public function setClass($class)
    {
        foreach ($this->results as $name) {
            $this->columns->offsetGet($name)->setClass($class);
        }
    }
public function setClass($class)
    {
        foreach ($this->results as $name) {
            $this->columns->offsetGet($name)->setClass($class);
        }
    }
public function setClass ( $ class ) { foreach ( $ this -> results as $ name ) { $ this -> columns -> offsetGet ( $ name ) -> setClass ( $ class ) ; } }
Set recommended css class.

@throws Exception\InvalidArgumentException

@param string $class css class

@return Column
Set recommended css class .