Iphone 如何在导航控制器中添加选项卡项？

我正在开发基于导航的应用程序……首先，当我按下“警报”按钮时……它会显示标签、按钮、图像和选项卡栏下的项目……我们如何添加选项卡栏项目？

最多用途的方法是添加透明的UIView，然后向其中添加任何内容：

UIView *buttonsHandlerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 50)];
buttonsHandlerView.backgroundColor = [UIColor clearColor];
UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:buttonsHandlerView];
[self.navigationItem setRightBarButtonItem:backButtonItem animated:YES];
[backButtonItem release];

//[buttonsHandlerView addSubview:__anything__];

[buttonsHandlerView release];

或者使用title/type初始化UIBarButtonim并将其用作按钮