/// <summary>
/// UI的入栈操作，此操作会显示一个面板
/// </summary>
/// <param name="nextPanel">要显示的面板</param>
public void Push(BasePanel nextPanel)
{
if (stackPanel.Count > 0)
{
panel = stackPanel.Peek();
panel.OnPause();
}
stackPanel.Push(nextPanel);
GameObject panelGo = uiManager.GetSingleUI(nextPanel.UIType);
nextPanel.Initialize(new UITool(panelGo));
nextPanel.Initialize(this);
nextPanel.Initialize(uiManager);
nextPanel.OnEnter();
}