UITableViewCell与UITableViewCellStyleValue1,在底部的单元格中向detailTextLabel添加新行

Question

在我的tableview上我有最后一个单元格,在第一张图片中看不到最初可见,当我向上滚动列表时,你可以在第二张图片中看到价格或我的detailTextLabel被放在一条不保持正确的新行上理由.
图片1 http://img706.imageshack.us/img706/4496/iphoneerror1.jpg

image 2 http://img706.imageshack.us/img706/6007/iphoneerror2edited.jpg

这是代码,我无法弄清楚为什么它这样做,任何方向或帮助将非常感激

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

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [ltableView dequeueReusableCellWithIdentifier:CellIdentifier];    
    // Configure the cell.
    NSUInteger indexRow = [indexPath row];
    switch (indexRow) {
        case 0:{
            NSCharacterSet *set = [NSCharacterSet whitespaceCharacterSet];
            NSString *description = [[currentData objectForKey:@"Description"] stringByTrimmingCharactersInSet:set];

            if (cell == nil) {
                    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
            }
            cell.selectionStyle =  UITableViewCellSelectionStyleNone;
            cell.accessoryType = UITableViewCellAccessoryNone;
            cellShift = 1;


            if (![description isEqualToString:@""]) {
                cell.textLabel.text = @"";
                cell.detailTextLabel.text = description;
                cell.detailTextLabel.numberOfLines = 2;
            }
            else {
                cell.textLabel.text = @"";
                cell.detailTextLabel.text = @"";
                cell.detailTextLabel.numberOfLines = 0;


            }
            break;
        }
        default:{
            if (cell == nil) {
                cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier] autorelease];
            }
            NSDictionary *item = [tableData objectAtIndex:(indexRow-cellShift)];
            NSString *name = [item objectForKey:@"Name"];
            if ([name length] > MaxVendorsLength ) {
                name =  [NSString stringWithFormat:@"%@ ...",[name substringToIndex:MaxVendorsLength]];
            }
            cell.textLabel.text = name;
            cell.textLabel.minimumFontSize = 12;

            NSString *priceString;
            float price = [[item objectForKey:@"Price"] floatValue];
            //NSLog(@"| %@ | : | %@ |",[item objectForKey:@"Name"], [item objectForKey:@"Price"]);
            if (price != 0) {
                priceString = [[NSString alloc] initWithFormat:@"$%.2f",price];
            }
            else {
                priceString = [[NSString alloc] initWithString:@"--"];
            }

            cell.detailTextLabel.text =  priceString;

            cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
            [priceString release];          
            break;
        }
    }
    cell.textLabel.font = [UIFont boldSystemFontOfSize:15];
    cell.textLabel.minimumFontSize = 14;
    cell.detailTextLabel.font = [UIFont boldSystemFontOfSize:15];
    cell.detailTextLabel.minimumFontSize = 14;
    return cell;
}

如果我需要发布任何其他内容以获取帮助,请告诉我???

Answer 1

这是因为当您向上滚动时,顶部单元格会被重复使用,因为所有单元格都具有相同的单元格标识符(您拥有的第一行).您需要声明两个单元格标识符,并根据您尝试获取的行使用相应的标识符.

static NSString *FirstRowCellIdentifier = @"A";
static NSString *OtherRowCellIdentifier = @"B";

NSString *cellIdentifier = nil;
if ([indexPath row] == 0)
    cellIdentifier = FirstRowCellIdentifier;
else
    cellIdentifer = OtherRowCellIdentifier;

UITableViewCell *cell = [ltableView dequeueReusableCellWithIdentifier:cellIdentifier];
// .....

然后您可以按原样使用其余代码.这只是确保重用的单元格类型正确.