Understanding and small examples of unity3d object pool

Studying recently Unity3D, Making a Parkour Demo When , Find and constantly initialize obstacles and delete obstacles comparison card , Later, I studied the object pool , It's been a long time , I finally got it . Now write it down , I hope I can help novices like me , If there's something wrong , Please correct me ！

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unity3D First knowledge of object pool technology

The concept of object pool ： When you activate an object , It's extracted from the pool . When deactivating an object , It goes back into the pool , Waiting for the next request .（ From Baidu ）;

background ： Parkour , There are obstacles on the road , The obstacle behind the character disappears , Randomly generate obstacles in front of the character

The three most basic things you need ：

1、 A pool ： Used to hold what you need , And recycled items ;

2、 A way to get things ;

3、 A way to put things ;

With this 3 things , You can build an object pool

The following is the complete code section , There are detailed notes

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


public class GameObjectPool : MonoBehaviour {

	// Use this for initialization

    // The singleton pattern , If you don't know, you can baidu , There is no explanation here , Because the level is limited 
    public static GameObjectPool instance;
    
    // Use a dictionary to construct your pool , In the dictionary String It's the name of the pit , Each pit corresponds to one GameObject list 
    Dictionary<string, List<GameObject>> pool = new Dictionary<string, List<GameObject>>() { };

	void Start () {
        instance = this;// The singleton pattern 
	}

    // The way to get objects from the pool , Pass two parameters , What you need to get , And where you need to put it 
    // The object you need should be preset 
    public GameObject GetPool(GameObject go,Vector3 position)
    {
        string key = go.name+"(Clone)";// The name of the pit to get something 

        GameObject rongqi; // The container you use to take objects ;


        // The following is divided into three cases to analyze 
        if (pool.ContainsKey(key) && pool[key].Count > 0)// If the pit exists , There's something in the pit 
        { 
            // Just take the first one in the pit 
            rongqi = pool[key][0];
            pool[key].RemoveAt(0);// Release the first position ;
        }
        else if (pool.ContainsKey(key) && pool[key].Count <= 0)// Pit existence , There's nothing in the pit 
        {
            // Then initialize one directly 
            rongqi = Instantiate(go,position,Quaternion.identity) as GameObject;
        }
        else  // No pit 
        { 
            // Not only to initialize , And add... To the pit 
            rongqi = Instantiate(go, position, Quaternion.identity) as GameObject;
            pool.Add(key, new List<GameObject>() { });
        }

        // Adjust the initial state of the object 
        rongqi.SetActive(true);

        // Here I add a code that also displays sub objects , You don't have to add 
        foreach (Transform child in rongqi.transform)
        {
            child.gameObject.SetActive(true);
        }

        // Position initialization 
        rongqi.transform.position = position;
        return rongqi;
    }

    // The way to put it in the pool 
    public void IntoPool(GameObject go)
    {
        // In theory, all our things are taken out of the pit , So there must be a pit when you put the object in , It can be put directly into , Don't divide the situation 
        string key = go.name;
        pool[key].Add(go);
        go.SetActive(false);
    }
    
}

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