GHZMRNavigator/Assets/Scripts/ViewUI/SetTextV.cs

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

public class SetTextV : MonoBehaviour
{
    public Text text;
    public Image bj;
    public RectTransform textRect;
    public RectTransform canvas;
    private Vector2 canvasSize;

    private void Start()
    {
        canvasSize = new Vector2(canvas.rect.width, canvas.rect.height);
    }
    public void SetText(string str)
    {
        if (str.Length > 100)
            text.fontSize = 20 - ((str.Length - 100) / 50 + 1) * 2;
        this.text.text = str;
    }

    public void SetBackGround (Sprite bj)
    {
        this.bj.sprite = bj;
    }

    private void FixedUpdate()
    {
        canvasSize.y = textRect.sizeDelta.y + 60;
        canvas.sizeDelta = canvasSize;
    }
}