heightForRowAtIndexPath崩溃

Question

我有以下代码：

- (CGFloat)tableView:(UITableView *) tableView heightForRowAtIndexPath:(NSIndexPath *) indexPath{
    TestCell* cell = (ConvoreCell *) [tableView cellForRowAtIndexPath:indexPath];
    CGSize textSize = [[cell text] sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:CGSizeMake([tableView frame].size.width - 20, 500)];
    return 80;
}

它在cellForRowAtIndexPath上崩溃了，为什么会这样？日志没有告诉我任何事情。这是我的cellForRowAtIndexPath方法：

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

    static NSString *CellIdentifier = @"ConvoreCell";
    AsyncImageView *asyncImageView = nil;
    TestCell * cell = (TestCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"TestCell" owner:nil options:nil];
        for (id currentObject in topLevelObjects){
            if ([currentObject isKindOfClass:[UITableViewCell class]]){
                cell = (ConvoreCell *) currentObject;
                break;
            }
        }
        asyncImageView = [[[AsyncImageView alloc] init] autorelease];
        asyncImageView.imageview = cell.icon;
    }
    else {
        asyncImageView = (AsyncImageView *) [cell.contentView viewWithTag:ASYNC_IMAGE_TAG];
    }

    NSMutableDictionary *cellValue = [results objectAtIndex:indexPath.row];

    NSString *picURL = [[cellValue objectForKey:@"user"] objectForKey:@"img"];
    if ([picURL isEqualToString:@"https://secure.gravatar.com/avatar/1f043010eb1652b3fab3678167dc0487/?default=https%3A%2F%2Fconvore.com%2Fmedia%2Fimages%2Feric.png&s=80"])
        picURL = @"https://test.com/media/images/eric.png";

    [asyncImageView loadImageFromURL:[NSURL URLWithString:picURL]];

    cell.title.text = [cellValue objectForKey:@"message"];
    cell.info.text = [NSString stringWithFormat:@"%@ %@ days ago", [[cellValue objectForKey:@"user"] objectForKey:@"username"], [cellValue objectForKey:@"date_created"] ];

    return cell;
}

我想要做的就是根据cell.title.text ....来调整单元格的高度。

Answer 1

手动调用cellForRowAtIndexPath是错误的。您必须将这些字符串分别存储在数组中并从那里获取它们。

经验法则：不要手动调用框架回调。