ios - Facebook LoginManager 回调/PrepareforSegue Swift

Question

我正在尝试使用prepareforSegue 将属性传递给我的下一个VC。它被调用，但是我的其他 VC 不加载。

原创

@IBAction func onSignupPressed(sender: AnyObject) {
    FBSDKLoginManager().logInWithReadPermissions(permissions,
    fromViewController: self) { result, error in
    guard error == nil else { print("Login Error"); return }
    guard result.grantedPermissions.contains("email") else {
        print("No Email Permissions"); return }
    self.getFBUserData()
    dispatch_async(dispatch_get_main_queue()) {
        self.performSegueWithIdentifier("loginSegue", sender: self)
        }
    }
}

我已经能够通过调用下面的 doLogin 函数来显示下一个 VC。在那里，我从 Storyboard 中实例化一个 VC 并呈现它。我相信这是由于 Facebook 登录窗口弹出和关闭的时间造成的。我搜索了委托(delegate)方法，但没有找到任何内容

@IBAction func onSignupPressed(sender: AnyObject) {
    FBSDKLoginManager().logInWithReadPermissions(permissions,
    fromViewController: self) { result, error in
    guard error == nil else { print("Login Error"); return }
    guard result.grantedPermissions.contains("email") else {
        print("No Email Permissions"); return }
    self.getFBUserData()
    dispatch_async(dispatch_get_main_queue()) {
        self.performSegueWithIdentifier("loginSegue", sender: self)
        }
    }
}

func getFBUserData(){

    let params = "id, name, first_name, last_name, picture.type(large),friends, email, birthday, work, photos, education, location, hometown, religion, likes, about"

    if((FBSDKAccessToken.currentAccessToken()) != nil){
        FBSDKGraphRequest(graphPath: "me", parameters: ["fields":params]).startWithCompletionHandler({ (connection, result, error) -> Void in

            if (error == nil){
                //everything works print the user data
                print(result)
                let resultdict = result as? NSDictionary
                self.user = Mapper<User>().map(result)
                self.doLogin()
            }

        }) 

    }

}


func doLogin() {
        let successVC = self.storyboard?.instantiateViewControllerWithIdentifier("LoginSucessViewController")
        self.presentViewController(successVC!, animated: true, completion: nil)
          }

Answer 1

非常愚蠢的错误!没有意识到我可以简单地设置实例化 VC 的属性!

func doLogin() {

        let successVC = self.storyboard?.instantiateViewControllerWithIdentifier("LoginSucessViewController") as! LoginSucessViewController
        successVC.currentUser = user
        self.presentViewController(successVC, animated: true, completion: nil)
}