A Swift type suitable for creating keys that belongs to a specific bundle.
Application keys have the form bundleIdentifier.key.
If a bundle's identifier is nil, then an application key is created from the given key with the form key. If the given key is an empty string, then the application key is created from the bundle identifier with the form bundleIdentifier.
DispatchQueue(label: ApplicationKey(from: "processingQueue")).async {
}
UserDefaults.standard.set(true, forKey: ApplicationKey(from: "showWarning"))
let key = ApplicationKey(from: "aKey", in: Bundle(identifier: "aBundleIdentifier"))