UITableViewCell中的重叠子视图

时间:2011-07-13 13:31:33

标签: iphone objective-c uitableview uiimageview

我坚持这个。我将用我的代码解释

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Cell";

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


   NSNumber *cellno=[NSNumber numberWithUnsignedInteger:indexPath.row];
   imgView = [[UIImageView alloc] initWithFrame:CGRectMake(240, 13, 15,18)];
   imgView.image=[UIImage imageNamed:@"lock.png"];

   tickView = [[UIImageView alloc] initWithFrame:CGRectMake(200, 13, 15,18)];
   tickView.image=[UIImage imageNamed:@"tick.png"];

   switch (indexPath.row) {
    case 0:
        cell.textLabel.text=@"apples";
        if ([appDelegate.connected containsObject:cellno]) { //condition
            [cell.contentView addSubview:tickView];
        }else{
            [cell.contentView addSubview:imgView];
        }
        break;
    }
    cell.accessoryType=UITableViewCellAccessoryDetailDisclosureButton;
    return cell;
}

在第一次加载tableview时,'imgView'子视图被添加到单元格内容视图中,并且在一些操作之后满足'if'条件并添加'tickView'。

问题是,旧视图未被隐藏或删除,因此两个图像都会出现。

非常感谢帮助

Both the tickview and imgView appears

1 个答案:

答案 0 :(得分:0)

不是在cellForRowAtIndexPath方法中创建imgView和tickView视图,而是在创建单元格时创建它们并将其重用于单元格。然后你可以这样做:

...

if (cell == nil) {
   cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
   imgView = [[UIImageView alloc] initWithFrame:CGRectMake(240, 13, 15,18)];
   imgView.image=[UIImage imageNamed:@"lock.png"];

   tickView = [[UIImageView alloc] initWithFrame:CGRectMake(200, 13, 15,18)];
   tickView.image=[UIImage imageNamed:@"tick.png"];
}

...


if ([appDelegate.connected containsObject:cellno]) { //condition
    [imgView removeFromSuperview];
    [cell.contentView addSubview:tickView];
}else{
    [tickView removeFromSuperview];
    [cell.contentView addSubview:imgView];
}
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