UnityEngine.MonoBehaviour:.ctor()

我正在嘗試構建一個系統，該系統可以找到一個物件的最近位置并使用它來將 Player 轉換到特定位置。我明白這個問題，但我無法消除黃色感嘆號。該程式以某種方式運行，但我想看看解決方案。

根據 UnityConsole 的問題是：您正在嘗試使用“new”關鍵字創建 MonoBehaviour。這是不允許的。MonoBehaviours 只能使用 AddComponent() 添加。或者，您的腳本可以繼承自 ScriptableObject 或根本沒有基類 UnityEngine.MonoBehaviour:.ctor ()

腳本是：#1

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using System.Linq;

public class ScoreMultiplerFinder : MonoBehaviour

{
    private static ScoreMultiplerFinder instance;

    private List<GameObject> checkpoints = new List<GameObject>();

    public List<GameObject> Checkpoints { get { return checkpoints; } }

    public static ScoreMultiplerFinder Singleton
    {
        get
        {
            if (instance == null)
            {
                instance = new ScoreMultiplerFinder();
                instance.Checkpoints.AddRange(
                    GameObject.FindGameObjectsWithTag("Checkpoint"));

                instance.checkpoints = instance.checkpoints.OrderBy(waypoint => waypoint.name).ToList();
            }
            return instance;
        }
    }
}

#2(inPlayerObject)

 public void FindClosestMultiplier()
    {
        float lastDist = Mathf.Infinity;
        for (int i = 0; i < ScoreMultiplerFinder.Singleton.Checkpoints.Count; i  )
        {
            GameObject thisWP = ScoreMultiplerFinder.Singleton.Checkpoints[i];
            float distance = Vector3.Distance(transform.position, thisWP.transform.position);
            if (distance < lastDist)
            {
                currentIndex = i;
                lastDist = distance;
                lastScoreMultip.position = ScoreMultiplerFinder.Singleton.Checkpoints[currentIndex].transform.position;               
            }
        }      
    }

提前致謝，祝您有美好的一天！

uj5u.com熱心網友回復：

錯誤/警告幾乎告訴你該怎么做。延遲初始化單例的正確方法是

private List<GameObject> checkpoints;

// First of all be consequent and let nobody change the content of this
public IReadOnlyList<GameObject> Checkpoints => checkpoints;


public static ScoreMultiplerFinder Singleton
{
    get
    {
        if(instance) return instance;
        
        // before creating one check if there maybe is one already first
        instance = FindObjectOfType<ScoreMultiplerFinder>();

        if(instance) return instance;

        // GameObject is one of the very few UnityEngine.Object types where using 
        // "new" is actually okey 
        instance = new GameObject(nameof(ScoreMultiplerFinder)).AddComponent<ScoreMultiplerFinder>();
        
        return instance;
    }
}

private void Awake ()
{
    // Without this your "Singleton" is not complete and you rather only have a 
    // lazy factory property.
    // For a valid singleton pattern you have to make sure that there actually 
    // exists only one single instance at a time!
    if(instance && instance != this)
    {
        Destroy (gameObject);
        return;
    }

    instance = this;

    checkpoints = GameObject.FindGameObjectsWithTag("Checkpoint").OrderBy(waypoint => waypoint.name).ToList();
}

然后，如果您已經在使用 Linq，那么您已經熟悉OrderBy.

你的第二個腳本可以縮小到

public void FindClosestMultiplier()
{
    // Simply get the waypoints
    // - "OrderBy" them by distance. using the "sqrMagnitude" is faster and for ordering has exactly the same effect as 
    //   "Distance" which uses the more expensive "magnitude"
    // - use "FirstOrDefault" to get either the closest item or "null" if there wasn't any at all
    var closest = ScoreMultiplerFinder.Singleton.Checkpoints.OrderBy(c => (transform.position - c.transform.position).sqrMagnitude).FirstOrDefault();
   
    // Was there any at all? 
    if(!closest) return; 

    // Otherwise "closest" is the closest waypoint -> do something with it
    lastScoreMultip.position = closest.position;  
}

標籤：C＃ 林克 统一3d

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