Subview on top of window view in Swift

Question

I want to place a UIView over the entire screen (including the navigation bar). This view will be black with 0.3 opacity. I want to do this to darken out the screen content and push a view on top of this. I am using this code:

UIApplication.sharedApplication().keyWindow?.addSubview(darkView)

This covers the whole screen as expected. However I now want to place another view on top of this dark view. Is there a way to do this? Everything I try just results in the view being under the dark view. Any pointers would be really appreciated! thanks

Why don't you just present a semi-transparent full screen controller from your current controller? If you think you need to add a view to the window, you are probably doing it wrong. — Sulthan, Jul 23 '16 at 09:14
You should implement this with custom transition, not this way. — Timur Bernikovich, May 22 '17 at 15:52

score 102 · Accepted Answer · edited Feb 17 '21 at 06:49

102

It's really simple.

You just add another view to window! And it will be there, on top of the first view you added. For example, this code adds a black view and a white view:

let window = UIApplication.sharedApplication().keyWindow!
let v = UIView(frame: window.bounds)
window.addSubview(v)
v.backgroundColor = UIColor.blackColor()
let v2 = UIView(frame: CGRect(x: 50, y: 50, width: 100, height: 50))
v2.backgroundColor = UIColor.whiteColor()
window.addSubview(v2)

You can also add the new view as a sub view of the first view you added:

let window = UIApplication.sharedApplication().keyWindow!
let v = UIView(frame: window.bounds)
window.addSubview(v)
v.backgroundColor = UIColor.blackColor()
let v2 = UIView(frame: CGRect(x: 50, y: 50, width: 100, height: 50))
v2.backgroundColor = UIColor.whiteColor()
v.addSubview(v2)

Swift 4

let window = UIApplication.shared.keyWindow!
let v = UIView(frame: window.bounds)
window.addSubview(v)
v.backgroundColor = .black
let v2 = UIView(frame: CGRect(x: 50, y: 50, width: 100, height: 50))
v2.backgroundColor = UIColor.white
v.addSubview(v2)

Simple!

edited Feb 17 '21 at 06:49

emrcftci

3,355
3
21
35

answered Jul 23 '16 at 09:32

Sweeper

213,210
22
193
313

1

Thanks for this, however is there a way of bringing a view from an existing view controller to the front of views in the window without directly adding it in though? – Kex Jul 23 '16 at 09:44
@Kex No, as far as I'm concerned. – Sweeper Jul 23 '16 at 09:49
In my case UIView is not covering entire screen. – bhupinder Mar 09 '18 at 11:06
After showing the alert view, when we want to show the popupwindowView, that is misplacing. – Anil Oct 03 '19 at 19:00
1

Need to change window variable as ----- let window = UIApplication.shared.windows.last! – Haseeb Javed Feb 16 '21 at 07:16

score 24 · Answer 2 · answered May 22 '17 at 15:50

24

For SWIFT 3 use this:

let window = UIApplication.shared.keyWindow!
window.addSubview(someView)

answered May 22 '17 at 15:50

Mario Jaramillo

567
6
9

score 8 · Answer 3 · answered Feb 16 '21 at 07:22

8

Swift 5:

let window = UIApplication.shared.windows.last!

let viewToShow = UIView(frame: CGRect(x: 0, y: 0, width: window.frame.size.width, height: 40.0))

viewToShow.backgroundColor = UIColor.white

window.addSubview(viewToShow)

answered Feb 16 '21 at 07:22

Haseeb Javed

1,769
17
20

score 7 · Answer 4 · edited Mar 01 '19 at 21:39

Swift 4, Adding a UIViewController as a subview to UIWindow

This code is for adding view controller as a subview, covering the whole window with simple animation.

let appDelegate = UIApplication.shared.delegate as! AppDelegate
var customReviewPopup = ReviewPopupViewController.init(nibName: "ReviewPopupViewController", bundle: Bundle.main)

self.appDelegate.window?.addSubview((customReviewPopup.view)!)
self.customReviewPopup.view.frame = (self.appDelegate.window?.bounds)!
self.customReviewPopup.view.alpha = 0
self.customReviewPopup.view.isHidden = true

UIView.animate(withDuration: 0.3, delay: 0, options: .transitionCrossDissolve, animations: {
    self.customReviewPopup.view.isHidden = false
    self.customReviewPopup.view.alpha = 1
}, completion: nil)

After showing the alert view, when we want to show the popupwindowView, that is misplacing. — Anil, Oct 03 '19 at 19:09

tianmin zeng · Answer 5 · 2023-03-01T23:23:44.623

0

UIApplication.shared.windows.filter {$0.isKeyWindow}.first?.windowScene?.windows.last  //This is better

UIApplication.shared.windows.last! //This will some times has bug, because system will add other scene into Application in runtime, for example add subview in UIImagePickerController`

edited Mar 01 '23 at 23:23

answered Mar 01 '23 at 23:22

tianmin zeng

11
2

Subview on top of window view in Swift

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