GetComponent放在update函数中有NullReferenceException: Object reference not set to an instance of an object的错误
kingController.cs文件
using UnityEngine;
using System.Collections;
public class kingController : MonoBehaviour {
public float speed=3.0f;
public Animator animator;
CharacterController character;
public bool attack=false;
Vector3 Vspeed = Vector3.zero;
CollisionFlags collisionFlags;
public bool enemyAttack;
GameObject obj;
void Start () {
animator = GetComponent<Animator> ();
character = GetComponent<CharacterController> ();
AttackTest obj = GetComponent<AttackTest> ();
print (obj.attack.ToString());
enemyAttack = GetComponent<AttackTest> ().attack;//这句错误。。。。
}
// Update is called once per frame
void Update () {
//print ("king "+obj.transform.position.ToString ());
enemyAttack = GetComponent<AttackTest> ().attack;
目的是从另一个脚本中获取一个bool类型的值。脚本名是AttackTest（作用是检测武器打击到敌人）这两个脚本是绑定在同一个物体上。（不在一个绑定在同一个物体上有影响吗？）
AttackTest.cs文件
using UnityEngine;
using System.Collections;
public class AttackTest : MonoBehaviour {
Vector3 startPosition;
RaycastHit hitOut;
Collider[] hit;
public bool attack=false;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
//attack = false;
if (Input.GetMouseButtonDown (0)) {
startPosition = transform.position;
hit = Physics.OverlapSphere (startPosition, 1.0f, 1);
{
for(int i=0;i<=hit.Length-1;i++)
{
if(hit[i].tag=="Enemy")
{
//print ("attack!!!");
attack=true;
//print(attack.ToString());
break;
}
}
}
}
}

两个脚本是在同一个物体上吗？

同一个GameObject下可以直接GetComponent
不同GameObject下要先指定需要调用的GameObject