AppDelegate中对成员“下标”的不明确引用

Question

我正在将我的Swift代码从版本2迁移到3。在AppDelegate.swift中，我实现了以下方法：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject : AnyObject]?) -> Bool {

    FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)

    // error below this line
    if let notification = launchOptions?[UIApplicationLaunchOptionsKey.remoteNotification] as? [NSObject : AnyObject] {
    } else {}
    return true
}

我收到以下错误：

成员“下标”含糊不清

我该如何解决这个问题？

Answer 1

遵循@Larme的建议，我通过将方法签名更改为来解决了这个问题：

func application(_ application: UIApplication,
                          didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool {

    FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)

// error below this line
    if let notification = launchOptions?[UIApplicationLaunchOptionsKey.remoteNotification] as? [NSObject : AnyObject] {
    } else {}
    return true
}