UISearchBar 和 UINavigationItem

发布于 2024-08-08 13:20:51 字数 697 浏览 3 评论 0原文

我似乎无法让 UISearchBar 将其自身定位在导航栏中从最左边到最右边。在 -(void)viewDidLoad 方法中，我有以下代码：

UISearchBar *sb = [[UISearchBar alloc] initWithFrame:self.tableView.tableHeaderView.frame];
sb.delegate = self;
self.navigationItem.titleView = sb;
[sb sizeToFit];
[sb release];

当您构建并运行时，乍一看它看起来很好。然而，仔细观察，您可以看出左侧有一个边距/空间。从总体上看，这不是什么大问题，但当我点击搜索栏开始搜索时，我将取消按钮设置为视图动画。由于搜索栏位置稍微靠右，因此动画很不稳定，并且取消按钮从末端脱落，如下所示：链接文本

UINavigationItem 看起来就像一个包含三个单元格的表格，第一个和最后一个上有一个填充，我无法删除 - 似乎也没有办法将它们“合并”在一起，然后将搜索栏放在那里。我知道这种外观是可能的，因为 AppStore 搜索在导航栏中有一个搜索栏，并且它一直延伸到边缘。有人知道如何让搜索栏一直到边缘，以便我的滑入式取消按钮动画能够正常工作吗？

原文

I can't seem to get a UISearchBar to position itself from the far left to the far right in the navigation bar. In the -(void)viewDidLoad method, I have the following code:

UISearchBar *sb = [[UISearchBar alloc] initWithFrame:self.tableView.tableHeaderView.frame];
sb.delegate = self;
self.navigationItem.titleView = sb;
[sb sizeToFit];
[sb release];

When you build and run, it looks just fine at first glance. However, looking more closely, you can tell there is a margin/space on the left. This wouldn't be a big deal in the grand scheme of things, but when I tap the search bar to start a search, I animate the cancel button into view. Because the search bar is positioned slightly to the right, the animation is jerky and the cancel button falls off the end like so:
link text

It seems as if the UINavigationItem is like a table with three cells, where there is a padding on the first and last which I can't remove - nor does there seem to be a way to 'merge' it all together and then place the search bar there. I know this look is possible, because the AppStore search has a search bar in the navigation bar and it goes all the way to the edges. Anyone know how to get the search bar to go all the way to the edges so my slide-in cancel button animation will work properly?

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谜泪 2024-08-15 13:20:51

实际上，有一个非常简单的解决方案。您所要做的就是为后面的项目创建一个零宽度视图：

UIView *hackView = [[UIView alloc] initWithFrame:CGRectZero];
UIBarButtonItem *hackItem = [[UIBarButtonItem alloc] initWithCustomView:hackView];      
self.navigationItem.backBarButtonItem = hackItem;
[hackView release];
[hackItem release];

UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectZero];
[searchBar sizeToFit];
self.navigationItem.titleView = searchBar;
[searchBar release];

~~请务必在您的 loadView 方法中执行此操作，而不是 init。我不确定为什么这会产生影响，但确实如此。~~

显然，这是关于时机的。将它放在 loadView 中对我来说不再起作用，但是将它放在 viewWillAppear 中可以工作（当然，进行检查，以便只完成一次）。我认为这个想法是在一些初始化完成后设置 titleView 。

Actually, there's a really simple solution. All you have to do is create a zero-width view for the back item:

UIView *hackView = [[UIView alloc] initWithFrame:CGRectZero];
UIBarButtonItem *hackItem = [[UIBarButtonItem alloc] initWithCustomView:hackView];      
self.navigationItem.backBarButtonItem = hackItem;
[hackView release];
[hackItem release];

UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectZero];
[searchBar sizeToFit];
self.navigationItem.titleView = searchBar;
[searchBar release];

~~Be sure to do this in your loadView method, not init. I'm not sure why that makes a difference, but it does.~~

Apparently it's about timing. Having it in loadView stopped working for me, but putting it in viewWillAppear works (with a check so that it's only done once, of course). I think the idea is to set the titleView after some initialization has already completed.

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沉睡月亮 2024-08-15 13:20:51

以下代码仅针对此 UIViewController 隐藏导航栏：

- (void)viewWillAppear:(BOOL)animated
{
    [self.navigationController setNavigationBarHidden:YES animated:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [self.navigationController setNavigationBarHidden:NO animated:animated];
}

因此，要使 UISearchBar 显示在 UINavigationBar 的位置，在根视图控制器上只需将搜索栏放在导航栏通常所在的位置即可！

The following code hides the navigationBar just for this UIViewController:

- (void)viewWillAppear:(BOOL)animated
{
    [self.navigationController setNavigationBarHidden:YES animated:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [self.navigationController setNavigationBarHidden:NO animated:animated];
}

So to get the UISearchBar to show in the UINavigationBar's place, on your root view controller just have your search bar where the navigation bar would be normally!

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