Question

您好，我正在尝试使用UISearchBar筛选用户的搜索。.我的用户列表位于Firebase的RealTimeDatabase中。

我在tableviewcontroller中向用户显示的方式是：

进行查询以获取数据
我创建了自己的 NSObject类（称为“用户” ）用于数据管理，并在表视图控制器中显示。.

现在我的问题是，如果用户使用UISearchBar，我不知道如何实现过滤数据的功能，你们中的任何一个可以帮助我解决此问题吗？

在下部，我向您展示了从数据库中查询数据以及实现搜索栏过滤器的方式..当然，我过滤数据的方式是错误的，我无法弄清楚哪里出了问题..我尝试了很多方法，但我无法解决...

@interface UserSearchViewController ()  <UISearchBarDelegate, UITableViewDelegate, UITableViewDataSource>
@property (nonatomic, strong) NSMutableArray *users;
@property (nonatomic, strong) NSMutableArray *filteredUsers;
@property (nonatomic, assign) BOOL isFiltered;
@property (nonatomic, strong) UserHandler *user;

- (void)viewDidLoad {
    [super viewDidLoad];

    /// Prepariamo la MutableArray che contiene i dati degli user
    _users = NSMutableArray.new;
    _searchBar.delegate = self;

    [self setupTableView];
    [self retrieveAllUser];
}

#pragma mark - Search Bar Filter Data

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
    [self filteredContent:searchText];
    [self.tableView reloadData];
}

-(void)filteredContent:(NSString *)searchText {
    if (searchText.length == 0) _isFiltered = NO;

    else {
        _isFiltered = YES;
        _filteredUsers = NSMutableArray.new;

        for (NSString *str in self.users) {

            NSRange range = [self.user.name rangeOfString:searchText options:NSCaseInsensitiveSearch];

            if (range.location != NSNotFound) [self.filteredUsers addObject:str];
        }
    }
}

#pragma mark - User Query

-(void)retrieveAllUser {
    /// Creiamo una referenza al Database di Firebase
    FIRDatabaseReference *dbRef = FIRDatabase.database.reference;

    /// Effettuiamo la query
    [[[dbRef child:kUserAccFolder] queryOrderedByChild:kUserAccEmail] observeEventType:FIRDataEventTypeChildAdded withBlock:^(FIRDataSnapshot *snapshot) {

        NSDictionary *dict = snapshot.value;

        if (dict) {

            self.user = UserHandler.new;

            self.user.name = dict[kUserAccName];
            self.user.university = dict [kUserAccUniversity];
            self.user.photoProfileURL = dict [kUserAccUrlImage];
            self.user.userID = snapshot.key;

            [self.users addObject:self.user];
        }

        [self.tableView reloadData];
    }];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (_isFiltered) return self.filteredUsers.count;
    return self.users.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UserSearchCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cellID" forIndexPath:indexPath];

    self.user = _isFiltered ? self.filteredUsers[indexPath.row] : self.users[indexPath.row];
    cell.name.text = self.user.name;

    return cell;
}

UISearchBar从Firebase查询中过滤数据

0 个答案: