刷新 UITableView 在第三个单元格后崩溃后滚动到顶部 [英] Scroll to top after refreshing UITableView crashes after third cell

问题描述

在我的刷新方法中，我使用以下代码滚动到顶部，这工作正常，但是当我在第三个单元格之后向下滚动并再次点击刷新时，应用程序崩溃，错误终止，未捕获异常输入 NSException.

In my refresh method I'm using the following code to scroll to top which is working fine, but when I scroll down after the third cell and hit refresh again it crashes the app with error terminating with uncaught exception of type NSException.

[TableView scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];

UITableView 有 7 个动态单元格.我是否需要添加一些东西以使其适用于整个 tableview?

The UITableView has 7 dynamic cells. Do I need to add something to make it work for the whole tableview?

我在 StackOverflow 上搜索了一个解决方案，但不幸的是没有一个解决了我的问题.

I searched on StackOverflow for a solution, but none of them solved my problem unfortunately.

推荐答案

给你...

- (void)viewDidLoad
{
    [super viewDidLoad];

    NewsTbView.delegate = self;
    NewsTbView.dataSource = self;

    [self refresh]; 

}

-(void)refresh
{
    catName = @"All";
    self.imageArray = [[NSMutableArray alloc]init];
    self.titleArray = [[NSMutableArray alloc]init];
    self.descArray = [[NSMutableArray alloc]init];
    self.dateArray = [[NSMutableArray alloc]init];
    self.linkArray = [[NSMutableArray alloc]init];
    self.categoryArray = [[NSMutableArray alloc]init];
    self.categoryNewsArray = [[NSMutableArray alloc]init];

    self.imageCatArray = [[NSMutableArray alloc]init];
    self.titleCatArray = [[NSMutableArray alloc]init];
    self.descCatArray = [[NSMutableArray alloc]init];
    self.dateCatArray = [[NSMutableArray alloc]init];
    self.linkCatArray = [[NSMutableArray alloc]init];
    // Create the request.
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:[config getXmlWordPress]]];

    // Create url connection and fire request

    conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];

    MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];

    hud.mode = MBProgressHUDModeIndeterminate;
    hud.labelText = @"Verversen";
    hud.dimBackground = YES;

    [NewsTbView scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];

}

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

    static NSString *CellIdentifier = @"CellIndent";
    TableViewCellHome *cell = (TableViewCellHome *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    NSString *CellName;

    CellName = @"TableViewCellHome";


    if (cell == nil) {

        UIViewController *c = [[UIViewController alloc] initWithNibName:CellName bundle:nil];

        cell = (TableViewCellHome *)c.view;
    }


    cell.textLabel.numberOfLines = 0;


    [cell.txtDate setAlpha:0];
    [cell.txtTitle setAlpha:0];
    [cell.btnShare setAlpha:0];
    [cell.imgNews setAlpha:0];

    [UIView beginAnimations:@"CustomCellAnimation" context:NULL];
    [UIView setAnimationDuration:1.0f];
    [cell.txtDate setAlpha:1];
    [cell.txtTitle setAlpha:1];
    //[cell.btnShare setAlpha:1];
    [cell.imgNews setAlpha:1];
    [UIView commitAnimations];



    if ([catName isEqualToString:@"All"]) {
        cell.txtTitle.text = [titleArray objectAtIndex:indexPath.row];
        cell.txtDate.text = [dateArray objectAtIndex:indexPath.row];
        [cell.imgNews setImage:[imageArray objectAtIndex:indexPath.row]];
        [cell.btnShare    addTarget:self
                             action:@selector(sharePost:)
                   forControlEvents:UIControlEventTouchUpInside];
        cell.btnShare.tag = indexPath.row;


    }
    else
    {
        cell.txtTitle.text = [titleCatArray objectAtIndex:indexPath.row];
        cell.txtDate.text = [dateCatArray objectAtIndex:indexPath.row];
        [cell.imgNews setImage:[imageCatArray objectAtIndex:indexPath.row]];
        [cell.btnShare    addTarget:self
                             action:@selector(sharePost:)
                   forControlEvents:UIControlEventTouchUpInside];
        cell.btnShare.tag = indexPath.row;

    }


    return cell;
}

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