Question

我对UISearchDisplayController有疑问。我使用UIViewController向Storyboard添加了一个UITableView。 UITableViewDataSource和UITableViewDelegate已连接到Storyboard中的myViewController。

我在myViewController中实现了以下delegates和datasources：

UISearchBarDelegate，UISearchDisplayDelegate，UITableViewDataSource，UITableViewDelegate。在表格视图中显示所有数据都可以正常工作，但是当我开始搜索时，numberOfRowsInSection：方法被调用但在此之后cellForRowAtIndexPath：未被调用，并且searchResultsTableView未显示一点都不有人能帮助我吗？

以下是UISearchDisplayDelegate和UISearchBarDelegate方法的代码。

编辑：

static NSString *ProductCellIdentifier = @"TKMProductTableCell";
@interface TKMSearchAllProductsTableVC () <UISearchBarDelegate, UISearchDisplayDelegate, UITableViewDataSource, UITableViewDelegate> {
    UISearchDisplayController *searchDisplayController;
}

@property (nonatomic, strong) NSArray *allProducts;
@property (nonatomic, strong) NSMutableArray *filteredProducts;
@property (nonatomic, strong) UISearchBar *searchBar;

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (tableView == searchDisplayController.searchResultsTableView) {
        return [_filteredProducts count];
    } else {
        return [_allProducts count];
    }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    TKMProductTableCell *cell = [self.tableView dequeueReusableCellWithIdentifier:ProductCellIdentifier];

    // Configure the cell...
    [self configureProductCell:cell atIndexPath:indexPath inTableView:tableView];

    return cell;
}

- (void)configureProductCell:(TKMProductTableCell *)cell atIndexPath:(NSIndexPath *)indexPath inTableView:(UITableView *)tableView
{
    TKMProduct *product = nil;
    if (tableView == searchDisplayController.searchResultsTableView) {
        product = self.filteredProducts[indexPath.row];
    } else {
        product = self.allProducts[indexPath.row];
    }

    cell.lblTitle.text = product.name;

}
#pragma mark - UISearchBarDelegate
- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar
{
    [self.navigationItem setRightBarButtonItem:nil];
    searchBar.showsCancelButton = YES;

    searchBar.autocorrectionType = UITextAutocorrectionTypeNo;

    [searchDisplayController setActive:YES animated:YES];
}

-(void)searchBarTextDidEndEditing:(UISearchBar *)searchBar
{
    searchBar.showsCancelButton = NO;
}

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar
{
    searchBar.showsCancelButton = NO;

    [searchBar resignFirstResponder];
    [searchDisplayController setActive:NO animated:YES];
    [self dismissViewControllerAnimated:YES completion:nil];
}

#pragma mark - UISearchDisplayDelegate

- (void)filterContentForSearchText:(NSString *)searchText
{
    [self.filteredProducts removeAllObjects];

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name contains[c] %@", searchText];
    _filteredProducts = [NSMutableArray arrayWithArray:[_allProducts filteredArrayUsingPredicate:predicate]];
}

- (void)searchDisplayController:(UISearchDisplayController *)controller didShowSearchResultsTableView:(UITableView *)tableView
{
    tableView.backgroundColor = [UIColor redColor];
}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
    {
    if (![searchString isEqualToString:@""] && searchString != nil) {
        [self filterContentForSearchText:searchString];
        [searchDisplayController.searchResultsTableView setHidden:NO];
    }

    return YES;
}

编辑2

这是我的UISearchDisplayController代码：

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

以下是故事板连接的简介：
screenshoot of storyboard connections

编辑3：

我刚在日志中发现UITableView's方法中的CGRectZero框架为numberOfRowsInSection：

(lldb) po [searchDisplayController searchResultsTableView]
<UISearchResultsTableView: 0x1368c4a00; frame = (0 0; 0 0); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0x1744420d0>; layer = <CALayer: 0x174821e20>; contentOffset: {0, 0}; contentSize: {0, 0}>

(lldb) po [self.searchDisplayController searchResultsTableView]
<UISearchResultsTableView: 0x1368c4a00; frame = (0 0; 0 0); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0x1744420d0>; layer = <CALayer: 0x174821e20>; contentOffset: {0, 0}; contentSize: {0, 0}>

(lldb) po self.tableView
<UITableView: 0x136878e00; frame = (0 0; 320 504); clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x17444dd70>; layer = <CALayer: 0x17422e300>; contentOffset: {0, 0}; contentSize: {320, 117906}>

(lldb) po tableView
<UISearchResultsTableView: 0x1368c4a00; frame = (0 0; 0 0); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0x1744420d0>; layer = <CALayer: 0x174821e20>; contentOffset: {0, 0}; contentSize: {0, 0}>

Answer 1

建议

我可能有点偏离主题，但你应该知道这一点。

请勿使用UISearchDisplayController因为它不再稳定。

Apple文档

重要提示：在iOS 8中不推荐使用UISearchDisplayController UISearchDisplayDelegate也被弃用了。）管理在iOS 8和iOS中显示搜索栏并显示搜索结果之后，改为使用UISearchController。

Link

Answer 2

您是否检查过numberOfRowsInSection返回的内容。在filterContentForSearchText方法执行shouldReloadTableForSearchString方法之后，还要检查_filteredProducts数组大小。将NSLog放在每个方法中并调试代码。

尝试使用此NSPredicate格式字符串：

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name like[cd] %@", searchText];

Answer 3

您是否已将班级或自定义单元格笔记注册到UISearchDisplayController表？

我使用UISearchDisplayController委托方法：

- (void)searchDisplayController:(UISearchDisplayController *)controller
  didLoadSearchResultsTableView:(UITableView *)tableView
{
    [tableView registerClass:[UITableViewCell class]
      forCellReuseIdentifier:CellIdentifier];
}

iOS UISearchDisplayController不显示结果

3 个答案:

建议