ios - 成功登录时解析切换 View Controller

Question

用户成功登录后，我需要将 View Controller 切换到我的应用程序的时间轴部分，这也将是一个底部有 5 个不同选项卡的选项卡栏 View Controller 。这是我到目前为止的代码，它可以工作并连接到我设置的解析数据库。 导入 UIKit 导入解析

class LoginViewController: UIViewController {

@IBOutlet var usernameField: UITextField!
@IBOutlet var passwordField: UITextField!

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
@IBAction func loginTapped(sender: AnyObject) {

    let username = usernameField.text
    let password = passwordField.text

    PFUser.logInWithUsernameInBackground(username, password:password) {
        (user: PFUser?, error: NSError?) -> Void in
        if user != nil {
            println("Success")
        } else {
            var loginError:UIAlertView = UIAlertView(title: "Invalid Login", message: "I did not recognize your credentials. Try again?", delegate: self, cancelButtonTitle: "Dismiss")
            loginError.show()
        }
    }
}

@IBAction func closeTapped(sender: AnyObject) {
    dismissViewControllerAnimated(true, completion: nil)
}
}

在 println("sucessful") 行中，我需要切换到他们的时间轴主页(标签栏 View Controller )，而不是打印出成功的登录。

Answer 1

如果登录成功，使用 segue 转换到新的 View Controller :

if user != nil {
  self.performSegueWithIdentifier("successfulLoginPage", sender: self)