enum

Using enum.swift

enum ShortcutIdentifier: String {
    case Start
    case Stop
    case Share
    
    init?(fullType: String) {
        guard let last = fullType.components(separatedBy: ".").last else { return nil }
        self.init(rawValue: last)
    }
    var type: String {
        return Bundle.main.bundleIdentifier! + ".\(self.rawValue)"
    }
}

class MainViewController: UIViewController {
    var shortcutItem: UIApplicationShortcutItem?

    override func viewDidAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.neighborPickerView.reloadAllComponents()
        let selectedShortcutItem = shortcutItem
        if selectedShortcutItem != nil {
            switch (selectedShortcutItem) {
            case ShortcutIdentifier.Start.type:
Error:(119, 43) expression pattern of type 'String' cannot match values of type 'UIApplicationShortcutItem?'