怎么使radioButtonList不换行
<div class="row">
<?php echo $form->labelEx($model,'sex'); ?>
<?php echo $form->radioButtonList($model,'sex',array('0'=>'male','1'=>'female'),array('template'=>'<span class="radio">{input}{label}</span>','separator'=>''));?>
<?php echo $form->error($model,'sex'); ?>
</div>