UISearchDisplayController委托方法不叫

Question

我想添加一个UISearchBar到我在'nib'文件中定义的表视图。我添加了一个搜索栏和IB搜索显示控制器，链接的搜索栏的出口，并增加这视图控制器的“.H”文件：

@interface SearchListViewController : UIViewController <UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate, UISearchDisplayDelegate> 

而且，我已经实现了以下的委托方法：

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString 
{ 
    [self filterContentForSearchText:searchString scope: 
    [[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]]; 
    return YES; 
} 

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption 
{ 
    [self filterContentForSearchText:self.searchDisplayController.searchBar.text scope: 
    [[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:searchOption]]; 
    return YES; 
} 

我发现shouldReloadTableForSearchString:方法被调用，但却shouldReloadTableForSearchScope:方法不会被调用，所以我的表视图数据不与搜索结果重新加载，有什么能我会丢失？

在此先感谢

Answer 1

你必须委托设置为self。

searchController.delegate = self; 
searchController.searchResultsDataSource = self; 
searchController.searchResultsDelegate = self; 

UISearchDisplayController Class Reference