Protocol that enables basic HandOff feature

HandOffable.swift

public protocol HandOffable {
    func setUpHandOff(for url: URL?)
}

extension HandOffable where Self: UIViewController {
    public func setUpHandOff(for url: URL?) {
        guard let url = url else { return }
        guard let activtiyType = Bundle.main.bundleIdentifier else { return }
        userActivity = NSUserActivity(activityType: activtiyType)
        userActivity?.isEligibleForHandoff = true
        userActivity?.webpageURL = url
        userActivity?.becomeCurrent()
    }
}