Question

我从Firebase获取重复内容，而我似乎无法弄清楚我做错了什么。在firebase我有6个帖子。 tableview填充了6个单元格，但所有6个单元格都有相同的数据，其他5个帖子不在那里。

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

{
    RankingsCell *cell = [tableView dequeueReusableCellWithIdentifier:@"RankingsCell"];
    self.ref = [[FIRDatabase database] reference];
    posts = [ref child:@"posts"];

    [posts observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot)
     {
         for (snapshot in snapshot.children)
         {
             NSString *username = snapshot.value[@"Name"];
             NSString *date = snapshot.value[@"Date"];
             NSString *combatPower = snapshot.value[@"Combat Power"];
             NSString *pokemon = snapshot.value[@"Pokemon"];
             NSString *pokemonURL = snapshot.value[@"Pokemon Image"];
             NSString *picURL = snapshot.value[@"Profile Picture"];
             int CP = [combatPower intValue];

             cell.usernameOutlet.text = username;
             cell.dateOutlet.text = date;
             cell.combatPowerLabel.text = [NSString stringWithFormat:@"COMBAT POWER: %d", CP];
             cell.pokemonLabel.text = pokemon;
             [cell downloadUserImage:picURL];
             [cell downloadPokemonImage:pokemonURL];
         }
     }
        withCancelBlock:^(NSError * _Nonnull error)
     {
         NSLog(@"%@", error.localizedDescription);
     }];
    return cell;
}

Answer 1

调用

cellForRowAtIndex:方法＆＃34;每个＆＃34;单元格，所以你不应该在那里做你的数据库工作，它只负责创建一个＆＃34;一个＆＃34;一次一个细胞。

因此，请在observeEventType:或viewDidLoad:中移动viewDidAppear:来电，如：

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.ref = [[FIRDatabase database] reference];
    posts = [ref child:@"posts"];

    [posts observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot)
     {
         self.allSnapshots = [NSMutableArray array];

         for (snapshot in snapshot.children)
         {
                 [self.allSnapshots addObject:snapshot];
         }

         [self.tableView reloadData]; // Refresh table view after getting data
     } // .. error ...
}

并在numberOfRowsForInSection:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section      
{
    return [self.allSnapshots count];
}

并在cellForRowAtIndex:

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

    FIRDataSnapshot *snapshot = [self.allSnapshots objectAtIndex:indexPath.row]; 

    NSString *username = snapshot.value[@"Name"];
    NSString *date = snapshot.value[@"Date"];
    NSString *combatPower = snapshot.value[@"Combat Power"];
    NSString *pokemon = snapshot.value[@"Pokemon"];
    NSString *pokemonURL = snapshot.value[@"Pokemon Image"];
    NSString *picURL = snapshot.value[@"Profile Picture"];
    int CP = [combatPower intValue];

    cell.usernameOutlet.text = username;
    cell.dateOutlet.text = date;
    cell.combatPowerLabel.text = [NSString stringWithFormat:@"COMBAT POWER: %d", CP];
    cell.pokemonLabel.text = pokemon;
    [cell downloadUserImage:picURL];
    [cell downloadPokemonImage:pokemonURL];

    return cell;
}

UITableView重复Firebase数据

1 个答案: