无法从 didFinishLaunchingWithOptions 函数获取 launchOptions 数据

Question

我的应用需要从 Remotenotification 获取一些数据，以便像 FACEBOOK 应用一样将第一页推送到特定页面，但现在我无法从它始终显示的 didFinishLaunchingWithOptions 函数获取 launchOptions 数据：

Cannot invoke 'objectForKey' with an argument list of type '(String)'.

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

    let userNotificationTypes = (UIUserNotificationType.Alert | UIUserNotificationType.Badge | UIUserNotificationType.Sound)

    // Register for Push Notitications, if running iOS 8
    if application.respondsToSelector("registerUserNotificationSettings:") {
        let settings:UIUserNotificationSettings = UIUserNotificationSettings(forTypes: userNotificationTypes, categories: nil)
        application.registerUserNotificationSettings(settings)
        application.registerForRemoteNotifications()

    } else {
        // Register for Push Notifications before iOS 8
        application.registerForRemoteNotificationTypes( UIRemoteNotificationType.Badge | UIRemoteNotificationType.Sound | UIRemoteNotificationType.Alert )
    }

    if let launchOpts = launchOptions {
        var notificationPayload: NSDictionary = launchOptions.objectForKey(UIApplicationLaunchOptionsRemoteNotificationKey) as NSDictionary
        //Cannot invoke 'objectForKey' with an argument list of type '(String)'.
    }

    return true
}

Answer 1

试试下面的方法：

if let notification = launchOpts[UIApplicationLaunchOptionsRemoteNotificationKey] as? [NSObject : AnyObject] {

    // extra work           
}