Tukukkk

On the new iPhone X, what would be the most proper way to get both top and bottom height for the unsafe areas?

Try this :

In Objective C

if (@available(iOS 11.0, *)) {

    UIWindow *window = UIApplication.sharedApplication.keyWindow;

    CGFloat topPadding = window.safeAreaInsets.top;

    CGFloat bottomPadding = window.safeAreaInsets.bottom;

}

In Swift

if #available(iOS 11.0, *) {

    let window = UIApplication.shared.keyWindow

    let topPadding = window?.safeAreaInsets.top

    let bottomPadding = window?.safeAreaInsets.bottom

}

To get the height between the layout guides you just do

let guide = view.safeAreaLayoutGuide

let height = guide.layoutFrame.size.height

So full frame height = 812.0, safe area height = 734.0

Below is the example where the green view has frame of guide.layoutFrame

Swift 4

To pin a view to a safe area anchor using constraints can be done at any point in the view controller's lifecycle because constraints are handled by the auto layout API behind the scenes. However, to access the values of those safe areas to determine their heights requires waiting until later in the view controller's lifecycle, ideally viewDidLayoutSubviews().

This plugs into any view controller:

override func viewDidLayoutSubviews() {

    super.viewDidLayoutSubviews()



    var topSafeArea: CGFloat

    var bottomSafeArea: CGFloat



    if #available(iOS 11.0, *) {

        topSafeArea = view.safeAreaInsets.top

        bottomSafeArea = view.safeAreaInsets.bottom

    } else {

        topSafeArea = topLayoutGuide.length

        bottomSafeArea = bottomLayoutGuide.length

    }



    // safe area values are now available to use



}

I prefer this method to getting it off of the window because it’s how Apple designed the API to be used. Don't reference extraneous objects like the window when everything is already in the view controller. And by using viewDidLayoutSubviews(), safe area values are updated during orientation changes, double-height status bars, and all other mutations to the view and its safe areas.

I'm working with CocoaPods frameworks and in case UIApplication.shared is unavailable then I use safeAreaInsets in view's window:

if #available(iOS 11.0, *) {

    let insets = view.window?.safeAreaInsets

    let top = insets.top

    let bottom = insets.bottom

}

None of the other answers here worked for me, but this did.

var topSafeAreaHeight: CGFloat = 0

var bottomSafeAreaHeight: CGFloat = 0



  if #available(iOS 11.0, *) {

    let window = UIApplication.shared.windows[0]

    let safeFrame = window.safeAreaLayoutGuide.layoutFrame

    topSafeAreaHeight = safeFrame.minY

    bottomSafeAreaHeight = window.frame.maxY - safeFrame.maxY

  }