objective-c - 在 UITableView Objective-C 中的每一行附近添加标签颜色

Question

我有一个包含不同部分和行的 UITableView。我想用不同的标签或图像(如图标)关闭每个单元格，但我不知道为什么它看起来像这张图片:

滚动也改变了标签的大小!

代码如下:

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

NSString *key = [[self sectionKeys] objectAtIndex:[indexPath section]];
NSArray *contents = [[self sectionContents] objectForKey:key];
NSString *contentForThisRow = [contents objectAtIndex:[indexPath row]];

static NSString *CellIdentifier = @"CellIdentifier";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault  
reuseIdentifier:CellIdentifier];
}
if(indexPath.row == 0)
{
    UILabel* label = [[UILabel alloc] initWithFrame:CGRectMake(3,0,40,40)];
    label.backgroundColor = [UIColor darkGrayColor];
    [cell.contentView addSubview:label];

}
else if(indexPath.row == 1)
{
    UILabel* label = [[UILabel alloc] initWithFrame:CGRectMake(3,0,40,40)];
    label.backgroundColor = [UIColor redColor];
    [cell.contentView addSubview:label];    }
else if(indexPath.row == 2)
{
    UILabel* label = [[UILabel alloc] initWithFrame:CGRectMake(3,0,40,40)];
    label.backgroundColor = [UIColor redColor];
    [cell.contentView addSubview:label];    }
else{

}
[[cell textLabel] setText:contentForThisRow];
return cell;
}

Answer 1

在您的代码中，当用户滚动表格时，标签创建了很多次!您必须检查颜色标签是否已存在于单元格中，然后设置颜色

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
int colorLabelTag = 9999;
if (cell == nil)
{
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault  
                                  reuseIdentifier:CellIdentifier];     
}

// Because table cells are reusing we must check is label already in cell
UILabel* label = (UILabel *) [cell viewWithTag:colorLabelTag];
// If no - we create label
if (!label) {
    UILabel* label = [[UILabel alloc] initWithFrame:CGRectMake(3,0,40,40)];
    label.tag = colorLabelTag;
    [cell addSubview:label];
}

if(indexPath.row == 0)
{
    label.backgroundColor = [UIColor darkGrayColor];        
}
else if(indexPath.row == 1)
{
    label.backgroundColor = [UIColor redColor];
}
else if(indexPath.row == 2)
{
    label.backgroundColor = [UIColor redColor];
}
[[cell textLabel] setText:contentForThisRow];
return cell;