SafeAreaInsets.swift

import SwiftUI
import UIKit

var hasTopNotch: Bool {
    if #available(iOS 11.0,  *) {
        // with notch: 44.0 on iPhone X, XS, XS Max, XR.
        // without notch: 24.0 on iPad Pro 12.9" 3rd generation, 20.0 on iPhone 8 on iOS 12+.
        return UIApplication.shared.windows.filter {$0.isKeyWindow}.first?.safeAreaInsets.top ?? 0 > 24
    } else{
        return UIApplication.shared.delegate?.window??.safeAreaInsets.top ?? 0 > 24
    }
}
let top: CGFloat = hasTopNotch ? 44 : 24

var hasBottomSafeAreaInsets: Bool {
    if #available(iOS 11.0, *) {
        // with home indicator: 34.0 on iPhone X, XS, XS Max, XR.
        // with home indicator: 20.0 on iPad Pro 12.9" 3rd generation.
        return UIApplication.shared.windows.filter {$0.isKeyWindow}.first?.safeAreaInsets.bottom ?? 0 > 0
    } else {
        return UIApplication.shared.delegate?.window??.safeAreaInsets.bottom ?? 0 > 0
    }
}
let bottom: CGFloat = hasBottomSafeAreaInsets ? 34 : 0