在ViewController页面用代码添加UINavigationBar

CGRect aScreenRect = [[UIScreen mainScreen] bounds];

//建立navbar
UINavigationBar *nav = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, aScreenRect.size.width, 44)];
//建立navbaritem
UINavigationItem *NavTitle = [[UINavigationItem alloc] initWithTitle:@"详细介绍"];

[nav pushNavigationItem:NavTitle animated:YES];

[self.view addSubview:nav];

//建立barbutton 建立系统样式的
UIBarButtonItem *item = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemReply target:self action:@selector(navBackBt:)];

//设置barbutton
NavTitle.leftBarButtonItem = item;
[nav setItems:[NSArray arrayWithObject:NavTitle]];

[item release];
[NavTitle release];
[nav release];