如何重置UINavigationController？

Question

我有一个涉及UINavigationController的问题.

我有一个应用程序有三个视图控制器,我正在使用导航控制器推送和弹出功能切换.

问题是这样的:我站在第三个视图控制器中并调用
[self.navigationController popToRootViewControllerAnimated:YES];
这将我带到第一个视图控制器(这正是我想要的)但是当我尝试导航到第二个视图控制器时,由于某种原因我最终在第三个视图控制器中.

有什么方法可以重置导航控制器,或者我这样做是错误的吗？

这是我用来推送和弹出导航控制器的代码:

当用户决定启动摄像机时,在根视图控制器中调用以下代码.

if(self.cameraViewController == nil)
{
        CollageCameraViewController *camView = [[CollageCameraViewController alloc] init];//WithNibName:nil bundle:[NSBundle mainBundle]];
        self.cameraViewController = camView;
        [camView release];

}
[self.navigationController pushViewController:self.cameraViewController animated:NO];

在用户拍摄完照片后,从CollageCameraViewController(第二个)调用以下代码:

if(self.renderView == nil)
{
    CollageRenderViewController *renderViewController = [[CollageRenderViewController alloc] initWithNibName:nil bundle:[NSBundle mainBundle]];
    self.renderView = renderViewController;
    [renderViewController release];
}
[self.navigationController pushViewController:self.renderView animated:YES];

当用户决定返回主(根)视图时,从CollageRenderViewController调用以下代码:

[self.navigationController popToRootViewControllerAnimated:YES];

现在,如果我再次尝试推送CollageCameraViewController,我最终会在CollageRenderViewController中,为什么呢？

干杯,安德烈亚斯

Answer 1

在移动到真正的主屏幕之前,我的堆栈中有几个VC作为设置屏幕.

我让我这样工作:

HomeViewController *hvc = [[HomeViewController alloc] init];
[self.navigationController pushViewController:hvc animated:YES];
self.navigationController.viewControllers = [[NSArray alloc] initWithObjects:hvc, nil];

我按下HomeViewController,然后重写堆栈只有主屏幕.

Answer 2

一旦弹出到根视图控制器，它就会“重置”。您对 navigationController 的下一个操作应该是推送（或重新推送）适当的视图控制器。您不应该尝试在堆栈中“导航”。

更新：

我创建了一个基于导航的 iPhone 项目来测试您的代码并且它有效。我的三个视图中的每一个都有一个按钮，当点击该按钮时，该按钮会向其控制器发送 IBAction 消息。

这是我的代码：

根视图控制器.h：

@class SecondViewController;

@interface RootViewController : UIViewController {
    SecondViewController *secondViewController;
}

@property (nonatomic, retain) SecondViewController *secondViewController;

- (IBAction)pushSecondVC;

@end

根视图控制器.m：

#import "RootViewController.h"
#import "SecondViewController.h"

@implementation RootViewController

@synthesize secondViewController;

- (IBAction)pushSecondVC {
    if(self.secondViewController == nil)
    {
        SecondViewController *secondVC = [[SecondViewController alloc] init];
        self.secondViewController = secondVC;
        [secondVC release];
    }
    [self.navigationController pushViewController:self.secondViewController animated:NO];
}

- (void)viewDidLoad {
    [super viewDidLoad];

    self.title = @"Root View";
}

SecondViewController.h：

#import <UIKit/UIKit.h>

@class ThirdViewController;

@interface SecondViewController : UIViewController {
    ThirdViewController *thirdViewController;
}

@property (nonatomic, retain) ThirdViewController *thirdViewController;

- (IBAction)pushThirdVC;

@end

SecondViewController.m：

#import "SecondViewController.h"
#import "ThirdViewController.h"

@implementation SecondViewController

@synthesize thirdViewController;

- (IBAction)pushThirdVC {
    if(self.thirdViewController == nil)
    {
        ThirdViewController *thirdVC = [[ThirdViewController alloc] initWithNibName:nil bundle:[NSBundle mainBundle]];
        self.thirdViewController = thirdVC;
        [thirdVC release];
    }
    [self.navigationController pushViewController:self.thirdViewController animated:YES];
}

- (void)viewDidLoad {
    [super viewDidLoad];

    self.title = @"2nd View";
}

第三视图控制器.h：

#import <UIKit/UIKit.h>

@interface ThirdViewController : UIViewController {
}

- (IBAction)popToRoot;

@end

ThirdViewController.m：

#import "ThirdViewController.h"

@implementation ThirdViewController

- (IBAction)popToRoot {
    [self.navigationController popToRootViewControllerAnimated:YES];
}

- (void)viewDidLoad {
    [super viewDidLoad];

    self.title = @"3rd View";
}