Extra bottom space/padding on iPhone X?

Question

On the iPhone X in portrait mode, if you set a bottom constraint to safe area to 0, you will end up with an extra space at the bottom of the screen. How do you get programmatically the height of this extra padding ?

I managed to manually determine the height of this padding which is 34 and here is how I managed to implement it with iPhone X detection:

Swift 4.0 and Xcode 9.0

if UIDevice().userInterfaceIdiom == .phone
{
    switch UIScreen.main.nativeBounds.height
    {
        case 2436: //iPhone X
        self.keyboardInAppOffset.constant = -34.0
        default:
        self.keyboardInAppOffset.constant = 0
    }
}

Is there a cleaner way to detect the height of this padding ?

Emia

see this for ref : medium.com/@hacknicity/… – Spatterdash

look at this might be helpful medium.com/the-traveled-ios-developers-guide/… – Dip

Answer 1

In iOS 11, views have a safeAreaInsets property. If you get the bottom property of these insets you can get the height of the bottom padding while on iPhone X:

if #available(iOS 11.0, *) {
    let bottomPadding = view.safeAreaInsets.bottom
    // ...
}

(likewise for the top padding with status bar)

Wharfinger

Answer 2

In Objective-C

if (@available(iOS 11.0, *)) {
   UIWindow *window = UIApplication.sharedApplication.keyWindow;
   CGFloat bottomPadding = window.safeAreaInsets.bottom;
}

Kress

YES! The view.safeAreaInsets.bottom returned 0, your tip return correctly: 34. – Attainment

I echo the other user. YES! "The view.safeAreaInsets.bottom returned 0, your tip return correctly: 34." applied to me as well – Southland

This is useful when you want to get the "real" bottom safearea. If there is a tabbar down there, then I found that the vc.view.safeAreaInsets.bottom included the tabbar height, which makes sense. But I wanted my custom action sheet to cover the tool bar but not be all the way down to the bottom. So this gets me the number I need. – Southernmost

Answer 3

var bottomPadding: CGFloat = 0.0
if #available(iOS 11.0, *) {
     let window = UIApplication.shared.keyWindow
     bottomPadding = window?.safeAreaInsets.bottom ?? 0.0
}

Now you can use bottomPadding as per your needs.

Slide

Answer 4

If suddenly you have no view, for example, CollectionViewLayout, you can retrieve it from Window too:

private static var itemHeight: CGFloat {
    guard #available(iOS 11.0, *),
        let window = UIApplication.shared.keyWindow else {
            return Constants.itemHeight
    }
    return Constants.itemHeight - window.safeAreaInsets.bottom
}

Patman

Answer 5

iOS 13+ (a mix from answers above)

let padding = UIApplication.shared.windows.first?.safeAreaInsets.bottom ?? 0

Emersion

Answer 6

UIApplication.shared.windows.first?.safeAreaInsets.bottom ?? 0.0

iOS 13 and up

Anonymous

This should be higher since keyWindow is depreciated as of iOS 13 – Alcina

Answer 7

use this line to become your bottom value for iPhoneX

if #available(iOS 11.0, *) {
            let bottomPadding = view.safeAreaInsets.bottom
  }

and don't forget to add this in layoutSubviews() because safeAreaInsets has the correct size in layoutSubviews() otherwise you will become wrong values.

Synopsis