Unity 聊天室内容自适应

效果如下：

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

public class Chat02 : MonoBehaviour
{
    public InputField chatInput;    //消息输入框
    public GameObject ChatTextArea; //消息预制体
    public Transform textShowContent; //消息父物体
    public ScrollRect scrollRect;

    string username = "admin";

    // Update is called once per frame
    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Return) || Input.GetKeyDown(KeyCode.KeypadEnter))
        {
            if (chatInput.text != "")
            {
                string addText = "<color=red>" + username + "</color>:" + chatInput.text;
                GameObject chatTextArea = GameObject.Instantiate(ChatTextArea, textShowContent);//也可以Resources.load预制体
                chatTextArea.SetActive(true);
                Text text = chatTextArea.GetComponent<Text>();
                text.text = addText;
                chatInput.text = "";
                chatInput.ActivateInputField();
                //强制更新，如果滚动条显示了，让滚动条始终在最低下。
                Canvas.ForceUpdateCanvases();
                scrollRect.verticalNormalizedPosition = 0f;
                Canvas.ForceUpdateCanvases();
            }
        }
    }

}