Question

我有一个UITableView，顶部有一个搜索栏。我使用UISearchDisplayController来实现相同的功能。它还有一个带两个按钮的示波器栏。默认情况下，当我启动应用程序时，将显示范围栏。当我在搜索后单击取消按钮时，示波器条消失了。因此，即使在我按下“取消”按钮后，还有任何方法可以保留范围栏。我使用了以下代码，但它不起作用。

- (BOOL)searchBarShouldEndEditing:(UISearchBar *)searchBar
{
    [searchBar setShowsScopeBar:YES];
    return YES;
}

谢谢：）

Answer 1

我今天遇到了问题，我想我找到了解决方案。

你需要做两件事：

设置showsScopeBar后，在searchBar上调用'sizeToFit'。这将确保正确设置searchBars框架以包括范围栏。
不幸的是，当searchBar调整大小并导致范围栏与第一个单元重叠时，表视图似乎不喜欢它。要解决此问题，您可以将tableHeaderView重新设置为searchBar（再次），这似乎可以解决重叠问题。

最终代码：

- (BOOL)searchBarShouldEndEditing:(UISearchBar *)searchBar
{
    self.searchBar.showsScopeBar = YES;
    [self.searchBar sizeToFit];
    self.tableView.tableHeaderView = self.searchBar;
    return YES;
}

Answer 2

我自己过去几天也一直在与这些UISearchBarController问题作斗争，我不得不说用UISearchBar做任何不寻常的事情的最好方法是不要使用UISearchDisplayController来所有！

只需使用UISearchBar和UISearchBarDelegate方法并自行滚动，然后就可以将所有内容设置为完全符合您的需求。

这是我最近在一个项目中所做的。 - 示波器栏始终可见 - 我在输入文字时立即过滤 - 如果范围发生变化，我会立即过滤 - 我不需要时隐藏取消按钮 - 我不需要时隐藏键盘

// Filters the table when requested
- (void)filterContentForSearchBar:(UISearchBar *)searchBar
{
    NSString *scope = [[searchBar scopeButtonTitles] objectAtIndex:[searchBar selectedScopeButtonIndex]];
    NSString *search = [searchBar text];

    NSMutableArray *predicates = [[NSMutableArray alloc] init];

    if ([scope isEqualToString:@"Selected"])
    {
        [predicates addObject:[NSPredicate predicateWithFormat:@"selected == 1"]];
    }

    if (search && search.length) {
        [predicates addObject:[NSPredicate predicateWithFormat:@"name contains[cd] %@", search]];
    }

    NSPredicate *predicate = [NSCompoundPredicate andPredicateWithSubpredicates:predicates];

    self.filteredObjectList = [self.objectList filteredArrayUsingPredicate:predicate];

    [self.myTableView reloadData];
}


#pragma mark - UISearchBarDelegate Methods

// React to any delegate method we are interested in and change whatever needs changing
- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar
{
    searchBar.showsCancelButton = true;
}

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar
{
    searchBar.showsCancelButton = false;
    [searchBar resignFirstResponder];

    searchBar.text = nil;
    [self filterContentForSearchBar:searchBar];
}

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar
{
    searchBar.showsCancelButton = false;
    [searchBar resignFirstResponder];
}

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
    [self filterContentForSearchBar:searchBar];
}

- (void)searchBar:(UISearchBar *)searchBar selectedScopeButtonIndexDidChange:(NSInteger)selectedScope
{
    [self filterContentForSearchBar:searchBar];
}

效果很好：）

Answer 3

这个answer更正确的方法是为返回结果添加逻辑：

@property (nonatomic) BOOL shouldHideFirstResponder; //assign YES in init

- (BOOL)searchBarShouldEndEditing:(UISearchBar *)searchBar {
    if (self.shouldHideFirstResponder) {
        self.searchBar.showsScopeBar = YES;
        [self.searchBar sizeToFit];
        self.table.tableHeaderView = self.searchBar;
    }

    return self.shouldHideFirstResponder;
}

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
    self.shouldHideFirstResponder = NO;
}

- (void)searchBarCancelButtonClicked:(UISearchBar *) searchBar {
    self.shouldHideFirstResponder = YES;
}

- (void)searchDisplayControllerWillEndSearch:(UISearchDisplayController *)controller {
    if (!self.searchBar.text || self.searchBar.text.length < 1) {
        self.shouldHideFirstResponder = YES;
    }
}

按下取消按钮后如何保持范围栏？

3 个答案: