Question

我正在尝试使用代码推送新的视图控制器：

[self.navigationController pushViewController:webViewController animated:YES];

但它不起作用。在表视图中选择单元格时会发生此代码。我有一个表视图，我认为这是防止这种情况发生的。我试过以模态方式呈现它，但是摆脱了导航栏，我无法回头。这与此非常相似，但答案对我不起作用！

更新

- (void)loadView {
    // Create an instance of UIWebView as large as the screen
    CGRect screenFrame = [[UIScreen mainScreen] applicationFrame];
    UIWebView *wv = [[UIWebView alloc] initWithFrame:screenFrame];
    // Tell web view to scale web content to fit within bounds of webview 
    [wv setScalesPageToFit:YES];

    [self setView:wv];
    [wv release];
}

将Web视图作为WebViewController的视图

如上所示没有笔尖

使用NSLog查找didSelect单元格方法以查找

所有内容都已初始化并已分配且非零

更新：

我选择了细胞方法：

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    // Push the web view controller onto the navigaton stack - this implicity
    // creates the web view controller's view the first time through

    NSLog(@"TOUCHED!");

    webViewController = [[WebViewController alloc] init];

    if (webViewController == nil) {
        NSLog(@"webViewController in nil state");
    }

    [self.navigationController pushViewController:webViewController animated:YES];


    // Grab the selected item
    RSSItem *entry = [[channel items] objectAtIndex:[indexPath row]];

    // Construct a URL with the link string of the item
    NSURL *url = [NSURL URLWithString:[entry link]];

    // Construct a request object with that URL
    NSURLRequest *req = [NSURLRequest requestWithURL:url];

    // Load the request into the web view
    [[webViewController webView] loadRequest:req];

    // Set the title of the web view controller's navigation item
    [[webViewController navigationItem] setTitle:[entry title]];

}

在插入TAB BAR控制器之前所有这些工作

更新

我在哪里创建控制器（IN APP DELEGATE）：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

             self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    ListViewController *lvc = [[ListViewController alloc] initWithStyle:UITableViewStylePlain];

    [lvc autorelease];
    // Create the tabBarController
    UITabBarController *tabBarController = [[UITabBarController alloc] init];

    // Create two view controllers
    UIViewController *vc1 = [[ListViewController alloc] initWithStyle:UITableViewStyleGrouped];
    UIViewController *vc2 = [[YoutubeViewController alloc] init];

    // Make an array containing the two view controllers
    NSArray *viewControllers = [NSArray arrayWithObjects:vc1, vc2, nil];

    // The viewControllers array retains vc1 and vc2, we can release
    // our ownership of them in this method
    [vc1 release];
    [vc2 release];

    // Attach them to the tab bar controller
    [tabBarController setViewControllers:viewControllers];

    // Put the tabBarController's view on the window
    [[self window] setRootViewController:tabBarController];

    // The window retains tabBarController, we can release our reference
    [tabBarController release];

    // Show the window
    [[self window] makeKeyAndVisible];

    return YES;
}

所以我真的不知道这里发生了什么。如果您可以帮我解决另一个问题！转到我的个人资料，看看有关如何在uitableviewcell中停止截止/为文字标签添加额外行的问题

Answer 1

我没有在你的app委托中看到最初的UINavigationViewController。为了使用self.navigationController pushViewController，视图控制器需要位于self.navigationController.viewControllers中。您可以修改您的代码并尝试以下内容，看它是否适合您。

// Create two view controllers
UIViewController *vc1 = [[ListViewController alloc] initWithStyle:UITableViewStyleGrouped];
UIViewController *vc2 = [[YoutubeViewController alloc] init];

// Create the UINavigationController and put the list view controller as the root view controller
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:vc1];

// Make an array containing the two view controllers and the UINavigationController which has the ListViewController is the first one.
NSArray *viewControllers = [NSArray arrayWithObjects:navController, vc2, nil];

// The viewControllers array retains vc1 and vc2, we can release
// our ownership of them in this method
[vc1 release];
[vc2 release];
[navController release];

// Attach them to the tab bar controller
[tabBarController setViewControllers:viewControllers];

Answer 2

为了使推送成功，您必须检查几点。

首先，要推送的视图控制器可能是设计并存储在NIB文件中。检查如何在代码中创建它，尤其是NIB文件名（假设您使用-(id)initWithNibName:(NSString *)nibName bundle:(NSBundle *)nibBundle）。它必须是没有NIB / XIB扩展名的真实NIB文件名。

其次，触发的选择事件是否真的发送到表视图委托？您可以进行一些日志记录以确保这一点。表视图不会阻止视图控制器被推送到导航堆栈。

关于如何/在何处创建该控制器的问题并非如此精确，所以最后，如果这些都不起作用，请在推送之前进行测试以分配/初始化控制器。您可能对正在发生的事情有了更好的了解。

Answer 3

如果视图控制器位于“更多”按钮下，则情况会发生一些变化。

这对我有用，可以找出要使用的导航控制器：

- (void)application:(UIApplication *)app didReceiveLocalNotification:(UILocalNotification *)notif {
    UITabBarController *tabBar = (UITabBarController*) self.window.rootViewController;
    UINavigationController* navigationController = (UINavigationController*)self.tabBarController.selectedViewController;
    UIViewController* top = nil;
    if ([navigationController respondsToSelector:@selector(topViewController)]) {
        top = navigationController.topViewController;
    }

    // the actual current navigation controller depends on whether we are on a view under the More tab
    UINavigationController *curNavController;
    if (top == nil) {  // this implies a view under the More tab
        curNavController = tabBar.moreNavigationController;
    } else {
        curNavController = navigationController;
    }
    [[LocalNotificationMgr Get] ReceivedNotification:notif navController:curNavController];
}

基本上，如果用户位于“更多”选项卡下的视图中，则要用于将UIViewController推送到的实际当前UINavigationController是UITabBarController的moreNavigationController属性。如果在标签栏本身上实际可见的视图上，请使用UITabBarController的selectedViewController属性。注意：如果您使用“更多屏幕”本身，则可以使用任一属性。

Answer 4

你是否以下面这样的方式做到了？

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if(reqList==Nil)
    {
        reqList = [[RequestList alloc]initWithNibName:@"RequestList" bundle:nil];
    }

            [self.navigationController pushViewController:reqList animated:YES];
}

pushViewController不使用标签栏控制器

4 个答案: