UIScrollView doesn't scroll and doesn't appear on the right position - ios

Question

I need a UIScrollView and a containerView to scroll the content I create. My code for that 2 items is:
var scrollView = UIScrollView()
var darkener = UIView()
var container = UIView()
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = UIColor.clearColor()
darkener = UIView(frame: self.view.frame)
darkener.backgroundColor = UIColor.blackColor()
darkener.alpha = 0.0
self.view.addSubview(darkener)
scrollView.frame = self.view.bounds
scrollView.backgroundColor = UIColor.clearColor()
scrollView.contentSize = CGSizeMake(scrollView.frame.width, scrollView.frame.height+1)
scrollView.delegate = self
self.view.addSubview(scrollView)
container = UIView(frame: CGRectMake(0, scrollView.frame.height, scrollView.frame.width, scrollView.frame.height))
container.backgroundColor = UIColor.whiteColor()
container.layer.masksToBounds = true
container.layer.cornerRadius = 10
scrollView.addSubview(container)
}
The problem is that the container view once I Set the Y point to scrollView.frame.height doesn't appear on the screen (it's on the bottom), but in a previous VC that code worked perfectly.
Also, it does not let me scroll on the content. What's wrong there?
If necessary I can upload the implementation, but this I think has no problem.

Answer 1

Solved. I just had to put that at the end of the ViewDidLoad to declare de frame:
The textField is the final label I have on the screen, to declare the limit of the screen.
self.container.frame = CGRectMake(0, self.container.frame.origin.y, self.container.frame.width, textField2.frame.origin.y + textField2.frame.height - 60)
self.scrollView.contentSize = CGSizeMake(self.container.frame.width, self.container.frame.height + 20.0)
And works Ok now.