unity3d DOTween动画实现数字变化动画

　　在游戏中，经常有这样的需要数字从1逐步增加到一个值N，而动画由1到这个值N的变化过程中，每变化一次，都是有动画，但是往往这个动画还没结束，下个动画就来了。想解决这个问题，可以使用下面这个思路。

即这个动画没播完之前，下个动画不能播，播完一个动画后，再进行下一个。下面请看代码。

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using DG.Tweening;

public class InGameFlowerItem : MonoBehaviour
{
    public uint m_ID;
    public string m_SenderName = "";
    public int m_Num = 0;//已经送花的数量
    public Text m_NameText;
    public Text m_NumText;
    public float m_RemoveTime = 5f;
    Tweener m_Tweener;
    private int m_tweenNum = 0;
    private bool flag = false;

    public void Show()
    {
        gameObject.SetActive(true);
        m_NameText.text = m_SenderName;
        if (m_Num <= 5)
        {
            m_NumText.text = m_Num.ToString();
       }
        this.Invoke("RemoveSelf", m_RemoveTime);
    }

    public void AddNum()
    {
        this.CancelInvoke("RemoveSelf");
        this.Invoke("RemoveSelf", m_RemoveTime);
        if (m_Num > 5) //处理文字动画
        {
            m_tweenNum++;
        }
        else {
            m_Num++;
        }
    }

    void DoTween() {
        if (m_tweenNum <= 0)
        {
            flag = false;
            return;
        }
        if (m_Tweener != null && m_Tweener.IsPlaying())
        {
            return;
        }
        m_Tweener = m_NumText.transform.DOScale(3f, 0.25f).SetEase(Ease.InBack).OnComplete(() =>
        {
            m_NumText.text = (++m_Num).ToString();
            m_NumText.transform.DOScale(1f, 0.25f).OnComplete(() => {
                m_tweenNum--;
                DoTween();
            });
        });
    }

    // Update is called once per frame
    void Update()
    {
        if (m_tweenNum > 0 && !flag)
        {
            flag = true;
            DoTween();
        }
    }

    void OnDisable()
    {
        m_Tweener.Kill();
    }

    public void InitData(uint id,string senderName ,int num)
    {
        m_ID = id;
        m_SenderName = senderName;
        m_Num = num;
    }

    public void RemoveSelf()
    {
        InGameFlowerPanel.Inst.ClearFlowerItem(m_ID);
        this.CancelInvoke("RemoveSelf");
        Destroy(gameObject);
    }

}