點擊上一個下一個按鈕的實現

 public List<Texture2D> texList = new List<Texture2D>();//我的list長度是5
    private int counts=0;
public void ClickNextBtn()
    {       
        if (counts==texList.Count)
        {
            counts = 4;//list長度減一
            return;
        }
        counts += 1;        
        if (counts<texList.Count)
        {
            ShowTextureNext(texList[counts]);           
        }       
    }
    public void ClickUpBtn()
    {               
        if (counts == 0)
        {
            return;
        }
        counts = counts - 1;      
        if (counts < texList.Count)
        {            
            ShowTextureNext(texList[counts]);            
        }      
    }