如何给一个ToolBar添加按钮

[cpp]viewplaincopy//首先需要创建一个NSMutableArrayNSMutableArray*buttons=[[NSMutableArrayalloc]initWithCapacity:3];[buttonsautorelease];//创建一个UIBarButtonItem系统刷新按钮并且加入到Array中UIBarButtonItem*freshButton=[[UIBarButtonItemalloc]initWithBarButtonSyst