Activity Indicator not showing on view controller

Question

I am trying to figure out why my activity indicator is not showing on my view controller, here is my code below

var activityIN : UIActivityIndicatorView = UIActivityIndicatorView(frame: CGRectMake(0,0, 50, 50)) as UIActivityIndicatorView
        activityIN.center = self.view.center
        activityIN.hidesWhenStopped = true
        activityIN.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
        activityIN.startAnimating()

Answer 1

Try this , see the last line you have forget that

var activityIN : UIActivityIndicatorView = UIActivityIndicatorView(frame: CGRectMake(100 ,200, 50, 50)) as UIActivityIndicatorView
activityIN.center = self.view.center
activityIN.hidesWhenStopped = true
activityIN.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
activityIN.startAnimating()
self.view.addSubview(activityIN)