A view that animates upward without filling the screen - ios

Question

So this is what I am trying to do:
Here is the initial screen:
When the bottom pointing arrow is clicked there is a smaller view that transitions from bottom to top like this:
And as you can see the view in the back is dimmed. And when I click on the back view, the smaller sized view goes away by animating downwards.
There were several things that I tried:
1. I tried to segue modally which seemed to animate properly, namely, from bottom to top, but it covers the entire back view.
2. I tried to make the modal view only half the parent size by trying to replicate this post: Present modal view controller in half size parent controller. However, it did not work.
3. So I decided to put a UIView on top of my back view like so:
And I connected the grey colored view with the #IBOutlet weak var messageView: UIView!. And I tried using this code: UIView.transitionWithView(messageView, duration: 1.0, options: UIViewAnimationOptions.CurveEaseIn, animations: nil, completion: nil). However, nothing seems to be happening. Any suggestions on how to accomplish this?

Answer 1

For the Animation of button:
Add autolayout constraint to the BottomLayout Guide.And create an IBOutlet as
#IBOutlet weak var bottomConstraint: NSLayoutConstraint!
var shouldAnimateView:Bool = true
On the Action of the button you need to animate the View using constraint
#IBAction func showOrHideViewBtn(sender: AnyObject) {
if shouldAnimateView {
self.bottomConstraint.constant = self.view.frame.size.height/2+5
UIView.animateWithDuration(Double(0.2), animations: {
self.bottomConstraint.constant = self.view.frame.size.height/2 - self.toanimateView.frame.size.height
self.view.layoutIfNeeded()
})
}else{
self.bottomConstraint.constant = self.view.frame.size.height/2 - self.toanimateView.frame.size.height
UIView.animateWithDuration(Double(0.2), animations: {
self.bottomConstraint.constant = self.view.frame.size.height/2+5
self.view.layoutIfNeeded()
})
}
shouldAnimateView = !shouldAnimateView
}