/// <summary>
/// 移除订阅者
/// </summary>
/// <param name="observer"></param>
public void RemoveObserver(IUpdateText observer)
{
if (!_observers.Contains(observer)) return;
_observers.Remove(observer);
}
/// <summary>
/// 添加订阅者
/// </summary>
/// <param name="observer"></param>
public void AttachObserver(IUpdateText observer)
{
_observers.Add(observer);
}
