TableviewCell意外更改

Question

我已经创建了一个包含表格视图的应用程序，现在我正在设置单元格的背景，并为分隔符添加一个视图。它看起来很好，但是当tebleview滚动时，我的分隔符就消失了。像这样，

第一次

当表格滚动时

​

这是我添加tableview的代码

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *SimpleTableIdentifier;
    UITableViewCell * cell;

    SimpleTableIdentifier = @"SimpleTableIdentifier";
    cell = [tableView  dequeueReusableCellWithIdentifier: nil];

    if(cell == nil) {

        cell = [[UITableViewCell alloc]
                initWithStyle:UITableViewCellStyleDefault
                reuseIdentifier:SimpleTableIdentifier];

        // Configure the cell...
        UIView* bgview = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1, 1)];
        bgview.opaque = YES;
        bgview.backgroundColor = [UIColor colorWithRed:(224/255.0) green:(230/255.0) blue:(241/255.0) alpha:1];
        [cell setBackgroundView:bgview];

        UIView* separatorLineView = [[UIView alloc] initWithFrame:CGRectMake(0, 44, 320, 1)];
        separatorLineView.backgroundColor = [UIColor colorWithRed:(74/255.0) green:(89/255.0) blue:(138/255.0) alpha:1];// you can also put image here
        [cell.contentView addSubview:separatorLineView];
    }
    return cell;
}

Answer 1

使用

   cell = [tableView  dequeueReusableCellWithIdentifier: SimpleTableIdentifier];

试一试

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *SimpleTableIdentifier;
    UITableViewCell * cell;

    SimpleTableIdentifier = @"SimpleTableIdentifier";
    cell = [tableView  dequeueReusableCellWithIdentifier: SimpleTableIdentifier];

    if(cell == nil) {

        cell = [[UITableViewCell alloc]
                initWithStyle:UITableViewCellStyleDefault
                reuseIdentifier:SimpleTableIdentifier];
        UIView* separatorLineView = [[UIView alloc] initWithFrame:CGRectMake(0, 42, 320, 1)];
        [separatorLineView setTag:1];
        [cell.contentView addSubview:separatorLineView];

        UIView* bgview = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1, 1)];
        bgview.opaque = YES;
        bgview.backgroundColor = [UIColor colorWithRed:(224/255.0) green:(230/255.0) blue:(241/255.0) alpha:1];
        [cell setBackgroundView:bgview];



    }

    UIView *SPview=[cell viewWithTag:1];
    SPview.backgroundColor = [UIColor blueColor];// you can also put image here

    return cell;
}

问题是您为视图设置的框架我将分隔线原始的44帧更改为42帧，现在它可以正常工作

Answer 2

将单元的配置移到之外

if (cell == nil) {
    cell = [tableView dequeueReusableCellWithIdentifier:SimpleTableIdentifier];
}

// everything else

应该能行得通。

Answer 3

使用它

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *SimpleTableIdentifier;
    UITableViewCell * cell;

    SimpleTableIdentifier = @"SimpleTableIdentifier";
    cell = [tableView  dequeueReusableCellWithIdentifier: nil];

    if(cell == nil) {

        cell = [[UITableViewCell alloc]
            initWithStyle:UITableViewCellStyleDefault
            reuseIdentifier:SimpleTableIdentifier];
    }

    // Configure the cell...
    UIView* bgview = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1, 1)];
    bgview.opaque = YES;
    bgview.backgroundColor = [UIColor colorWithRed:(224/255.0) green:(230/255.0) blue:(241/255.0) alpha:1];
    [cell setBackgroundView:bgview];

    UIView* separatorLineView = [[UIView alloc] initWithFrame:CGRectMake(0, 44, 320, 1)];
    separatorLineView.backgroundColor = [UIColor colorWithRed:(74/255.0) green:(89/255.0) blue:(138/255.0) alpha:1];// you can also put image here
    [cell.contentView addSubview:separatorLineView];

    return cell;
}