Yii change layout in controller?

Question

Yii

people tell me how to do the following in the controller?

If ($_GET['mode'] == 1 ) public $layout='//layouts/column2';
else public $layout='//layouts/column1';

Answer 1

You can put the code that changes the $layout field in your controller action:

public function actionIndex($mode)
{
    if ($mode == 1)
        $this->layout = "//layouts/column2";
    else
        $this->layout = "//layouts/column1";

        $dataProvider=new CActiveDataProvider('Passport');
    $this->render('index',array(
      'dataProvider'=>$dataProvider,
    ));

Answer 2

If ($_GET['mode'] == 1 ) {
  $this->layout='//layouts/column2';
} else {
  $this->layout='//layouts/column1'; 
}

Answer 3

Still needs to be announced.
public $layout;