Question

我正在使用Apple的示例代码示例：

http://developer.apple.com/iPhone/library/samplecode/TableSearch/index.html

在此示例中，UITableView在启动时获取内容列表。单击UISearchBar并键入，将过滤内容列表，同时检查ScopeBar的范围。

我必须将这种“即时搜索”重建为“普通搜索”：一开始我没有TableView的数据。用户应点击SearchBar，输入内容，按“搜索”按钮，搜索请求将发送到网络服务器。 Web服务器的响应将放入TableView，用户可以切换范围以过滤结果集。更改SearchBar的值不会过滤结果列表。只需按“搜索”即可启动搜索请求。

我拿了示例代码并重建它（源代码在底部）。但我有两个问题。

在SearchViewController的初始调用（使用TabBar，SearchBar，ScopeBar，TableView）时，一切正常。这是一个空的TableView。但是，点击SearchBar并键入一个字符，就会显示“没有命中”的消息。我怎么能避免这种情况？只有当用户按“搜索”并且确实没有匹配时，才会显示此消息。
我的第二个问题：键入“hello”并按“搜索”TableView不会列出结果。如果单击“中止”或在其他范围内，将列出结果。所以必须有一个像缺少“重装”的东西？！

我希望有人可以帮助我。非常感谢adavence＆amp;最诚挚的问候。

我的源代码：

@implementation SearchViewController

@synthesize listContent, filteredListContent, savedSearchTerm, savedScopeButtonIndex, searchWasActive;

- (void)viewDidLoad {
    // restore search settings if they were saved in didReceiveMemoryWarning.
    if (self.savedSearchTerm) {
        [self.searchDisplayController setActive:self.searchWasActive];
        [self.searchDisplayController.searchBar setSelectedScopeButtonIndex:self.savedScopeButtonIndex];
        [self.searchDisplayController.searchBar setText:savedSearchTerm];
        self.savedSearchTerm = nil;
    }
}

- (void)viewDidUnload {
    // Save the state of the search UI so that it can be restored if the view is re-created.
    self.searchWasActive = [self.searchDisplayController isActive];
    self.savedSearchTerm = [self.searchDisplayController.searchBar text];
    self.savedScopeButtonIndex = [self.searchDisplayController.searchBar selectedScopeButtonIndex];
    self.filteredListContent = nil;
}

- (void)dealloc {
    [listContent release];
    [filteredListContent release];
    [super dealloc];
}

- (void)setData {
    self.listContent = [NSMutableArray arrayWithCapacity:3];
    [self.listContent addObject:[SearchObjects itemWithType:@"AAA" name:@"Test1"]];
    [self.listContent addObject:[SearchObjects itemWithType:@"BBB" name:@"Test2"]];
    [self.listContent addObject:[SearchObjects itemWithType:@"BBB" name:@"Test3"]];

    // create a filtered list
    self.filteredListContent = [NSMutableArray arrayWithCapacity:[self.listContent count]];
    [self.tableView reloadData];
    self.tableView.scrollEnabled = YES;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    //If the requesting table view is the search display controller's table view, return the count of the filtered list, otherwise return the count of the main list.
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        return [self.filteredListContent count];
    } else {
        return [self.listContent count];
    }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *kCellID = @"cellID";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellID];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kCellID] autorelease];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }

    /* If the requesting table view is the search display controller's table view, configure the cell using the filtered content, otherwise use the main list. */
    SearchObjects *searchObject = nil;
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        searchObject = [self.filteredListContent objectAtIndex:indexPath.row];
    } else {
        searchObject = [self.listContent objectAtIndex:indexPath.row];
    }
    cell.textLabel.text = searchObject.name;
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    // HERE IS THE SOURCE CODE FOR PUSHING TO THE NEXT VIEW
}

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
    // DO SOME CALCULATIONS… AND THE setData METHOD IS CALLED
}

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope {
    /* Update the filtered array based on the search text and scope. */
    [self.filteredListContent removeAllObjects]; // First clear the filtered array.

    /* Search the main list for whose type matches the scope (if selected) and whose name matches searchText; add items that match to the filtered array. */
    for (SearchObjects *searchObject in listContent) {
        if ([scope isEqualToString:@"All"] || [searchObject.type isEqualToString:scope]) {
        NSComparisonResult result = [searchObject.name compare:searchText options:(NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch) range:NSMakeRange(0, [searchText length])];
            if (result == NSOrderedSame) {
                [self.filteredListContent addObject:searchObject];
            }
        }
    }
}

- (void)filterContentForScope:(NSString*)scope {
    /* Update the filtered array based on the search text and scope. */
    [self.filteredListContent removeAllObjects]; // First clear the filtered array.

    /* Search the main list for whose type matches the scope (if selected); add items that match to the filtered array. */
    for (SearchObjects *searchObject in listContent) {
        if ([scope isEqualToString:@"All"] || [searchObject.type isEqualToString:scope]) {
            [self.filteredListContent addObject:searchObject];
        }
    }
}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
    [self filterContentForScope:[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];    
    // Return YES to cause the search result table view to be reloaded.
    return YES;
}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption {
    [self filterContentForScope:[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:searchOption]];
    // Return YES to cause the search result table view to be reloaded.
    return YES;
}
@end

Answer 1

对于您的第一个问题，您应该为搜索栏设置一个代理，然后实施– searchBarSearchButtonClicked:并将搜索代码放在那里。您可能还必须实施– searchBarTextDidEndEditing:或– searchBar:textDidChange:等其他人，并确保他们不执行搜索。

对于第二个问题，您可能只想从– searchBarSearchButtonClicked:再次使用委托重新加载tableView，以确保在您搜索完成后再发生。您可以使用[tableView reloadData]来完成此任务。

Answer 2

问题已解决，请参阅评论。

iPhone - UITableView的问题 - 重新加载数据＆amp;没有命中

2 个答案: