UITableViewCell 一遍又一遍地重复

Question

我正在从一个数组创建我的单元格。我所在区域的最后一个对象的创建方式不同，因为我想将一个新的 UILabel 添加到单元格的 contentView 中。 （以便它在最后一个单元格中显示 UILabel 中的记录总数）。

由于某种原因，我最后一个将 UILabel 添加到 contentView 的单元格不断重复。它会出现在其他单元格上，搞砸它们的显示等。我感觉这与单元格重复使用有关，但我不知道如何修复它。

这是我的方法：

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

    // Bounds
    CGRect bounds = [[UIScreen mainScreen] bounds];

    Person *person = nil;
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        person = [people objectAtIndex:indexPath.row];
    }

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellID];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:kCellID] autorelease];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

        // Check if it is the first cell
        if (person == [people lastObject]) {
            cell.accessoryType = UITableViewCellAccessoryNone;
            cell.userInteractionEnabled = NO;

            UILabel *count = [[UILabel alloc] initWithFrame:CGRectMake(-4, 11, bounds.size.width - 10, 20)];
            count.autoresizingMask = UIViewAutoresizingFlexibleWidth;
            count.textColor = [UIColor darkGrayColor];
            count.font = [UIFont systemFontOfSize:16];
            count.textAlignment = UITextAlignmentCenter;
            count.text = person.nameFirst;
            cell.textLabel.text = nil;
            cell.detailTextLabel.text = nil;
            [cell.contentView addSubview:count];

            return cell;
        }

    }//end

    cell.textLabel.text = [NSString stringWithFormat:@"%@, %@", person.nameLast, person.nameFirst];

    // Check if they are faculty staff
    if ([person.status isEqualToString:@"Staff/Faculty"]) {
        cell.detailTextLabel.text = [NSString stringWithFormat:@"%@: %@", person.status, person.department];
    } else {
        cell.detailTextLabel.text = person.status;
    }//end

    return cell;
}

有人可以帮助我了解如何让它正常工作，以便我的 UILabel 不会在不同的单元格上创建吗？

Answer 1

我在下面调整了你的方法。基本上，您需要在创建单元格时使单元格出列并执行任何单元格范围的设置（披露等）。任何单个单元格的更改都应在单元格出列后进行。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *kCellID = @"cellID";
    static NSString *lastCellID = @"lastcellID";

    // Bounds
    CGRect bounds = [[UIScreen mainScreen] bounds];

    Person *person = nil;
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        person = [people objectAtIndex:indexPath.row];
    }

    UITableViewCell *cell;

    if (person != [people lastObject]) {
        cell = [tableView dequeueReusableCellWithIdentifier:kCellID];
        if (cell == nil) {
            cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:kCellID] autorelease];
            cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
        }
        cell.textLabel.text = [NSString stringWithFormat:@"%@, %@", person.nameLast, person.nameFirst];

        // Check if they are faculty staff
        if ([person.status isEqualToString:@"Staff/Faculty"]) {
            cell.detailTextLabel.text = [NSString stringWithFormat:@"%@: %@", person.status, person.department];
        } else {
            cell.detailTextLabel.text = person.status;
        }//end
    } else {
        cell = [tableView dequeueReusableCellWithIdentifier:lastCellID];
        if (cell == nil) {
           cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:lastCellID] autorelease];
           cell.accessoryType = UITableViewCellAccessoryNone;
           cell.userInteractionEnabled = NO;

            UILabel *count = [[UILabel alloc] initWithFrame:CGRectMake(-4, 11, bounds.size.width - 10, 20)];
            count.autoresizingMask = UIViewAutoresizingFlexibleWidth;
            count.textColor = [UIColor darkGrayColor];
            count.font = [UIFont systemFontOfSize:16];
            count.textAlignment = UITextAlignmentCenter;
            count.tag = 1;
            [cell.contentView addSubview:count];
        }
        UILabel *count = (UILabel *)[cell viewWithTag:1];
        count.text = person.nameFirst;
        //cell.textLabel.text = nil;
        //cell.detailTextLabel.text = nil;
    }//end

    return cell;
}

Answer 2

这可能是因为单元格将被重复使用。为最后一个单元格使用不同的重用标识符，例如 kLastCellID。

UITableViewCell *cell = nil;
// Check if it is the first cell
if (person == [people lastObject]) {
    cell = [tableView dequeueReusableCellWithIdentifier:kLastCellID];
    if (!cell) {
        //create a last cell, with an UILabel in your content view
    }
    //update the cell's content
} else {
    cell = [tableView dequeueReusableCellWithIdentifier:kCellID];
    if (!cell) {
        //create a regular cell
    }
    //update the cell's content
}