ios - 在具有多个部分的 UITableView 中从 UISearchBar 按类型搜索？

Question

所以我目前正在收听来自 searchBar 的文本更改:

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

我想设计一个方法 filterContentForsearchText 以便它在我键入时自动过滤我的 UITableView。

我遇到的问题是我的 UITableView 很复杂。它有多个部分和多个字段。它基本上是一个联系人/地址簿，是一个包含联系人对象的数组。

CustomContact *con = [contacts[section_of_contact] allValues][0][x] 其中 x 是该部分中的特定行返回具有 con 等属性的 CustomContact“con” .fullName.

UITableView 目前在单独的部分中显示联系人的全名。我如何在使用 UISearchBar 键入时过滤数组/UITableView 的这种结构？

表格的填充方式如下:

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

    BrowseContactCell *cell = [tableView dequeueReusableCellWithIdentifier:@"BROWSECELL"];

    CustomContact *thisContact = [self.contacts[indexPath.section] allValues][0][indexPath.row];

        cell.labelName.text = thisContact.fullName;

return cell;
}

Answer 1

我还创建了一个包含部分(数组的数组)的地址簿，所以我只发布我的解决方案，但这不是我自己的解决方案(我前段时间在 stackoverflow 的某个地方找到它):

在您的 UITableViewController 子类中，只需添加以下两个 UISearchDisplayDelegate 方法 ( link to the api reference ) 和“自定义”方法 filterContentForSearchText 进行过滤你的阵列。为了更好地理解，请阅读我在代码块中的评论。欢迎提出更多问题或提出改进意见。

#pragma mark - search Display Controller Delegate

- (BOOL) searchDisplayController : (UISearchDisplayController *) controller
shouldReloadTableForSearchString : (NSString *) searchString {

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

#pragma mark - Search Filter

- (void) filterContentForSearchText : (NSString*) searchText
                              scope : (NSString*) scope {
    // Here, instead of "lastName" or "firstName" just type your "fullName" a.s.o.
    // I have also a custom NSObject subclass like your CustomContact that holds 
    //these strings like con.firstName or con.lastName
    NSPredicate* resultPredicate = [NSPredicate predicateWithFormat : @" (lastName beginswith %@) OR (firstName beginsWith %@)", searchText, searchText];

    // For this method, you just don't need to take your partitioned and 
    // somehow complicated contacts array (the array of arrays). 
    // Instead, just take an array that holds all your CustomContacts (unsorted):
    NSArray* contactsArray = // here, get your unsorted contacts array from your data base or somewhere else you have stored your contacts;

    // _searchResults is a private NSArray property, declared in this .m-file 
    // you will need this later (see below) in two of your UITableViewDataSource-methods:
    _searchResults = [contactsArray filteredArrayUsingPredicate : resultPredicate];

    // this is just for testing, if your search-Filter is working properly.
    // Just remove it if you don't need it anymore
    if (_searchResults.count == 0) {
        NSLog(@" -> No Results (If that is wrong: try using simulator keyboard for testing!)");
    } else {
        NSLog(@" -> Number of search Results: %d", searchResults.count);
    }
}

现在，您需要对以下三个 UITableViewDataSource 方法进行一些更改:

注意:searchResultsTableView也加载了普通的公共(public)数据源通常调用的方法来填充您的(分段地址簿)tableView:

1.

- (NSInteger) numberOfSectionsInTableView : (UITableView *) tableView
{
    if (tableView == self.searchDisplayController.searchResultsTableView) {
         // in our searchTableView we don't need to show the sections with headers
        return 1;
    }
    else {
        return [[[UILocalizedIndexedCollation currentCollation] sectionTitles] count];
    }
}

2.

- (NSInteger) tableView : (UITableView *) tableView
  numberOfRowsInSection : (NSInteger) section {

    if (tableView == self.searchDisplayController.searchResultsTableView) {
        // return number of search results
        return [_searchResults count];
    } else {
        // return count of the array that belongs to that section
        // here, put (or just let it there like before) your 
        // [contacts[section] allValues][count]
       return [[currentMNFaces objectAtIndex : section] count];
    }    
}

3.

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

    BrowseContactCell *cell = [tableView dequeueReusableCellWithIdentifier:@"BROWSECELL"];
CustomContact *thisContact = nil;

    // after loading your (custom) UITableViewCell
    // you probably might load your object that will be put into the 
    // labels of that tableCell.
    // This is the point, where you need to take care if this is your
    // address-book tableView that is loaded, or your searchTable:

    // load object...    
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        // from search list
        faceAtIndex = [self->searchResults objectAtIndex: indexPath.row];
    } else {
        // from your contacts list
        contactAtIndex = [self.contacts[indexPath.section] allValues][0][indexPath.row];
    }

    }

希望对你有用。