Sliding-In UIView From Bottom - ios

Question

I am trying to build a custom-looking action sheet. I thought the easiest way would be creating a view as a subview and assign constraint of subview's top to superview's bottom. And at the same time assigning a cover view with some opacity. Thus, I could have different versions of subview and I can initialise the necessary one and slide it.
I couldn't find anything useful for Swift, so, using this obj-c answer, I tried to convert it to Swift. I achieved the opaque background with this however translating constraints doesn't seem to work.
var coverView = UIView()
override func viewDidLoad() {
super.viewDidLoad()
coverView.backgroundColor = UIColor(white: 0.0, alpha: 0.4)
coverView.alpha = 1.0
self.view.addSubview(coverView)
self.view.bringSubviewToFront(coverView)
}
//doesn't work
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[coverView]|", options: kNilOptions, metrics: nil, views: NSDictionaryOfVariableBindings(coverView)))
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|[coverView]|", options: kNilOptions, metrics: nil, views: NSDictionaryOfVariableBindings(coverView)))
I got confused on instantiating the view and applying transition animation. If I choose to create a UIView under ViewController, I cannot adjust constraints to adjust equal width of subview to superview.
How can I use the UIView that I created as a Subview (in Storyboard) and then adjust its width constraints so the UI doesn't bug? Also, how can I apply the transition animation so it seems natural?
This link should be here...

Answer 1

I suggested you use UIView xib file and design your view then load in your view controller.
Ex:
Step 1:
Create xib for view
Step 2:
Set background color black for this view, opacity 62% and Alpha = 1
Step 3:
Take new simple UIView and Design your actual view and set constraint.
For Exp:
In your case set view in bottom.
Step 4:
Load xib in view controller.
class calendarViewController: UIViewController
{
var popUpView: popUpView!
override func viewDidLoad() {
super.viewDidLoad()
bookingConfirmView = NSBundle.mainBundle().loadNibNamed("popUpView", owner: self, options: nil).first as! popUpView
// Set Delegate for xib textField
self.popUpView.Name.delegate = self
self.popUpView.MobileNo.delegate = self
}
}
Step 5:
Add this line to where you want to populate view.
self.view.addSubview(bookingConfirmView)
self.bookingConfirmView.frame = self.view.bounds