UISearchController結果沒有被過濾

Question

所以我在我的項目中使用UISearchController，它似乎工作一切正常，但無論我在搜索欄上輸入什麼，我不會得到任何結果。所以我相信問題出在我的 （void）updateSearchResultsForSearchController：（UISearchController *）searchController { }。說實話，我真的不知道該用哪種方法編碼。這裏是代碼的其餘部分：

@property (nonatomic, strong) UISearchController *searchController; 
@property (nonatomic, strong) SearchResultsTableViewController *resultsTableController; 
@property (nonatomic, strong) NSMutableArray *searchResults; // Filtered search results 
// for state restoration 
@property BOOL searchControllerWasActive; 
@property BOOL searchControllerSearchFieldWasFirstResponder; 

_resultsTableController = [[SearchResultsTableViewController alloc] init]; 
_searchController = [[UISearchController alloc] initWithSearchResultsController:self.resultsTableController]; 
self.searchController.searchResultsUpdater = self; 
[self.searchController.searchBar sizeToFit]; 
self.tableView.tableHeaderView = self.searchController.searchBar; 

self.searchController.delegate = self; 
self.searchController.dimsBackgroundDuringPresentation = NO; 
self.searchController.searchBar.delegate = self; 
self.searchController.searchBar.tintColor = [UIColor darkGrayColor]; 
self.definesPresentationContext = YES; 

- (void)viewDidAppear:(BOOL)animated { 
[super viewDidAppear:animated]; 

// restore the searchController's active state 
if (self.searchControllerWasActive) { 
    self.searchController.active = self.searchControllerWasActive; 
    _searchControllerWasActive = NO; 

    if (self.searchControllerSearchFieldWasFirstResponder) { 
     [self.searchController.searchBar becomeFirstResponder]; 
     _searchControllerSearchFieldWasFirstResponder = NO; 
    } 
}} 

#pragma mark - UISearchBarDelegate 
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar { 
[searchBar resignFirstResponder];} 


#pragma mark - UISearchResultsUpdating 

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController { 
} 

Answer 1

你需要把你的表視圖數據來自NSArray中，篩選它按你的搜索條件，然後重新加載表視圖。你的代碼可能看起來像這樣：

- (void) doSearch:(NSString *)searchText { 
    [self.filteredClients removeAllObjects]; 

    if ([searchText length] == 0) { 
     [self.filteredClients addObjectsFromArray:self.users]; 
    } else { 
     for (User *user in self.users) { 
      NSString *name = [user fullName]; 
      NSRange range = [[name lowercaseString] rangeOfString:[searchText lowercaseString]]; 
      if (range.location != NSNotFound) 
       [self.filteredClients addObject:user]; 
     } 
    } 
    [self.tableView reloadData]; 
} 


- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText { 
    if ([searchText length] > 0) 
    { 
     [self showCancelButton:YES]; 
    } 
    else { 
     [self showCancelButton:NO]; 
     [searchBar resignFirstResponder]; 
    } 
    [self doSearch:searchText]; 
} 


- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar 
{ 
    [self showCancelButton:YES]; 
} 

- (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar 
{ 
    if ([searchBar.text length] > 0) [self showCancelButton:YES]; 
    else        [self showCancelButton:NO]; 
    [self doSearch:_searchBar.text]; 
}