无法从“UnityEngine.GameObject”转换为“System.Predicate”<unityengine.gameobject> '</unityengine.gameobject>

Question

I am trying to find the index of a list item, but i can't get it to work.

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

public class ChunkLoader : MonoBehaviour
{
    public GameObject[] screens = {};
    public GameObject PlrSceen;
    public int chunk_index;
    // Start is called before the first frame update
    void Start()
    {
        chunk_index = screens.FindIndex(screens,PlrScreen);
    }
    // Update is called once per frame
    void Update()
    {
        
    }
}

Answer 1

Array.FindIndex expects a predicate to check for. This means you have to pass a method or lambda to be called. A Predicate is a method that gets passed a parameter T and returns a bool.

An example would be

chunk_index = screens.FindIndex(screens, go => go == PlrScreen);

However, I'd advise against that. You could use IndexOf instead, as it checks for the object instead for evaluating a predicate.