UITableView 内容在滚动时合并？

Posted 2023-03-04

【中文标题】UITableView 内容在滚动时合并？

【英文标题】：UITableView contents are merging while scrolling?

【发布时间】：2016-01-08 11:15:12

【问题描述】：

我已经动态创建了UITableView 并尝试添加UILabel 和UIButton，但是当我们打开UIViewController 时它会正确出现，而当我尝试滚动时整个事情都搞砸了。

我根据我从服务器获得的字段 ID 动态添加 UITextFields 和 UIButtons。

这是我的cellForRowAtIndexPath 方法

更新

- (UITableViewCell *)tableView:(UITableView *)tableView1 cellForRowAtIndexPath:(NSIndexPath *)indexPath

    static NSString *MyIdentifier;
    if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"VARCHAR"])
        MyIdentifier = @"CharCell";

    else if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"INTEGER"])
        MyIdentifier = @"IntCell";
    else
        MyIdentifier = @"IntCell11";
    
    cell.textLabel.text = Nil;

    cell= [tableView1 dequeueReusableCellWithIdentifier:MyIdentifier];
    if (cell == nil)
    
        cell = [[dynamicCell alloc] initWithStyle:UITableViewCellStyleDefault
                                  reuseIdentifier:MyIdentifier];

        
        cell.selectionStyle=UITableViewCellSelectionStyleNone;

        cell.selectionStyle = UITableViewCellSelectionStyleNone;
         cell.accessoryType = UITableViewCellAccessoryNone;

        //cell.clipsToBounds=YES;
        if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"VARCHAR"])
            [cell.contentView addSubview:[self getLabel:indexPath.row]];

            [cell.contentView addSubview:[self getVarcharTextfield:indexPath.row:[[selectedTabFields valueForKey:@"value"] objectAtIndex:indexPath.row]]];

        else if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"INTEGER"])
            [cell.contentView addSubview:[self getLabel:indexPath.row]];

            [cell.contentView addSubview:[self getIntegerTextfield:indexPath.row:[[selectedTabFields valueForKey:@"value"] objectAtIndex:indexPath.row]]];

        else if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"SINGLESELECT"])
            NSString *title=[[selectedTabFields valueForKey:@"name"]objectAtIndex:indexPath.row];

            NSLog(@"single runing");

            [cell.contentView addSubview:[self getSingleSelectLabel:indexPath.item :title]];

            [cell.contentView addSubview:[self addView:indexPath.row :[dynamicOptionFields objectAtIndex:indexPath.row] :[[selectedTabFields valueForKey:@"value"] objectAtIndex:indexPath.row]]];

        else if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"MULTISELECT"])

            NSLog(@"runing");
            [cell.contentView addSubview:[self getLabel:indexPath.row]];

            [cell.contentView addSubview:[self addMultiSelectView:indexPath.row:[dynamicOptionFields objectAtIndex:indexPath.row]:[[selectedTabFields valueForKey:@"value"] objectAtIndex:indexPath.row]]];

        




    return cell;

请查看附件截图

加载页面时

当我向下滚动时，它会变成这样

现在它没有合并，但是当我向下滚动时，我可以看到重复的单元格。 例如：我可以多次看到我的第一行（在滚动结束时）

最新截图

【问题讨论】：

if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"INTEGER"]) MyIdentifier = @"IntCell"; else MyIdentifier = @"IntCell"; 一旦检查这两个语句都具有相同的标识符，就可以唯一地更改它们

解决它的肮脏方式是cell= [tableView1 dequeueReusableCellWithIdentifier:nil]; 但我再说一遍，这是一种肮脏的方式。

让我试试你的答案

@Bangalore 发布最新的屏幕截图

添加了新的截图

【参考方案1】：

当您在 tableviewcell 上一次又一次地添加相同的视图时，无需验证它是否已经存在。相反，您可以添加一次，然后根据您的条件隐藏/取消隐藏内容。

还有另一种方法：您可以为每个子视图设置标签并验证，如果 [cell viewWithTag:x] (x:Integer) 可用，则将其从视图中删除或使用相同的视图。

//cell.clipsToBounds=YES;
        if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"VARCHAR"])
// make check here before adding
            [cell.contentView addSubview:[self getLabel:indexPath.row]];
// make check here before adding
            [cell.contentView addSubview:[self getVarcharTextfield:indexPath.row:[[selectedTabFields valueForKey:@"value"] objectAtIndex:indexPath.row]]];

        else if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"INTEGER"])
// make check here before adding            
[cell.contentView addSubview:[self getLabel:indexPath.row]];
// make check here before adding
            [cell.contentView addSubview:[self getIntegerTextfield:indexPath.row:[[selectedTabFields valueForKey:@"value"] objectAtIndex:indexPath.row]]];

        

【参考方案2】：

请修改如下代码

- (UITableViewCell *)tableView:(UITableView *)tableView1 cellForRowAtIndexPath:(NSIndexPath *)indexPath

    static NSString *MyIdentifier;
    if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"VARCHAR"])
        MyIdentifier = @"CharCell";

    else if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"INTEGER"])
        MyIdentifier = @"IntCell";
    else
        MyIdentifier = @"IntCell11";
    


    cell= [tableView1 dequeueReusableCellWithIdentifier:MyIdentifier];
    if (cell == nil)
    
        cell = [[dynamicCell alloc] initWithStyle:UITableViewCellStyleDefault
                                  reuseIdentifier:MyIdentifier];
        
     cell.textLabel.text = Nil;
           cell.selectionStyle=UITableViewCellSelectionStyleNone;

        cell.selectionStyle = UITableViewCellSelectionStyleNone;
         cell.accessoryType = UITableViewCellAccessoryNone;

        //cell.clipsToBounds=YES;
        if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"VARCHAR"])
            [cell.contentView addSubview:[self getLabel:indexPath.row]];

            [cell.contentView addSubview:[self getVarcharTextfield:indexPath.row:[[selectedTabFields valueForKey:@"value"] objectAtIndex:indexPath.row]]];

        else if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"INTEGER"])
            [cell.contentView addSubview:[self getLabel:indexPath.row]];

            [cell.contentView addSubview:[self getIntegerTextfield:indexPath.row:[[selectedTabFields valueForKey:@"value"] objectAtIndex:indexPath.row]]];

        else if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"SINGLESELECT"])
            NSString *title=[[selectedTabFields valueForKey:@"name"]objectAtIndex:indexPath.row];

            NSLog(@"single runing");

            [cell.contentView addSubview:[self getSingleSelectLabel:indexPath.item :title]];

            [cell.contentView addSubview:[self addView:indexPath.row :[dynamicOptionFields objectAtIndex:indexPath.row] :[[selectedTabFields valueForKey:@"value"] objectAtIndex:indexPath.row]]];

        else if([[[selectedTabFields valueForKey:@"type"] objectAtIndex:indexPath.row] isEqualToString:@"MULTISELECT"])

            [cell.contentView addSubview:[self getLabel:indexPath.row]];

            [cell.contentView addSubview:[self addMultiSelectView:indexPath.row:[dynamicOptionFields objectAtIndex:indexPath.row]:[[selectedTabFields valueForKey:@"value"] objectAtIndex:indexPath.row]]];

    return cell;

【讨论】：

但它如何改变顺序以及如何相互合并？

@Bangalore 检查 dynamicCell 连接和初始化的

@Bangalore 也试试这个 cell.clipsToBounds=YES;

@Bangalore 你的代码在 put cell= [tableView1 dequeueReusableCellWithIdentifier:MyIdentifier]; 之前更好if (cell == nil) cell = [[dynamicCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier];其余代码来自 if 条件 if (cell == nil) 没有 else

是什么意思？没看懂？