UINavigationController后退按钮问题

发布于 2024-09-04 08:22:12 字数 788 浏览 3 评论 0原文

你好，

我有一个混合 iPhone 应用程序，有一个 UITabBarController 和 5 个选项卡。每个选项卡都托管一个 UINavigationViewController，该 UINavigationViewController 是用根控制器初始化的，该根控制器是托管一个 UIWebView 的 UIViewController。在某个特定链接上，我推送导航控制器固有的 UITableViewController （显示本地存储的一些数据）并具有后退按钮。以下是我在 shouldStartLoadWithRequest: 方法中解析 URL 字符串后的代码。

    UINavigationController *navControl = (UINavigationController *)self.parentViewController;
    CartTableViewController *tabView = [[CartTableViewController alloc] init];
    [navControl pushViewController:tabView animated:YES];
    navControl.navigationBar.hidden = NO;
    return YES;

这很好用。解析特定链接并将表视图推送到navigationStack上。当我单击后退按钮时（是的，它显示“后退”而不是上一个视图的名称，即“新闻”），我会得到另一个表视图，但这次后退按钮被命名为“新闻”。当我点击它时，我回到我的根控制器。我似乎没有找到两个视图从哪里通过根视图推送到堆栈上。

谢谢。扎基

原文

HEllo,

I have a hybrid iPhone application that has a UITabBarController and 5 Tabs. Each tab hosts a UINavigationViewController initialized with a root controller that is a UIViewController hosting one UIWebView. On a certain specific link, I push a UITableViewController inherent on the navigation Controller (which shows some data stored locally) and has a back button. Following is the code after i parse the URL string in shouldStartLoadWithRequest: method.

    UINavigationController *navControl = (UINavigationController *)self.parentViewController;
    CartTableViewController *tabView = [[CartTableViewController alloc] init];
    [navControl pushViewController:tabView animated:YES];
    navControl.navigationBar.hidden = NO;
    return YES;

This works fine. The specific link is parsed and the table view is pushed onto the navigationStack. When i click the back button though (and yes it shows 'back' rather than previous view's name which is, say 'news') i get another table view but this time the back button is named 'news'. and when i click on that, i go back to my rootcontroller. I don't seem to find from where are two views pushed onto the stack over root view.

Thanks.
Zaki

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粉红×色少女 2024-09-11 08:22:12

您的 webView:shouldStartLoadWithRequest:navigationType 实现可能被调用两次。一种解决方案是仅在 UINavigationController 堆栈上尚未存在实例时创建并推送 CartTableViewController 的实例。

if (![navControl.topViewController isKindOfClass:[CartTableViewController class]]) {
    CartTableViewController *tabView = [[[CartTableViewController alloc] init] autorelease];
    [navControl pushViewController:tabView animated:YES];
    navControl.navigationBar.hidden = NO;
}

您还应该释放您的 tabView 实例。

Your implementation of webView:shouldStartLoadWithRequest:navigationType is probably being called twice. One solution would be to only create and push an instance of CartTableViewController if an instance isn't already on the UINavigationController stack.

if (![navControl.topViewController isKindOfClass:[CartTableViewController class]]) {
    CartTableViewController *tabView = [[[CartTableViewController alloc] init] autorelease];
    [navControl pushViewController:tabView animated:YES];
    navControl.navigationBar.hidden = NO;
}

You should also be releasing your tabView instance too.

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