/**
* 销毁一个面板
* @param key 唯一标识
* @param newView 新面板
*/
public void destroy(int key, IBaseView newView = null)
{
IBaseView oldView = this.getView(key);
if (oldView != null)
{
this.unregister(key);
oldView.destroy();
oldView = null;
}
this.register(key, newView);
}