[ios] Detect if the device is iPhone X

After looking at all the answers this is what I ended up doing:

Solution (Swift 4.1 compatible)

extension UIDevice {
    static var isIphoneX: Bool {
        var modelIdentifier = ""
        if isSimulator {
            modelIdentifier = ProcessInfo.processInfo.environment["SIMULATOR_MODEL_IDENTIFIER"] ?? ""
        } else {
            var size = 0
            sysctlbyname("hw.machine", nil, &size, nil, 0)
            var machine = [CChar](repeating: 0, count: size)
            sysctlbyname("hw.machine", &machine, &size, nil, 0)
            modelIdentifier = String(cString: machine)
        }

        return modelIdentifier == "iPhone10,3" || modelIdentifier == "iPhone10,6"
    }

    static var isSimulator: Bool {
        return TARGET_OS_SIMULATOR != 0
    }
}

Use

if UIDevice.isIphoneX {
    // is iPhoneX
} else {
    // is not iPhoneX
}

Note

Pre Swift 4.1 you can check if the app is running on a simulator like so:

TARGET_OS_SIMULATOR != 0

From Swift 4.1 and onwards you can check if the app is running on a simulator using the Target environment platform condition:

#if targetEnvironment(simulator)
    return true
#else
    return false
#endif

(the older method will still work, but this new method is more future proof)

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