How is the “OnDestroy” function used in Unity?

In Unity, OnDestroy is a method in the MonoBehaviour class. This method is called when an object is destroyed.

OnDestroy is typically used to clean up resources that need to be released before an object is destroyed, such as stopping coroutines, unsubscribing from events, closing files, and so on. This helps prevent resource leaks and potential errors.

Here is an example code demonstrating the usage of the OnDestroy method:

using UnityEngine;

public class MyScript : MonoBehaviour
{
    private void OnDestroy()
    {
        // 清理资源
        // 停止协程
        StopAllCoroutines();
        
        // 取消订阅事件
        EventManager.OnEvent -= EventHandler;
        
        // 关闭文件
        File.Close();
    }
    
    private void EventHandler()
    {
        // 处理事件
    }
}

In the above code, the OnDestroy method is called when the object is destroyed. Within this method, all coroutines are stopped, an event subscription is cancelled, and a file is closed. This ensures that the necessary resources are properly released when the object is destroyed.

Simply put, the OnDestroy method in Unity is used to clean up resources and perform any necessary actions to ensure correct behavior when an object is destroyed.