我正在关注制作游戏课程并且我在m代码中一直出错，而且我不知道如何修复它。这是问题代码：
private void Flip()
{
// Switch the way the player is labelled as facing.
m_FacingRight = !m_FacingRight;
// Multiply the player's x local scale by -1.
Vector3 theScale = playerGraphics.localScale;
theScale.x *= -1;
playerGraphics.localScale = theScale;
}
}
我收到错误“Null Reference Exception：Object reference not not set to a object of object”。我需要做些什么来解决它？
以下是我的所有代码：
使用System; 使用UnityEngine;
命名空间UnityStandardAssets._2D { 公共类PlatformerCharacter2D：MonoBehaviour { [SerializeField] private float m_MaxSpeed = 10f; //玩家可以在x轴上行进的最快速度。 [SerializeField] private float m_JumpForce = 400f; //当玩家跳跃时添加的力量。 [Range（0,1）] [SerializeField] private float m_CrouchSpeed = .36f; //应用于蹲伏运动的maxSpeed数量。 1 = 100％ [SerializeField] private bool m_AirControl = false; //一名球员是否可以在跳跃时转向; [SerializeField] private LayerMask m_WhatIsGround; //确定角色的基础的面具
private Transform m_GroundCheck; // A position marking where to check if the player is grounded.
const float k_GroundedRadius = .2f; // Radius of the overlap circle to determine if grounded
private bool m_Grounded; // Whether or not the player is grounded.
private Transform m_CeilingCheck; // A position marking where to check for ceilings
const float k_CeilingRadius = .01f; // Radius of the overlap circle to determine if the player can stand up
private Animator m_Anim; // Reference to the player's animator component.
private Rigidbody2D m_Rigidbody2D;
private bool m_FacingRight = true; // For determining which way the player is currently facing.
Transform playerGraphics; // Be a reference to the graphics so we can change direction
public object PlayerCharacter2d { get; private set; }
private void Awake()
{
// Setting up references.
m_GroundCheck = transform.Find("GroundCheck");
m_CeilingCheck = transform.Find("CeilingCheck");
m_Anim = GetComponent<Animator>();
m_Rigidbody2D = GetComponent<Rigidbody2D>();
playerGraphics = transform.FindChild("Graphics");
if (playerGraphics = null)
{
Debug.LogError("Let's freak out! There is no 'Graphics' object as a child of the player");
}
}
private void FixedUpdate()
{
m_Grounded = false;
// The player is grounded if a circlecast to the groundcheck position hits anything designated as ground
// This can be done using layers instead but Sample Assets will not overwrite your project settings.
Collider2D[] colliders = Physics2D.OverlapCircleAll(m_GroundCheck.position, k_GroundedRadius, m_WhatIsGround);
for (int i = 0; i < colliders.Length; i++)
{
if (colliders[i].gameObject != gameObject)
m_Grounded = true;
}
m_Anim.SetBool("Ground", m_Grounded);
// Set the vertical animation
m_Anim.SetFloat("vSpeed", m_Rigidbody2D.velocity.y);
}
public void Move(float move, bool crouch, bool jump)
{
// If crouching, check to see if the character can stand up
if (!crouch && m_Anim.GetBool("Crouch"))
{
// If the character has a ceiling preventing them from standing up, keep them crouching
if (Physics2D.OverlapCircle(m_CeilingCheck.position, k_CeilingRadius, m_WhatIsGround))
{
crouch = true;
}
}
// Set whether or not the character is crouching in the animator
m_Anim.SetBool("Crouch", crouch);
//only control the player if grounded or airControl is turned on
if (m_Grounded || m_AirControl)
{
// Reduce the speed if crouching by the crouchSpeed multiplier
move = (crouch ? move*m_CrouchSpeed : move);
// The Speed animator parameter is set to the absolute value of the horizontal input.
m_Anim.SetFloat("Speed", Mathf.Abs(move));
// Move the character
m_Rigidbody2D.velocity = new Vector2(move*m_MaxSpeed, m_Rigidbody2D.velocity.y);
// If the input is moving the player right and the player is facing left...
if (move > 0 && !m_FacingRight)
{
// ... flip the player.
Flip();
}
// Otherwise if the input is moving the player left and the player is facing right...
else if (move < 0 && m_FacingRight)
{
// ... flip the player.
Flip();
}
}
// If the player should jump...
if (m_Grounded && jump && m_Anim.GetBool("Ground"))
{
// Add a vertical force to the player.
m_Grounded = false;
m_Anim.SetBool("Ground", false);
m_Rigidbody2D.AddForce(new Vector2(0f, m_JumpForce));
}
}
private void Flip()
{
// Switch the way the player is labelled as facing.
m_FacingRight = !m_FacingRight;
// Multiply the player's x local scale by -1.
Vector3 theScale = playerGraphics.localScale;
theScale.x *= -1;
playerGraphics.localScale = theScale;
}
}
}