This can be done without a subclass using NSAttributedString and the attributedText property as follows:
UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"MyReuseIdentifier"];
NSAttributedString *text = [[NSAttributedString alloc] initWithString:@"Some Text"];
cell.textLabel.attributedText = text;
NSMutableParagraphStyle *subtitleParagraphStyle = [NSMutableParagraphStyle new];
subtitleParagraphStyle.minimumLineHeight = 20;
NSMutableAttributedString *subText = [[[NSAttributedString alloc] initWithString:@"Some Subtitle Text"] mutableCopy];
[subText addAttribute:NSParagraphStyleAttributeName value:subtitleParagraphStyle range:NSMakeRange(0, subText.length)];
cell.detailTextLabel.attributedText = subText;
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