Question

我的数组充当了ViewDidAppear方法中填充的数据源。

-(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];

    PFQuery *userQuary = [PFUser query];
    PFRelation *friendRelation = [self.currentUser relationForKey:@"friendRelation"];
    PFQuery *acceptedQuary = [friendRelation query];
    PFQuery *pendingFriends = [PFQuery queryWithClassName:@"FriendRequest"];
  inQuery:aceptedFriends];

    [pendingFriends whereKey:@"toUser" equalTo:self.currentUser.objectId];
    [pendingFriends whereKey:@"status" equalTo:@"Pending"];
    [userQuary whereKey:@"objectId" matchesKey:@"fromUser" inQuery:pendingFriends];
    [userQuary findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
        if (error){
            NSLog(@"ERROR: %@ %@", error, [error userInfo]);
        }else{
            self.friendList = objects;

            [self.tableView reloadData];
        }
    }];


    [acceptedQuary findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
        if (error){
            NSLog(@"ERROR: %@ %@", error, [error userInfo]);
        }else{
       self.accepted = objects;
            NSLog(@"%@", self.accepted);
            [self.tableView reloadData];
        }
    }];




}

这是一个包含多个表格部分的应用程序，这里是发生崩溃的CellForRowAtIndexPath方法。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
    /*
    PFUser *friend = [self.friendList objectAtIndex:indexPath.row];
    cell.textLabel.text = friend.username;
    cell.detailTextLabel.text= friend.email;
    cell.imageView.image = [UIImage imageNamed:@"Treehouse.png"];
    */
    PFUser *friend = nil;
    if ([self.friendList count]> indexPath.row){
        friend =[self.friendList objectAtIndex:indexPath.row];
    }

    PFUser *acceptedFriend = nil;
    if ([self.accepted count] > 0){
       acceptedFriend = [self.accepted objectAtIndex:indexPath.row];

    }

    switch (indexPath.section) {
        case 0:
            if ([self.friendList count] > indexPath.row){
            cell.textLabel.text = friend.username;
            cell.detailTextLabel.text= friend.email;
            cell.imageView.image = [UIImage imageNamed:@"Treehouse.png"];
            }
            break;
        case 1:
            if ([self.accepted count] >indexPath.row){
            cell.textLabel.text = acceptedFriend.username;
            cell.detailTextLabel.text = acceptedFriend.email;
            cell.imageView.image = [UIImage imageNamed:@"Treehouse.png"];
            }
        default:
            cell.textLabel.text = @"Nothing Here";
            break;
    }
    // Configure the cell...


    return cell;
}

第一部分中没有显示数据，但第二部分有一个单元格列表，文字＆＃34; Nothing Here＆＃34; ，但是图片和{{ 1}}＆＃39; s正确显示。我希望在适当的部分填写数据，并在每个单元格中使用正确的名称。

编辑：我更改了friendList的数据源，它确实在其部分中显示数据。现在出现的问题是第2节显示默认值，但第1节没有显示默认值。

这是请求的numberOfRowsInSection方法

detailTextLabel

Answer 1

您的问题可能是因为您使用错误的方法设置数组：

-(void)viewDidAppear:(BOOL)animated

该方法发生在诸如numberOfRowsInSection和cellForRowAtIndexPath之类的UITableView方法运行后...

所以这意味着你可能会在那里得到空阵列......

尝试进行：

- (void)viewDidLoad

但如果你仍然希望它留在viewDidAppear方法中添加

[self.tableView reloadData];

更新tableView后的代码

多节表不显示数据

1 个答案: