在Cakephp中使用帮助器来设置模板变量

Is it possible to set a template variable in a helper?

Ultimately what I'm trying to do is have a helper add in code to the header of the layout, for use with javascript and such.

Ways I can think of that I'd prefer not to use:

• Passing in the view object: don't want to worry about having to call an extra function
• using the "global" keyword to get the view, I really like to avoid using this except as a last resort since it's not considered orthodox

Any thoughts?

Update 2012-02-20: As cake as been updated more recently I've tried to include answers to Cake 1.2 as well as Cake 2. Thanks to Adam and mark for their recommendations

I discovered you can use the class registry to grab it, so I made this function in my helper:

/**
 * Access to the view for special operatoins
 */
protected function getView() {
    return ClassRegistry::getObject('view');
}

Update 2013-02-20: I wrote the above for Cake 1.2, Adam (in the comment below) suggested using $this->_View->viewVars['var'] for Cake 2.3 which looks good, but I don't have a way to test.