UISearchController禁用取消UIBarButtonItem [英] UISearchController disable cancel UIBarButtonItem

问题描述

我正在尝试使用UISearchController在地图视图中搜索目的地。我希望UISearchBar出现在导航栏中，但如果没有在右侧显示取消按钮，我似乎无法这样做：

I am trying to use UISearchController to search for a destination on a map view. I want the UISearchBar to appear in the navigation bar, but I can't seem to make it do so without it showing a cancel button to the right of it:

< img src =https://i.stack.imgur.com/wBObM.pngalt =在此处输入图像说明>

此取消按钮已消失时间，虽然我正在玩耍，但我现在不能让它出现我的搜索表显示我想要它：

This Cancel button has disappeared at times, whilst I'm playing around, but I can't get it to not appear now I have got the search table showing how I want it to:

我确信必须有我做的东西有点小错误，但我无法理解它是什么......

I'm sure there must be something small I'm doing ever so slightly wrong, but I can't work out what it is...

self.resultsViewController = [UITableViewController new];
self.searchController = [[UISearchController alloc] initWithSearchResultsController:self.resultsViewController];
self.searchController.searchResultsUpdater = self;
self.searchController.hidesNavigationBarDuringPresentation = false;
self.searchController.delegate = self;
self.searchBar = self.searchController.searchBar;
self.searchBar.placeholder = self.stage.title;
self.searchBar.searchBarStyle = UISearchBarStyleMinimal;

self.definesPresentationContext = true;
self.navigationItem.titleView = self.searchBar;

self.resultsTableView = self.resultsViewController.tableView;
self.resultsTableView.dataSource = self;
self.resultsTableView.delegate = self;

推荐答案

根据评论更新

UISearchBar 有一个属性（参见 Apple docs ）确定是否显示取消按钮：

UISearchBar has a property (see the Apple docs) which determines whether the cancel button is displayed:

self.searchBar.showsCancelButton = false;

但是，根据OP评论，这不起作用，因为searchController不断切换取消按钮上。要避免这种情况，请创建UISearchBar的子类，并覆盖 setShowsCancelButton 方法：

But, as per OP comments, this does not work, because the searchController keeps switching the cancel button back on. To avoid this, create a subclass of UISearchBar, and override the setShowsCancelButton methods:

@implementation MySearchBar

-(void)setShowsCancelButton:(BOOL)showsCancelButton {
    // Do nothing...
}

-(void)setShowsCancelButton:(BOOL)showsCancelButton animated:(BOOL)animated {
    // Do nothing....
}

@end

为确保searchController使用此子类，我们还需要子类 UISearchController ，并覆盖 searchBar 方法以返回子类的实例。我们还需要确保新的searchBar激活searchController - 我选择使用 UISearchBarDelegate 方法 textDidChange 这个：

To ensure this subclass is used by the searchController, we also need to subclass UISearchController, and override the searchBar method to return an instance of our subclass. We also need to ensure that the new searchBar activates the searchController - I've chosen to use the UISearchBarDelegate method textDidChange for this:

@interface MySearchController ()  <UISearchBarDelegate> {
UISearchBar *_searchBar;
}
@end

@implementation MySearchController

-(UISearchBar *)searchBar {
    if (_searchBar == nil) {
        _searchBar = [[MySearchBar alloc] initWithFrame:CGRectZero];
        _searchBar.delegate = self;
    }
    return _searchBar;
}

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
    if ([searchBar.text length] > 0) {
        self.active = true;
    } else {
        self.active = false;
    }
}
@end

最后，更改代码实例化这个子类：

Finally, change your code to instantiate this subclass:

self.searchController = [[MySearchController alloc] initWithSearchResultsController:self.resultsViewController];

（您显然需要导入这些子类的相关头文件）。

(You will obviously need to import the relevant header files for these subclasses).

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