ITrackableEventHandler在新版Vuforia失效，求替代方案及报错解决

问题原因 #

Vuforia 10及以上版本移除了ITrackableEventHandler接口，旧版TrackableBehaviour的用法也有调整，导致旧脚本出现类型找不到的报错。

替代方案 #

以下两种方式可实现原脚本的跟踪状态监听逻辑：

方式1：使用官方推荐的ITrackableStatusObserver接口 #

替换原ITrackableEventHandler接口，实现状态监听：

using UnityEngine;
using UnityEngine.UI;
using Vuforia;

public class IoT : MonoBehaviour, ITrackableStatusObserver
{
    public GameObject imageTarget;
    private TrackableBehaviour mTrackableBehaviour;
    private bool targetFound = false;
    public GameObject hide;

    void Start()
    {
        mTrackableBehaviour = imageTarget.GetComponent<TrackableBehaviour>();
        if (mTrackableBehaviour != null)
        {
            mTrackableBehaviour.RegisterTrackableStatusObserver(this);
        }
    }

    void OnDestroy()
    {
        if (mTrackableBehaviour != null)
        {
            mTrackableBehaviour.UnregisterTrackableStatusObserver(this);
        }
    }

    public void OnTrackableStatusChanged(
        TrackableBehaviour.Status previousStatus,
        TrackableBehaviour.Status newStatus)
    {
        if (newStatus == TrackableBehaviour.Status.DETECTED ||
            newStatus == TrackableBehaviour.Status.TRACKED ||
            newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)
        {
            OnTargetFound();
        }
        else
        {
            OnTargetLost();
        }
    }

    void OnTargetFound()
    {
        targetFound = true;
        if (hide != null)
            hide.SetActive(false);
    }

    void OnTargetLost()
    {
        targetFound = false;
        if (hide != null)
            hide.SetActive(true);
    }
}

方式2：直接订阅状态变化事件 #

无需实现接口，通过事件绑定完成监听：

using UnityEngine;
using UnityEngine.UI;
using Vuforia;

public class IoT : MonoBehaviour
{
    public GameObject imageTarget;
    private TrackableBehaviour mTrackableBehaviour;
    private bool targetFound = false;
    public GameObject hide;

    void Start()
    {
        mTrackableBehaviour = imageTarget.GetComponent<TrackableBehaviour>();
        if (mTrackableBehaviour != null)
        {
            mTrackableBehaviour.OnTrackableStatusChanged += OnTrackableStatusChanged;
        }
    }

    void OnDestroy()
    {
        if (mTrackableBehaviour != null)
        {
            mTrackableBehaviour.OnTrackableStatusChanged -= OnTrackableStatusChanged;
        }
    }

    void OnTrackableStatusChanged(
        TrackableBehaviour.Status previousStatus,
        TrackableBehaviour.Status newStatus)
    {
        if (newStatus == TrackableBehaviour.Status.DETECTED ||
            newStatus == TrackableBehaviour.Status.TRACKED ||
            newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)
        {
            targetFound = true;
            if (hide != null)
                hide.SetActive(false);
        }
        else
        {
            targetFound = false;
            if (hide != null)
                hide.SetActive(true);
        }
    }
}

额外注意事项 #

• 确保Unity中已正确导入最新版Vuforia包，且保留using Vuforia;命名空间引用。
• 若TrackableBehaviour仍报错，可替换为ImageTargetBehaviour（图像目标的子类，用法完全一致）。

内容的提问来源于stack exchange，提问作者Sol