我有两个统一的TMP_InputField。我试图自动聚焦并激活另一个，一旦第一个有输入。我尝试了以下方法，但由于某些原因，它对我不起作用。

using UnityEngine;
using UnityEngine.UI;
using TMPro;
using UnityEngine.EventSystems;

public class FocusBox : MonoBehaviour
{
    public TMP_InputField b1;
    public TMP_InputField b2;
 
    // Update is called once per frame
    private void Update()
    {
        if (b1.isFocused)
        {
            if (b1.text.Length > 0)
            {
                b2.Select();
                b1.DeactivateInputField();
            }

        }
        Debug.Log("is b1 focused after : " + b1.isFocused);

    }

}