ios - 标签在滚动时在重复

Question

我有一个屏幕，其中有一个UIScrollView。 UITableView嵌入其中。我遭受的问题是单元重用。我将在此处附上一些屏幕截图以阐明问题。

滚动之前:屏幕加载时。



滚动时:

然后向上滚动回:

如您所见，由于单元的重复使用，现在显示LBM代替日期。由于这是一个内置的组表单元，因此我无法使用prepForReuse。

我在这里附加cellForRowAtIndexPath的代码。

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

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell * cell = (UITableViewCell *)[tableView 
     dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
            cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 
      reuseIdentifier:CellIdentifier] autorelease];
        // Here we are creating Custom Label to Display the TakenTime and TakenDate of Vitals
        // in center.
        if (indexPath.row==0) {
            lbl_title = [[UILabel alloc] initWithFrame:CGRectMake(0, 2, 320, 33)];
            lbl_title.textAlignment = UITextAlignmentCenter;
            lbl_title.font = [UIFont boldSystemFontOfSize:14];
            lbl_title.textColor = [UIColor whiteColor];
            lbl_title.backgroundColor = [UIColor clearColor];
            [cell.contentView addSubview:lbl_title];
        }

    }

    switch (indexPath.row) {
        case 0:
            lbl_title.text = [NSString stringWithFormat:@"%@ %@",[dic_vitalsDictonary 
        valueForKey:@"taken_date"],[dic_vitalsDictonary valueForKey:@"taken_time"]];
            break;
        case 1:
            cell.textLabel.text = @"Height";
            NSString * str_height = [[dic_vitalsDictonary valueForKey:@"height"]  floatValue] 
            > 0 ? [dic_vitalsDictonary valueForKey:@"height"] : @"";
            cell.detailTextLabel.text = [self setDecimalFormatForString:str_height];
            break;
        case 2:
            cell.textLabel.text = @"Weight";
            NSString * str_weight = [[dic_vitalsDictonary valueForKey:@"weight"] floatValue] >
            0 ? [dic_vitalsDictonary valueForKey:@"weight"] : @"";
            cell.detailTextLabel.text = [self setDecimalFormatForString:str_weight];
            break;
        case 3:
            cell.textLabel.text = @"Temperature";
            NSString * str_temprature = [[dic_vitalsDictonary valueForKey:@"temp"] floatValue]
             > 0 ? [dic_vitalsDictonary valueForKey:@"temp"] : @"";
            cell.detailTextLabel.text = [self setDecimalFormatForString:str_temprature];
            break;
        case 4:
            cell.textLabel.text = @"Blood Pressure";
            NSString * str_lowbp = [dic_vitalsDictonary valueForKey:@"lowbp"];
            NSString * str_highbp = [dic_vitalsDictonary valueForKey:@"highbp"];
            cell.detailTextLabel.text = [NSString stringWithFormat:@"%@/%@",[self
            setDecimalFormatForString:str_lowbp],[self setDecimalFormatForString:str_highbp]];
            break;
        case 5:
            cell.textLabel.text = @"Blood Sugar";
            NSString * str_bs1 = [dic_vitalsDictonary valueForKey:@"bs_1"];
            NSString * str_bs2 = [dic_vitalsDictonary valueForKey:@"bs_2"];
            cell.detailTextLabel.text = [NSString stringWithFormat:@"%@/%@",[self 
            setDecimalFormatForString:str_bs1],[self setDecimalFormatForString:str_bs2]];
            break;
        case 6:
            cell.textLabel.text = @"Pulse";
            NSString * str_pulse = [[dic_vitalsDictonary valueForKey:@"pulse"] floatValue] > 0
            ? [dic_vitalsDictonary valueForKey:@"pulse"] : @"";
            cell.detailTextLabel.text = [self setDecimalFormatForString:str_pulse];
            break;
        case 7:
            cell.textLabel.text = @"Resp";
            NSString * str_resp = [[dic_vitalsDictonary valueForKey:@"resp"] floatValue] > 0 ?
            [dic_vitalsDictonary valueForKey:@"resp"] : @"";
            cell.detailTextLabel.text = [self setDecimalFormatForString:str_resp];
            break;
        case 8:
            cell.textLabel.text = @"Oxygen";
            NSString * str_oxyzen = [[dic_vitalsDictonary valueForKey:@"oxygen"] floatValue] >
            0 ? [dic_vitalsDictonary valueForKey:@"oxygen"] : @"";
            cell.detailTextLabel.text = [self setDecimalFormatForString:str_oxyzen];
            break;
        case 9:
            cell.textLabel.text = @"Fatmass";
            NSString * str_fatmass = [[dic_vitalsDictonary valueForKey:@"fatmass"] floatValue]
            > 0 ? [dic_vitalsDictonary valueForKey:@"fatmass"] : @"";
            cell.detailTextLabel.text = [self setDecimalFormatForString:str_fatmass];
            break;
        case 10:
            cell.textLabel.text = @"LBM";
            NSString * str_lbm = [[dic_vitalsDictonary valueForKey:@"lbm"] floatValue] > 0 ?
            [dic_vitalsDictonary valueForKey:@"lbm"] : @"";
            cell.detailTextLabel.text = [self setDecimalFormatForString:str_lbm];
            break;
        case 11:
            cell.textLabel.text = @"HC";
            NSString * str_hc = [[dic_vitalsDictonary valueForKey:@"hc"] floatValue] > 0 ? 
            [dic_vitalsDictonary valueForKey:@"hc"] : @"";
            cell.detailTextLabel.text = [self setDecimalFormatForString:str_hc];
            break;
        case 12:
            cell.textLabel.text = @"Peakflow";
            NSString * str_peakflow = [[dic_vitalsDictonary valueForKey:@"peakflow"] 
            floatValue] > 0 ? [dic_vitalsDictonary valueForKey:@"peakflow"] : @"";
            cell.detailTextLabel.text =[self setDecimalFormatForString:str_peakflow];
            break;
        default:
            break;
    }

    // Set the Background Image for TableviewCell.
    // if 1st row then we are showing different image to Display Vitals Date.

    if (indexPath.row==0) {

        cell.backgroundColor = [UIColor colorWithPatternImage:[UIImage 
        imageNamed:@"HeaderNavigation.png"]];
    }
    else{
        // Set the Background Image for TableviewCell.
        cell.backgroundColor = [UIColor colorWithPatternImage:[UIImage
         imageNamed:@"cell_background.png"]];
    }

    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    return cell;

}

请提出一些克服这种情况的方法。我已经尝试了很多，但似乎并没有达到我的预期效果。我想防止单元格被重复使用，以使其在滚动过程中不会重复。

Answer 1

尝试为每个单元提供唯一的标识符，

 NSString *CellIdentifier =[NSString stringWithFormat:"Cell %d",indexpath.row];

不知道这是否是正确的方法，但是应该可以解决您的问题。