永恒之星");
        dialogue.Add("永恒之星永恒之星永恒之星永恒之星永恒之星");
        dialogue.Add("永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星");
        dialogue.Add("永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星");
        dialogue.Add("永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星");
        dialogue.Add("永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星");
        dialogue.Add("永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星永恒之星");
    }
 
    void Update()
    {
        if (Input.GeTKEyDown(KeyCode.Space))
        {
           cpm.AddBubble(dialogue[count],Random.Range(0,2)>0);
           count++;
           if (count > dialogue.Count-1)
           {
               count = 0;
           }
        }
    }
}