ios - 为什么对成员“下标”的引用模棱两可？

Question

这是我的 Swift 3 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，提示：

对成员“下标”的模糊引用

请问有人可以帮我吗？

Answer 1

方法签名已更改。请参阅点击通知时如何处理 Swift 3 中的启动选项？遇到语法问题。

就是现在：

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