Unity GetComponent 导致错误答案

【问题标题】：Unity GetComponent causing errorUnity GetComponent 导致错误
【发布时间】：2015-07-19 08:32:09
【问题描述】：

所以我有一个非常基本的动画运动脚本，但我什至无法进入实际的动画部分，因为我遇到了这个错误：

Assets/Player Controllers/PlayerController.cs(18,41): error CS0119: Expression denotes a `type', where a `variable', `value' or `method group' was expected

直到今天它给我一个关于 GetComponent 的错误，但现在我什至无法复制它，尽管我没有更改任何一行代码。无论如何，这是完整的事情：

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour{
public float runSpeed = 6.0F;
public float jumpHeight = 8.0F;
public float gravity = 20.0F;

private Vector3 moveDirection = Vector3.zero;

void Start(){
    controller = GetComponent<CharacterController>();
    animController = GetComponent<Animator>();
}

void Update(){
    if(controller.isGrounded){
        moveDirection = Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
        moveDirection = transform.TransformDirection(moveDirection);
        moveDirection *= speed;

        if(moveDirection = Vector3.zero){//Stopped
            isWalking = false;
            isBackpedaling = false;
        }else if(moveDirection = Vector3.back){//Backpedaling
            animController.isWalking = false;
            animController.isBackpedaling = true;
        }else{//Walking
            animController.isWalking = true;
            animController.isBackpedaling = false;
        }

        if(Input.GetButton("Jump")){
            moveDirection.y = jumpSpeed;
        }
    }
    moveDirection.y -= gravity * Time.deltaTime;
    controller.Move(moveDirection * Time.deltaTime);
}
}

【问题讨论】：

标签： c# unity3d

【解决方案1】：

关于您遇到的错误，第 18 行：

moveDirection = Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));

应该是：

moveDirection = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));

您应该进行的另一个修复（我假设是您之前的 GetComponent 错误的根源）是未声明您在 Start() 方法中分配的变量。通过添加到顶部来声明它们，如下所示：

public class PlayerController : MonoBehaviour{
public float runSpeed = 6.0F;
public float jumpHeight = 8.0F;
public float gravity = 20.0F;

private Vector3 moveDirection = Vector3.zero;

// Added
private CharacterController controller;
private Animator animController;

【讨论】：