UIDevice+SizeModel.swift

public extension UIDevice {
    /// This enum gives us simple way how to recognize which UIDevice size
    ///
    /// For the resolutions, refer to
    /// Apple official website:
    /// https://developer.apple.com/library/archive/documentation/DeviceInformation/Reference/iOSDeviceCompatibility/Displays/Displays.html
    /// Because the documentation is missing, I ran simulators and manually checked some resolutions on
    /// `UIScreen.main.bounds` (for Xr, XS Max and 11-inch iPhones) Apple somehow doesn't update the documentation.
    enum DeviceSize: CaseIterable {
        // iPhones:

        case iPhoneX // XS
        case iPhoneXSMax // Fun fact: Xr has same logical resolution as XS Max.
                         // https://stackoverflow.com/a/52425261/5774854
        case iPhone8Plus // Since iPhone 6+, this works for all of our screens
        case iPhone8 // Since iPhone 6, this works for all of our screens
        case iPhoneSE // iPhone 5, 5S... SE 2 maybe? 🚀
        case iPhone4 // 4S

        // iPads:
        case iPadAir // Also known as: iPad 3, iPad 4, iPad Air, iPad Air 2, 9.7-inch iPad Pro
                    // iPad Minis have same logical resolutions, but are different in PPI (higher) and physical display.
                    // I expect them to behave the same in same logical resolutions.
        case iPadPro10AndHalfInch
        case iPadPro11Inch
        case iPadPro12Point9Inch

        var size: CGSize {
            switch self {
            // iPhones
            case .iPhoneX:
                return .init(width: 375, height: 812)
            case .iPhoneXSMax:
                return .init(width: 414, height: 896)
            case .iPhone8Plus:
                return .init(width: 414, height: 736)
            case .iPhone8:
                return .init(width: 375, height: 667)
            case .iPhoneSE:
                return .init(width: 320, height: 568)
            case .iPhone4:
                return .init(width: 320, height: 480)
            // iPads:
            case .iPadAir:
                return .init(width: 768, height: 1024)
            case .iPadPro10AndHalfInch:
                return .init(width: 834, height: 1112)
            case .iPadPro11Inch:
                return .init(width: 834, height: 1194)
            case .iPadPro12Point9Inch:
                return .init(width: 1024, height: 1366)
            }
        }
    }

    // Probable iPhone/iPad model acording to size. Because we want to make different screen designs
    // according to device sizes, it is more than appropriate to finaly differ the screen resolutions.
    var sizeModel: DeviceSize {

        guard let size = DeviceSize.allCases.first(where: { $0.size == UIScreen.main.bounds.size }) else {
            fatalError("Size detected from this enum was not found. Either some 👽 device or the device is new and was not added.")
        }
        return size
    }
}