/// <summary>
 ///  item 回调
 /// </summary>
 /// <param name="index"></param>
 public void ItemCallback(int index)
 {
     currentIndex = index;
     for (int i = 0; i < list.Count; i++)
     {
         ToggleCell item = list[i];
         if (currentIndex == item.index)
         {
             item.StartSelect(true);
             callback(currentIndex);
         }
         else
         {
             item.StartSelect(false);
         }
     }
 }
 /// <summary>
 ///  添加item
 /// </summary>
 /// <param name="it"></param>
 public void AddToggleItem(ToggleCell it)
 {
     it.center = this;
     list.Add(it);
 }