iphone - UITableView insertRowsAtIndexPaths :

Question

我有一个包含 uitableview 的导航 Controller ，当我按下一行时，它会在堆栈上弹出一个新的 View Controller ，该 Controller 用于在详细 View 中显示详细信息，它从服务器发出请求以获取一些响应信息，然后一旦返回信息，我就使用 insertRowsAtIndexPaths: 显示从服务器返回的信息。

第一次一切正常，然后当我按下后退按钮并选择一个新行或同一行以查看详细信息时，一旦调用 insertRowsAtIndexPaths: ，我会得到以下信息错误:

*** 由于未捕获的异常“NSInternalInconsistencyException”而终止应用程序，原因:“无效更新:第 1 节中的行数无效。更新 (2) 后现有节中包含的行数必须为等于更新前该部分中包含的行数 (2)，加上或减去从该部分插入或删除的行数(插入 1，删除 0)，并加上或减去移入或移出的行数该部分(0 人移入，0 人移出)。'

以下是将 View 插入堆栈的代码:

VideoDetailViewController_iPhone *nextView = [[VideoDetailViewController_iPhone alloc] initWithNibName:@"VideoDetailViewController_iPhone" bundle:nil withVideo:rowData];
    nextView.navController = navController;
[navController pushViewController:nextView animated:YES];
[nextView release];

这是从服务器返回信息后执行的代码

    - (void)fetchVideoDetail:(NSNotification *)notification {
        hasLoadedResponses = YES;

        NSArray *obj = (NSArray *)[notification object];
        responses = [[obj valueForKey:@"responses"] mutableCopy];
        //NSLog(@"RESPONSES: %@", responses);
        if ([responses count] == 0) {
            [tblView reloadData];
            return;
        }

        NSMutableArray *indexes = [[NSMutableArray alloc] init];

        int i = 0;
        for (NSArray *x in responses) {
            if (i > 0) {
                //The reason for skipping the first one is because we will change that row once the table refreshes we just need to insert any rows after the first one.
                [indexes addObject:[NSIndexPath indexPathForRow:i inSection:1]];
            }
            i++;
        }
        //NSLog(@"indexCount: %i", [indexes count]);
        [tblView beginUpdates];
        [tblView insertRowsAtIndexPaths:indexes withRowAnimation:UITableViewRowAnimationBottom];
        [tblView endUpdates];
        //[tblView reloadData];
    }

这是 tableView 方法:

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    // Return the number of sections.
    return 2;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    // Return the number of rows in the section.
    if (section == 0) {
        return 1;
    } else {
        if ([responses count] == 0) {
            NSLog(@"numberofrowsinsection: 1");
            return 1;
        } else {
            NSLog(@"numberofrowsinsection: %i", [responses count]);
            return [responses count];
        }
    }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    VideoCell *cell = (VideoCell *)[tableView dequeueReusableCellWithIdentifier:CellClassName];
    if (cell == nil) {
        NSArray *topLevelItems = [cellLoader instantiateWithOwner:self options:nil];
        cell = [topLevelItems objectAtIndex:0];
    }

    if (indexPath.section == 0) {
            cell.lblTitle.text = [data title];
            cell.lblDescription.text = [data videoDescription];
    } else {
        if ([responses count] == 0) {
            if (!hasLoadedResponses) {
                cell.lblTitle.text = @"";
                cell.lblDescription.text = @"";
            } else {
                //Responses have been loaded
                cell.accessoryType = UITableViewCellAccessoryNone;
                cell.selectionStyle = UITableViewCellSelectionStyleNone;

                cell.lblTitle.text = @"No responses to this video";
                cell.lblDescription.text = @"Be the first to respond by selecting the \"Set as Destination\" button above";
            }
        } else {
            //Display the response information
            cell.lblTitle.text = [[responses objectAtIndex:indexPath.row] valueForKey:@"title"];
            cell.lblDescription.text = [[responses objectAtIndex:indexPath.row] valueForKey:@"description"];
        }
    }

    return cell;
}

Answer 1

您的数据源和行数不同步。当您插入行时，您必须同时增加该部分中的行数。在这种情况下，您必须增加在 numberOfRowsInSection 方法中使用的数组 responses 的计数。