Ios 在表视图中实现搜索栏

此函数给出编译时错误

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

    return YES;
}

此行出现编译器错误

[self filterContentForSearchText:searchString 
                           scope:[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];

弧语义问题

“ViewController”没有可见的@interface声明选择器 'filterContentForSearchText:作用域：'

如何删除此错误？ 我遵循这个教程。教程中的确切函数是在xcode中给出错误

实现这一点

 - (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
    {
        NSPredicate *resultPredicate = [NSPredicate 
                                        predicateWithFormat:@"SELF contains[cd] %@",
                                        searchText];

        searchResults = [yourArray filteredArrayUsingPredicate:resultPredicate];
}

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我已经实现了它。有问题的函数编码中的编译时错误。请参阅我正在遵循本教程。教程中的函数searchDisplayController在xcode中给出错误。问题发生的确切位置是哪一行…[self filterContentForSearchText:searchString作用域：[[self.searchDisplayController.searchBar ScopeButtonTiles]对象索引：[self.searchDisplayController.searchBar selectedScopeButtonIndex]]；