React Native：向iOS应用添加键盘快捷键

Question

所以我试图在我的React Native iOS应用中添加键盘快捷键。这样，用户可以在iPad上使用外部键盘来利用这些快捷方式。

我已经创建了一个AppDelegate.swift和RootViewController.swift以仅在我的React Native应用程序中与swift一起使用。到目前为止，我的基本应用程序正在运行。它还可以使用添加到RootViewController的KeyCommands的代码进行编译，但是在按cmd + s时不会触发操作，或者在iPad上按住cmd键时不会显示可用命令。

AppDelegate.swift

import Foundation

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

 var window: UIWindow?

 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions [UIApplication.LaunchOptionsKey: Any]?) -> Bool {


   var rootView: RootViewController = RootViewController()

   self.window = UIWindow(frame: UIScreen.main.bounds)
   var rootViewController = UIViewController()

   rootViewController = rootView

   self.window!.rootViewController = rootViewController;
   self.window!.makeKeyAndVisible()

  return true
 }
}

RootViewController.swift

import Foundation
import UIKit


class RootViewController: UIViewController {

  var bridge: RCTBridge!

  override func viewDidLoad() {
    super.viewDidLoad()

    let jsCodeLocation = NSURL(string: "http://localhost:8081/index.bundle?platform=ios&dev=true")

    let rootView = RCTRootView(bundleURL:jsCodeLocation as URL!, moduleName: "tinyWhaleApp", initialProperties: nil)

    self.bridge = rootView?.bridge

    self.view = rootView

  }


  override func becomeFirstResponder() -> Bool {
    return true
  }

  override var keyCommands: [UIKeyCommand]? {
    return [
      UIKeyCommand(input: "s", modifierFlags: [.command], action: "saveFile:", discoverabilityTitle: "Save"),
    ]
  }

  func saveFile(sender: UIKeyCommand) {
    print("saving file")
  }
}

如果有人可以帮助我使用外接键盘在iPad上使用键盘快捷键，那就太好了。