这两个方法都是必须要ViewController, 是建立在UINavigationController之上的。
SQLiteViewController *baSQLiteViewController = [[SQLiteViewController alloc] init];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:baSQLiteViewController];[self.window addSubview:nav.view];推出视图push，下一页面会自动添加返回按钮
InforViewController *baInforViewController = [[InforViewController alloc] init];[self.navigationController pushViewController:baInforViewController animated:YES];
以Modal方式推出一个视图，弹出的视图没有返回按钮，需要自己添加
NewDataViewController *baNewViewController = [[NewDataViewController alloc] init];UINavigationController *baNavigation = [[UINavigationController alloc] initWithRootViewController:baNewViewController];[self.navigationController presentModalViewController:baNavigation animated:YES];[baNewViewController release];[baNavigation release];为弹出视图添加返回按钮
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStyleDone target:self action:@selector(returnView)];返回方法
- (void)returnView{
[self.parentViewController dismissModalViewControllerAnimated:YES];} 总结：1 将需要present(需要弹出来的）的ViewController先添加加到一个新的UINavigationController的RootView中，例如
NewDataViewController *baNewViewController = [[NewDataViewController alloc] init]; //需要弹出的ViewController
UINavigationController *baNavigation = [[UINavigationController alloc] initWithRootViewController:baNewViewController];//实例化一个NavigationController对象，这个对象使用将要弹出ViewController作为RootView Controlller初始化。 2. 然后present这个UINavigationController，接着就可以继续push了，当返回到present还可以缩回去 右侧进入BaseInfoEdit *View = [[BaseInfoEdit alloc] initWithNibName:@"BaseInfo" bundle:nil];
[self.navigationController pushViewController:View animated:YES];
返回方法
[self.navigationController popViewControllerAnimated:YES];
下方进入OilRecordAdd *View = [[OilRecordAdd alloc] initWithNibName:@"OilRecordDetail" bundle:nil];
[self.navigationController presentModalViewController:Nav animated:YES];
返回方法
[self.navigationController dismissModalViewControllerAnimated:YES];
leftBarButtonItem和rightBarButtonItem设置的是本级页面上的BarButtonItem，backBarButtonItem设置的是下一级页面上的BarButtonItem比如：两个ViewController，主A和子B，我们想在A上显示“刷新”的右BarButton，B上的BackButton显示为“撤退”就应该在A的viewDidLoad类似方法中写：UIBarButtonItem *refreshButton = [[UIBarButtonItem alloc] initWithTitle:@"刷新" style:UIBarButtonItemStylePlain target:self action:nil];
self.navigationItem.rightBarButtonItem = refreshButton;
UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithTitle:@"撤退" style:UIBarButtonItemStylePlain target:self action:nil];
self.navigationItem.backBarButtonItem = cancelButton;B不需要做任何处理
然后A push B就可以了