unity实现日历点击选择日期功能

先上代码：

 public List<Button> btnList = new List<Button>();
    public Text chooseDay;

    public int year;
    public int month;

    private void Start()
    {
        InitilCalender();
    }

    /// 

    /// 初始化日历
    /// 
    private void InitilCalender()
    {
        for (int i = 0; i < btnList.Count; i++)
        {
            var tempBtn = btnList[i];
            tempBtn.interactable = false;
            tempBtn.transform.GetChild(0).GetComponent<Text>().text = string.Empty;
        }

        var days = DateTime.DaysInMonth(year, month);

        List<int> intList = new List<int>();
        int index = 0;
        for (int i = 1; i < days + 1; i++) 
        {
            var tempDate = year.ToString() + "-" + month.ToString() + "-" + i.ToString();
            int num = Week2Num(DateTime.Parse(tempDate).DayOfWeek);
            if (i == 1) 
            {
                if(num == 7)
                {
                    num -= 1;
                    index++;
                }
                else
                {
                    num -= 1;
                }
            }
            else
            {
                if (num == 7)
                {
                    num = 7 * index + num - 1;
                    index++;
                }
                else
                {
                    num = 7 * index + num - 1;
                }
            }
            var tempBtn = btnList[num];
            tempBtn.interactable = true;
            tempBtn.transform.GetChild(0).GetComponent<Text>().text = i.ToString("00");
            tempBtn.onClick.AddListener(BtnClick);
        }
    }

    private void BtnClick()
    {
        var curBtn = EventSystem.current.currentSelectedGameObject;
        var curDay = int.Parse(curBtn.transform.GetChild(0).GetComponent<Text>().text);

        chooseDay.text = year.ToString() + "-" + month.ToString("00") + "-" + curDay.ToString("00");
    }

    private int Week2Num(DayOfWeek dayOfWeek)
    {
        int num = 0;
        switch (dayOfWeek)
        {
            case DayOfWeek.Friday:
                num = 5;
                break;
            case DayOfWeek.Monday:
                num = 1;
                break;
            case DayOfWeek.Saturday:
                num = 6;
                break;
            case DayOfWeek.Sunday:
                num = 7;
                break;
            case DayOfWeek.Thursday:
                num = 4;
                break;
            case DayOfWeek.Tuesday:
                num = 2;
                break;
            case DayOfWeek.Wednesday:
                num = 3;
                break;
        }
        return num;
    } 

再上UI: