swift - 如果数据库中存在匿名用户，则转至主屏幕

Question

我正在使用PFAnonymousUtils和PFUser.enableAutomaticUser。我想检查用户是否存在是数据库，如果是的话我想转向 DiscoverViewController。

问题是，即使没有用户，应用程序也会继续转发到 DiscoverVc...

    let currentUser = PFUser.currentUser()

    if currentUser != nil {

        let storyboard = UIStoryboard(name: "Main", bundle: nil)

        // instantiate your desired ViewController
        let rootController = storyboard.instantiateViewControllerWithIdentifier("DiscoverVc")

        // Because self.window is an optional you should check it's value first and assign your rootViewController
        if self.window != nil {
            self.window!.rootViewController = rootController
        }

    } else {

        let installation = (PFInstallation.currentInstallation())
        installation["User"] = PFUser.currentUser()
        installation.saveInBackground()

        PFAnonymousUtils.logInWithBlock {
            (user: PFUser?, error: NSError?) -> Void in
            if error != nil || user == nil {

                print("Anonymous user failed")

            } else {

                print("Anonymous user logged in.")
            }

        }
    }

Answer 1

来自解析文档:

PFUser.enableAutomaticUser

After calling this method, currentUser will always have a value. The user will only be created on the server once the user has been saved, or once an object with a relation to that user or an ACL that refers to the user has been saved.

要检查用户是否是匿名用户，请使用:

PFAnonymousUtils.isLinkedWithUser(PFUser.currentUser())

Return Value YES if the user is anonymous. NO if the user is not the current user or is not anonymous.