无法在C#/ Unity上加载鼠标光标纹理

时间:2014-09-18 23:28:51

标签: c# nullreferenceexception texture2d mouse-cursor

public class Cursor : MonoBehaviour 
{ 
     public Texture2D cursor; 
     public int cursorSizeX = 16; // default 
     public int cursorSizeY = 16; // default 

// Use this for initialization 
void Start () 
{ 
     Object temp = Resources.Load("Textures/CR_Cursor (Custom)"); 

     if (temp == null) 
     Debug.Log("Load Object Fail"); 

     cursor = (Texture2D)Resources.Load("Textures/CR_Cursor (Custom)"); 

     if (cursor == null) 
     Debug.Log("Load Cursor Fail"); 

     Screen.showCursor = false; 
} 

// Update is called once per frame 
void Update () 
{ 
     GUI.DrawTexture(new Rect(Event.current.mousePosition.x - cursorSizeX / 2,      Event.current.mousePosition.y - cursorSizeY / 2, cursorSizeX, cursorSizeY), cursor); 
} 

无论我在哪里实例化游标,我仍然得到NullReferenceException:对象引用未设置为对象的实例 Cursor.Update(),我缺少什么?

1 个答案:

答案 0 :(得分:2)

你应该把这一行

GUI.DrawTexture(new Rect(Event.current.mousePosition.x - cursorSizeX / 2,      Event.current.mousePosition.y - cursorSizeY / 2, cursorSizeX, cursorSizeY), cursor); 

在OnGUI()内部,而不是在Update

void OnGUI(){

GUI.DrawTexture(new Rect(Event.current.mousePosition.x - cursorSizeX / 2,      Event.current.mousePosition.y - cursorSizeY / 2, cursorSizeX, cursorSizeY), cursor); 

}

这是一个关于脚本生命周期的图表

Scripting Lifecycle