How to read safe area insets in SwiftUI

[onmyway133]

Declare EnvironmentKey and read safeAreaInsets from key window in connectedScenes

struct SafeAreaInsetsKey: EnvironmentKey {
    static var defaultValue: EdgeInsets {
        UIApplication.shared.keyWindow?.safeAreaInsets.swiftUIInsets ?? EdgeInsets()
    }
}

private extension UIEdgeInsets {
    var swiftUIInsets: EdgeInsets {
        EdgeInsets(top: top, leading: left, bottom: bottom, trailing: right)
    }
}

private extension UIApplication {
    var keyWindow: UIWindow? {
        connectedScenes
            .compactMap {
                $0 as? UIWindowScene
            }
            .flatMap {
                $0.windows
            }
            .first {
                $0.isKeyWindow
            }
    }
}

struct MessageBar: View {
    @Environment(\.safeAreaInsets) private var safeAreaInsets
}