如何让UISearchBar范围栏始终可见？ [英] How to have UISearchBar scope bar always visible?

问题描述

这是我在iPhone SDK上遇到的最新问题。

Here's my latest problem with the iPhone SDK.

我有一个UISearchBar及其代表全部设置完毕。
另外，当我加载我的视图时，我调用

I've got a UISearchBar and its delegate all set up. Also, when I load my view, I call

self.searchDisplayController.searchBar.showsScopeBar = YES;

这样，当我的视图首次出现时，我会看到范围栏，如预期的那样。
但是如果触摸搜索栏内部然后在其外部（或者即使执行搜索然后取消它），范围栏也会再次隐藏。

That way, when my view is first presented, I see the scope bar, as expected. But if touch inside the search bar and then outside it (or even if a perform a search and then cancel it), the scope bar gets hidden again.

所以我的问题是：是否可以让范围栏始终可见？甚至在进行搜索后？

So my question is: is it possible to have the scope bar always visible? Even after performing searches?

非常感谢。

推荐答案

UISearchDisplayController正在为你隐藏范围栏。

The UISearchDisplayController is hiding the scope bar for you.

解决这个问题的方法是继承UISearchBar并覆盖setShowsScopeBar的实现：

The way around this is to subclass UISearchBar and override the implementation of setShowsScopeBar:

@interface MySearchBar : UISearchBar {

}

@end

@implementation MySearchBar

- (void) setShowsScopeBar:(BOOL) show
{
    [super setShowsScopeBar: YES]; // always show!
}

@end

然后，在Interface Builder中，将视图中的搜索栏（与UISearchDisplayController相关联）的类更改为新类类型 - 在此示例中为MySearchBar。

Then, in Interface Builder, change the class of the Search Bar you have in your view (that is associated with the UISearchDisplayController) to the new class type -- MySearchBar in this example.

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