为什么对成员 'Subscript' 的引用不明确？

Question

这是我的Swift3代码：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    if let userInfo : Foundation.NSDictionary = launchOptions?[UIApplicationLaunchOptionsKey.remoteNotification] as? Foundation.NSDictionary {
        self.setNavigationInfoFromPushNotification(userInfo: userInfo)
        navigateFromPushNotification()
    }
    ...
}

它会导致编译时错误：

Ambiguous reference to member 'Subscript'

谁能帮我解决这个问题？

Answer 1

方法签名已更改。参见 。

现在是：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool { 
    if let userInfo = launchOptions?[.remoteNotification] as? NSDictionary {
        setNavigationInfoFromPushNotification(userInfo: userInfo)
        navigateFromPushNotification()
    }
    ...
}