滚动时复制UITableViewCell contentView的子视图(UIButton和UIImageView)
滚动时复制UITableViewCell contentView的子视图(UIButton和UIImageView)
提问于 2012-10-17 20:29:11
在我的tableView中，在一些单元格中，我添加了一个imageView作为单元格contentView的子视图。在上下滚动tableView时，这些图像也会复制到其他单元格上。但是这个问题并不总是发生。请提出一个解决方案..我正在使用下面的代码。
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
if (friendsArray.count != 0)
{
NSString *str = [friendsIdArray objectAtIndex:indexPath.row];
if ([pendingRequests containsObject:str])
{
// Add image for pending item
UIImageView *pendImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"pendng.png"]];
pendImage.frame = CGRectMake(220.0, 2.5, 70, 40);
pendImage.tag = indexPath.row;
[cell.contentView addSubview:pendImage];
}
}
}
NSString *object;
if (friendsArray.count == 0)
{
if ([cell.contentView viewWithTag:indexPath.row])
{
for (UIView *subview in [cell.contentView subviews])
{
[subview removeFromSuperview];
}
}
object = @"No friends added to the list";
cell.textLabel.textAlignment = UITextAlignmentCenter;
}
else
{
object = [friendsArray objectAtIndex:indexPath.row];
cell.textLabel.textAlignment = UITextAlignmentLeft;
if (![cell.contentView viewWithTag:indexPath.row])
{
NSString *str = [friendsIdArray objectAtIndex:indexPath.row];
if ([pendingRequests containsObject:str])
{
// Add image for pending item
UIImageView *pendImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"pendng.png"]];
pendImage.frame = CGRectMake(220.0, 2.5, 70, 40);
pendImage.tag = indexPath.row;
[cell.contentView addSubview:pendImage];
}
}
}回答 3
Stack Overflow用户
回答已采纳
发布于 2012-10-19 17:00:40
现在问题已经解决了。我在创建新tableViewCell的else用例中使用了下面这行代码。
[cell.contentView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];我编辑了我的代码，如下所示：
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
}
else
{
[cell.contentView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
}Stack Overflow用户
发布于 2012-10-17 20:35:50
尝试下面的代码..
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
if (friendsArray.count != 0)
{
NSString *str = [friendsIdArray objectAtIndex:indexPath.row];
if ([pendingRequests containsObject:str])
{
// Add image for pending item
UIImageView *pendImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"pendng.png"]];
pendImage.frame = CGRectMake(220.0, 2.5, 70, 40);
pendImage.tag = indexPath.row;
[cell.contentView addSubview:pendImage];
}
}
NSString *object;
if (friendsArray.count == 0)
{
if ([cell.contentView viewWithTag:indexPath.row])
{
for (UIView *subview in [cell.contentView subviews])
{
[subview removeFromSuperview];
}
}
object = @"No friends added to the list";
cell.textLabel.textAlignment = UITextAlignmentCenter;
}
else
{
object = [friendsArray objectAtIndex:indexPath.row];
cell.textLabel.textAlignment = UITextAlignmentLeft;
if (![cell.contentView viewWithTag:indexPath.row])
{
NSString *str = [friendsIdArray objectAtIndex:indexPath.row];
if ([pendingRequests containsObject:str])
{
// Add image for pending item
UIImageView *pendImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"pendng.png"]];
pendImage.frame = CGRectMake(220.0, 2.5, 70, 40);
pendImage.tag = indexPath.row;
[cell.contentView addSubview:pendImage];
}
}
}
}Stack Overflow用户
发布于 2012-10-17 20:42:43
正如Romit Mewada建议的那样，你可以使用它，但是每次你有了alloc并添加新的UIImageView。
相反，您可以将nil发送到该UIImageView的映像。
以这种方式实现。
if (cell == nil)
{
//get your cell or alloc & initialize
// create and add imageView
}
UIImageView* imageView = [cell.contentView viewWithTag:indexPath.row];
imageView.image = nil;
//do your other task, you can use the same imageView to add other image for other row.页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/12934364
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