How to add UIButton Programmatically from a NSObject Class

I am trying to create a uibutton in a NSObject class. i get the error " Use of unresolved identifier 'view'". i figured that it needs to have UIViewController for it to work.

is there a work around so that i create multiple buttons with just this on multiple view controllers. what am i missing?

func createButton () {
    let button = UIButton();
    button.setTitle("Add", forState: .Normal)
    button.setTitleColor(UIColor.blueColor(), forState: .Normal)
    button.frame = CGRectMake(15, -50, 200, 100)
    view.addSubview(button)
}

via Chebli Mohamed