Get safe area inset top and bottom heights

问题

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

回答1:

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
}

回答2:

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

回答3:

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.

回答4:

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
  }

回答5:

safeAreaLayoutGuide When the view is visible onscreen, this guide reflects the portion of the view that is not covered by navigation bars, tab bars, toolbars, and other ancestor views. (In tvOS, the safe area reflects the area not covered the screen's bezel.) If the view is not currently installed in a view hierarchy, or is not yet visible onscreen, the layout guide edges are equal to the edges of the view.

Then to get the height of the red arrow in the screenshot it's:

self.safeAreaLayoutGuide.layoutFrame.size.height

回答6:

In iOS 11 there is a method that tells when the safeArea has changed.

override func viewSafeAreaInsetsDidChange() {
    super.viewSafeAreaInsetsDidChange()
    let top = view.safeAreaInsets.top
    let bottom = view.safeAreaInsets.bottom
}

回答7:

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
}

回答8:

Objective-C Who had the problem when keyWindow is equal to nil. Just put the code above in viewDidAppear (not in viewDidLoad)

回答9:

UIWindow *window = [[[UIApplication sharedApplication] delegate] window]; 
CGFloat fBottomPadding = window.safeAreaInsets.bottom;

来源：https://stackoverflow.com/questions/46829840/get-safe-area-inset-top-and-bottom-heights

标签

ios

iphone-x

safearealayoutguide