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我有一个注册过程，我有一个登录/注册Facebook（连接到分析）的入口点。如果用户从未注册过他们的Facebook帐户，那么他们将被发送到用户注册用户名，电子邮件和密码的发送页面。我有一个功能设置，如果用户将任何文本字段留空以供用户注册，则会显示警告消息，并显示错误消息，指出该字段为空。此功能正常工作，但当单击“确定”关闭消息时，注册视图控制器将自行关闭，并显示入口点（登录屏幕）视图控制器。这不应该发生，我没有从登记屏幕登录屏幕的segue设置。有什么想法吗？Swift - 关闭警报消息关闭视图控制器
弹出给我的一件事是控制台日志中的错误，我相信它实际上与Parse if/else语句相关联，而不是与字段== nil语句相关联。
控制台登录：
2015-04-14 10:42:56.293 tappery[574:142525] [Error]: missing username (Code: 200, Version: 1.6.3)
登录屏幕视图控制器：
import UIKit
class LoginViewController: UIViewController {
@IBOutlet var loginCancelledLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
var currentUser = PFUser.currentUser()
if currentUser != nil {
println("User is Logged in")
} else {
println("User is not logged in")
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func facebookLoginButton(sender: AnyObject) {
var permissions = ["public_profile", "email", "user_friends"]
self.loginCancelledLabel.alpha = 0
PFFacebookUtils.logInWithPermissions(permissions, {
(user: PFUser!, error: NSError!) -> Void in
if let user = user {
if user.isNew {
println("User signed up and logged in through Facebook!")
self.performSegueWithIdentifier("registerUser", sender: self)
} else {
println("User logged in through Facebook!")
self.performSegueWithIdentifier("loginSuccessful", sender: self)
}
} else {
println("Uh oh. The user cancelled the Facebook login.")
self.loginCancelledLabel.alpha = 1
}
})
}
}
注册视图控制器：
import UIKit
class UserRegistrationViewController: UIViewController {
func displayAlert(title:String, error:String) {
var alert = UIAlertController(title: title, message: error, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: {
action in
self.dismissViewControllerAnimated(true, completion: nil)
}))
self.presentViewController(alert, animated: true, completion: nil)
}
@IBOutlet var usernameTextField: UITextField!
@IBOutlet var emailTextField: UITextField!
@IBOutlet var passwordTextField: 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 registerUser(sender: AnyObject) {
var error = ""
if usernameTextField.text == nil || emailTextField.text == nil || passwordTextField.text == nil {
error = "Please enter a username, email and password"
}
if error != "" {
displayAlert("Error In Form", error: error)
} else {
var user = PFUser.currentUser()
user.username = usernameTextField.text
user.password = passwordTextField.text
user.email = emailTextField.text
user.saveInBackgroundWithBlock {
(succeeded: Bool!, signupError: NSError!) -> Void in
if signupError == nil {
println(user.username)
println(user.password)
println(user.email)
self.performSegueWithIdentifier("successfulRegistration", sender: self)
// Hooray! Let them use the app now.
} else {
if let errorString = signupError.userInfo?["error"] as? NSString {
error = errorString
} else {
error = "Please try again later."
}
self.displayAlert("Could Not Sign Up", error: error)
}
}
}
}