Device

Code

UIDevice.current.userInterfaceIdiom == .pad
UIDevice.current.userInterfaceIdiom == .phone
UIDevice.current.userInterfaceIdiom == .unspecified

Model

public extension UIDevice {
    static let modelName: String = {
        var systemInfo = utsname()
        uname(&systemInfo)
        let machineMirror = Mirror(reflecting: systemInfo.machine)
        let identifier = machineMirror.children.reduce("") { identifier, element in
            guard let value = element.value as? Int8, value != 0 else { return identifier }
            return identifier + String(UnicodeScalar(UInt8(value)))
    }
}

1. POSIX defines struct utsname as the structure returned by the uname function. The uname function returns information about the current system.

   The identifier systemInfo is just a variable name. It has no special meaning.

2. The “need to convert” exists because utsname.machine contains a string intended for programs, programmers and technicians, not end users. There have been multiple hardware versions of certain devices, like the iPhone 5S. Apple calls all of them “iPhone 5S” when speaking to users. Internally, you can tell which hardware version you're on by looking at the utsname.machine string. If you want to refer to the user's device by its user-friendly name, you need to convert from the utsname.machine string to the user-friendly name.

References

SO | detect-current-device-with-ui-user-interface-idiom-in-swift

apple dev | uikit/uidevices

apple doc official