UINavigationController 与 popToRootViewController 的问题

发布于 2024-12-08 21:02:09 字数 1044 浏览 0 评论 0原文

假设我在视图控制器 C 中，我想转换到视图控制器 D（这里是 voteView）。这就是我所做的：

VoteViewController * voteView = [[VoteViewController alloc] init];
        voteView.voteInfo = [array objectAtIndex:0];

    NSArray * viewControllers = [self.navigationController viewControllers];
    if ([[viewControllers objectAtIndex:0] isKindOfClass:[ListViewController class]]){
        NSLog(@"LIST VIEW");
    } else if ([[viewControllers objectAtIndex:0] isKindOfClass:[SpotListingViewController class]]){
        NSLog(@"SPOT LISTING");
    }

    [self.navigationController setViewControllers:[NSArray arrayWithObjects:[viewControllers objectAtIndex:0], [viewControllers objectAtIndex:1], voteView, nil]];
    [voteView release];

运行上面的代码，它会打印 LIST VIEW，这意味着 RootViewController 是一个 ListViewController。现在理论上在 VoteViewController 中，当我执行以下操作时：

 if ([[viewControllers objectAtIndex:0] isKindOfClass:[ListViewController class]]){
            NSLog(@"LIST VIEW");

它应该打印列表视图，但事实并非如此。这是为什么呢？我还检查了视图控制器的计数，它只有 2。为什么不一样？

原文

So lets say that I am in viewcontroller, C and I want to transition to viewcontroller D (which is voteView here). So here's what I did:

VoteViewController * voteView = [[VoteViewController alloc] init];
        voteView.voteInfo = [array objectAtIndex:0];

    NSArray * viewControllers = [self.navigationController viewControllers];
    if ([[viewControllers objectAtIndex:0] isKindOfClass:[ListViewController class]]){
        NSLog(@"LIST VIEW");
    } else if ([[viewControllers objectAtIndex:0] isKindOfClass:[SpotListingViewController class]]){
        NSLog(@"SPOT LISTING");
    }

    [self.navigationController setViewControllers:[NSArray arrayWithObjects:[viewControllers objectAtIndex:0], [viewControllers objectAtIndex:1], voteView, nil]];
    [voteView release];

Running the code above, it prints LIST VIEW, which means that the RootViewController is a ListViewController. Now theoritically at VoteViewController when I do as below:

 if ([[viewControllers objectAtIndex:0] isKindOfClass:[ListViewController class]]){
            NSLog(@"LIST VIEW");

it should print LIST VIEW, however it doesn't. Why is this? I also checked the count of the view controller and it's only 2. Why is it different?

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

独夜无伴 2024-12-15 21:02:09

如果您的要求是转换到视图控制器 D（或 voteView），

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

那么当您调用 setViewControllers: 并访问索引 1 处的对象时，您应该执行与您的问题相关的操作，你确保数组有两个对象吗？您将 NSLog 放入了 voteView 的哪个方法中？

If your ask is to transition to View Controller D (or voteView), you should be doing-

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

Related to your question, when you call setViewControllers: and access object at index 1, have you ensured that the array has two objects? In which method of voteView did you put the NSLog?

回复收藏 0 原文

~没有更多了~