Iphone 来自初始视图控制器的导航栏上的PushViewController和Popview控制器

我不熟悉iphone。我对uinavigation控制器有一点困惑，那就是我希望在初始视图控制器中有一个导航栏在该视图控制器中，当我们单击导航栏上的一个按钮时，它将按下另一个视图控制器（第二个视图控制器）如果我们点击这个按钮，就会有一个后退按钮，我想弹出那个视图控制器，然后回到初始视图控制器。如果有人知道这一点，请帮助我。如果你用一些代码解释的话，会更好地理解我们

到目前为止，我已经编写了以下代码，其中显示模式视图控制器和模型视图控制器正在工作，但pushview控制器和popview控制器不工作

在appDelegate中，我是这样写的

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
        //create a window
        self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

        //biblePlayerController is an instance of BiblePlayerViewController class and then set the biblePlayerController as a rootViewController to the window
        self.biblePlayerController = [[BiblePlayerViewController alloc] initWithNibName:@"BiblePlayerViewController" bundle:nil];

       navigationController = [[UINavigationController alloc]initWithRootViewController:self.biblePlayerController];

      // self.window.rootViewController = self.biblePlayerController;
        [self.window addSubview:navigationController.view];  
//make the window visible
        [self.window makeKeyAndVisible];

        return YES;   

}   

//In initial View controller there is a navigation on that there is a download button code for that is 

//BiblePlayerViewController.m
 UIBarButtonItem *downloadButton = [[UIBarButtonItem alloc] initWithTitle:@"Download" style:UIBarButtonItemStylePlain target:self action:@selector(gotoProgressViewController:)];
        self.navigationItem.rightBarButtonItem = downloadButton;

- (IBAction)gotoProgressViewController:(id)sender {
    @try {

        //ShowProgressViewCont is initialized with the nibName
        showProgressViewController = [[ShowProgressViewCont alloc]initWithNibName:@"ShowProgressViewCont" bundle:nil];

        //UINavigationController is initialized with the rootViewController showProgressViewController
        navigationController = [[UINavigationController alloc]initWithRootViewController:showProgressViewController]; 

        //The transition style of the navigationController is set to UIModalTransitionStyleCrossDissolve
        navigationController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;

        //Presents a modal view managed by the given view controller to the user.Here navigation Controller that manages the modal view.
        [self presentModalViewController:navigationController animated:YES];
      //  [navigationController pushViewController:showProgressViewController animated:YES];
    }
    @catch(NSException * e){NSLog(@"Exception At10: %s %d %s %s %@",__FILE__,__LINE__,__PRETTY_FUNCTION__,__FUNCTION__,e);}@finally{}
}

---

在上面的代码中，presentModalViewController正在工作，但pushViewController不工作。为什么。如果有人知道这一点，请帮助我。

假设您在ParentViewController中，通过按Child Btn，您希望转到ChildViewController

- (void) childBtnPressed : (id) sender
{
     ChildViewController *makeNewObject = [[ChildViewController alloc] initWithNibName:@"ChildViewController" bundle:nil];
     [self.navigationController pushViewController:makeNewObject animated:YES];
     [makeNewObject release];
}

- (void) backBtnPressed : (id) sender
{
    [self.navigationController popViewControllerAnimated:YES];
}

现在，在ChildViewController.m文件中，在Back Btn操作中写入此命令，以返回到父视图控制器

- (void) childBtnPressed : (id) sender
{
     ChildViewController *makeNewObject = [[ChildViewController alloc] initWithNibName:@"ChildViewController" bundle:nil];
     [self.navigationController pushViewController:makeNewObject animated:YES];
     [makeNewObject release];
}

- (void) backBtnPressed : (id) sender
{
    [self.navigationController popViewControllerAnimated:YES];
}

---

单击导航栏中的按钮后，按Next View

- (IBAction)NextViewAction:(id) sender
{
     NextViewController *NxtView = [[NextViewController alloc] initWithNibName:@"NextViewController" bundle:nil];
     [self.navigationController pushViewController:NxtView animated:YES];
     [NxtView release];
}

从NextViewController弹出

[self.navigationController popViewControllerAnimated:YES];