tableView reloadData无法正常工作:不调用cellForRowAtIndexPath [英] tableView reloadData not working: cellForRowAtIndexPath not called

问题描述

我有此问题，reloadingData未调用cellForRowAtIndexPath.我已经花了很多时间了.我的xib文件dataSource和delegate连接到File's Owner.任何想法都欢迎.

I have this problem cellForRowAtIndexPath is not called by reloadingData. I have spent a lot of time with this. I xib file dataSource and delegate are connected to File's Owner. Any idea is welcome.

这是我的代码:

* cellForRowAtIndexPath *

*cellForRowAtIndexPath*

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {

        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];

        //cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
        cell.backgroundColor = [UIColor clearColor];
        cell.selectionStyle = UITableViewCellSelectionStyleGray;
        cell.backgroundView.opaque = NO;
        //cell.alpha = 0.65;

        cell.textLabel.backgroundColor = [UIColor clearColor];
        cell.textLabel.opaque = NO;
        cell.textLabel.textColor = [UIColor whiteColor];
        cell.textLabel.highlightedTextColor = [UIColor whiteColor];
        cell.textLabel.font = [UIFont boldSystemFontOfSize:18];

        cell.detailTextLabel.backgroundColor = [UIColor clearColor];
        cell.detailTextLabel.opaque = NO;
        cell.detailTextLabel.textColor = [UIColor whiteColor];
        cell.detailTextLabel.highlightedTextColor = [UIColor whiteColor];
        cell.detailTextLabel.font = [UIFont systemFontOfSize:14];

        NSString *temp = [distanceArray objectAtIndex:indexPath.row];
        if([checkMarkArray count] != 0){
          NSString *checkString = [checkMarkArray objectAtIndex:0];
          NSLog(@" checkString %@",checkString);
          if ([temp isEqualToString:checkString ]) {
            cell.accessoryView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"checked.png"]] autorelease];
        }
        else
        {
            cell.accessoryView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"unchecked.png"]] autorelease];
        }
        }

    }

    // Set up the cell...
    [[cell textLabel] setText: [distanceArray objectAtIndex:indexPath.row]] ;
   return cell;
}

didSelectRowAtIndexPath * ***

didSelectRowAtIndexPath****

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];
    cellText = selectedCell.textLabel.text;
    NSLog(@"%@",cellText);
    [checkMarkArray removeAllObjects];

    if([[tableViewDistance cellForRowAtIndexPath:indexPath] accessoryType] == UITableViewCellAccessoryCheckmark)
    {

        //global array to store selected object
        [checkMarkArray removeObject:[distanceArray objectAtIndex:indexPath.row]];
        NSLog(@"array %@",checkMarkArray);
        [tableViewDistance cellForRowAtIndexPath:indexPath].accessoryView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"unchecked.png"]] autorelease];

        [[tableViewDistance cellForRowAtIndexPath:indexPath] setAccessoryType:UITableViewCellAccessoryNone];

          [self.tableViewDistance  reloadData];
    }
    else
    {
        [checkMarkArray addObject:[distanceArray objectAtIndex:indexPath.row]];

        NSLog(@"array again %@",checkMarkArray);

        [tableViewDistance cellForRowAtIndexPath:indexPath].accessoryView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"checked.png"]] autorelease];

        [[tableViewDistance cellForRowAtIndexPath:indexPath] setAccessoryType:UITableViewCellAccessoryCheckmark];
          [self.tableViewDistance  reloadData];

    }
    tableViewDistance.delegate = self;
    tableViewDistance.dataSource = self;
    [self.tableViewDistance  reloadData];
}

* viewDidLoad ** *

*viewDidLoad***

- (void)viewDidLoad
{
    distanceArray= [[NSMutableArray alloc] initWithObjects:@"20 Kilomètres", @"40 Kilomètres", @"60 Kilomètres",@"80 Kilomètres",nil];
    NSLog(@"distance %@",distanceArray);
    tableViewDistance.backgroundColor=[UIColor clearColor];
    checkMarkArray = [[NSMutableArray alloc] init];
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

推荐答案

我在您的代码中发现了一些薄弱环节:

I've found some weak parts in your code:

1. 您应将cell.accessoryView设置为if (cell == nil){}

在- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath中，您可以使用tableView而不是tableViewDistance(可能是nil?)

In - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath you can use tableView and not use tableViewDistance (may be it is nil?)

在- (void)viewDidLoad中，您应该先调用[super viewDidLoad];，然后进行自定义.

In - (void)viewDidLoad you should call first [super viewDidLoad]; and then make customizations.

希望对您有所帮助. GL

Hope that will help you. Gl

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