Question

我设置了searchDisplayController和searchBar，如下所示：

UISearchBar *aSearchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 150, 44)];
self.reportSearchBar = aSearchBar;
_reportSearchBar.tintColor = DARKGRAY_COLOR;
_reportSearchBar.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;
_reportSearchBar.delegate = self;
[aSearchBar release];

UISearchDisplayController *searchDisplayCtlr = [[UISearchDisplayController alloc] initWithSearchBar:self.reportSearchBar contentsController:self];
self.reportSearchDisplayController = searchDisplayCtlr;
self.reportSearchDisplayController.searchResultsDataSource = self;
self.reportSearchDisplayController.searchResultsDelegate = self;
[searchDisplayCtlr release];

UIBarButtonItem *searchBBI = [[UIBarButtonItem alloc] initWithCustomView:_reportSearchBar];
self.reportSearchBBI = searchBBI;
[searchBBI release];

[self.navigationItem setRightBarButtonItem:_reportSearchBBI animated:NO];

我检查了我的ViewController是否符合该类以防万一：

if ([self conformsToProtocol:@protocol(UISearchDisplayDelegate)]) {
    NSLog(@"conform to search display");
}

我的ViewController .h文件有：

<UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate, UISearchDisplayDelegate>

但是，我在

处设置了一个断点

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
    [self filterContentForSearchText:searchString];

    return YES;
}

它永远不会到达那里。我实现了一个UISearBarDelegate方法，它确实得到了该方法。当我运行Apple的示例代码TableSearch时，上面复制的searchDisplayController委托方法会运行。所以对我来说，我尝试将文本放入搜索栏并且我的应用程序崩溃，因为过滤后的列表中没有对象，因为searchDisplayController委托永远不会被调用。

思考？谢谢！

Answer 1

我只是在苹果参考中看到：

searchController = [[UISearchDisplayController alloc]
                     initWithSearchBar:searchBar contentsController:self];
searchController.delegate = self;
searchController.searchResultsDataSource = self;
searchController.searchResultsDelegate = self;

我在你的代码中没有看到searchController.delegate = self，是不是那个nessesary？

http://developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/UISearchDisplayController_Class/Reference/Reference.html

Answer 2

确保在头文件中为UISearchDisplayController创建iVar。

如果使用以下方法创建UISearchDisplayController：

UISearchDisplayController* searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:searchField contentsController:self];

它将由ARC发布，它不会调用任何委托方法，当你调用self.searchDisplayController（UIViewController的属性）时，它将是nil。

所以，修复是：在标题（.h）文件中：

@interface MenuViewController : UIViewController <UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate, UISearchDisplayDelegate> {
        UISearchDisplayController* searchDisplayController;
        UISearchBar *searchField;
        UITableView* tableView;
        NSArray* searchResults;
}

并在实现（.m）文件中：

searchField = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 49)];
searchField.delegate = self;

searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:searchField contentsController:self];
searchDisplayController.delegate = self;
searchDisplayController.searchResultsDataSource = self;
searchDisplayController.searchResultsDelegate = self;

tableView.tableHeaderView = searchField;
tableView.contentOffset = CGPointMake(0, searchField.frame.size.height);

如果按此方式实施，您可以在其余代码中同时调用self.searchDisplayController和searchDisplayController。

什么时候调用searchDisplayController委托方法？

2 个答案: