swift - PFUser() 和处理密码成员

Question

对于一个很长的问题，我深表歉意。大部分代码都是多余的。请看一下!!!

起初，我认为指定的信息是在 else 部分发送的，正如 Parse 文档所示，https://parse.com/docs/ios/guide#users :

func myMethod() {
  var user = PFUser()
  user.username = "myUsername"
  user.password = "myPassword"
  user.email = "email@example.com"
  // other fields can be set just like with PFObject
  user["phone"] = "415-392-0202"

  user.signUpInBackgroundWithBlock {
    (succeeded: Bool, error: NSError?) -> Void in
    if let error = error {
      let errorString = error.userInfo?["error"] as? NSString
      // Show the errorString somewhere and let the user try again.
    } else {
      // Hooray! Let them use the app now.
    }
  }
}

请注意，“万岁!现在就让他们使用该应用程序吧。”所以我想只要控制流没有到达else{}，指定的信息就不会发送到云端。但是我错了。经过多次尝试和错误，这是我得出的结论。如果 error 等于 nil，signUpInBackgroundWithBlock 会发送必要的信息。如果我错了，请纠正我。这就是原因。只要username成员是唯一的并且采用“something@something.com”的形式，signUpInBackgroundWithBlock就会将指定的信息发送到云端，甚至如果，则其他字段为空。

以下代码相当多余，对此我深表歉意。只需忽略所有 alertController 代码即可。

import UIKit
import Parse

class SignUpViewController: UIViewController {

    @IBOutlet weak var firstName: UITextField!
    @IBOutlet weak var lastName: UITextField!
    @IBOutlet weak var emailAddress: UITextField!
    @IBOutlet weak var password: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        firstName.becomeFirstResponder()
    }

    @IBAction func signUp(sender: AnyObject) {
        let user = PFUser()
        user["firstName"] = firstName.text
        user["lastName"] = lastName.text
        user.email = emailAddress.text
        user.password = password.text
        user.username = emailAddress.text

        user.signUpInBackgroundWithBlock { (succeeded: Bool, error: NSError?) -> Void in
            if self.firstName.text == "" {
                let alertController = UIAlertController(title: "", message: "please enter your first name", preferredStyle: UIAlertControllerStyle.Alert)
                alertController.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
                    //println("Handle Ok logic here")
                }))
                self.presentViewController(alertController, animated: true, completion: nil)
            } else if self.lastName.text == "" {
                let alertController = UIAlertController(title: "", message: "please enter your last name", preferredStyle: UIAlertControllerStyle.Alert)
                alertController.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
                    //println("Handle Ok logic here")
                }))
                self.presentViewController(alertController, animated: true, completion: nil)
            } else if self.emailAddress.text == "" {
                let alertController = UIAlertController(title: "", message: "please enter your email", preferredStyle: UIAlertControllerStyle.Alert)
                alertController.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
                    //println("Handle Ok logic here")
                }))
                self.presentViewController(alertController, animated: true, completion: nil)
            } else if self.password.text == "" {
                let alertController = UIAlertController(title: "", message: "please enter a password", preferredStyle: UIAlertControllerStyle.Alert)
                alertController.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
                    //println("Handle Ok logic here")
                }))
                self.presentViewController(alertController, animated: true, completion: nil)
            } else if let error = error {
                var errorString = error.userInfo?["error"] as? NSString
                errorString = String(errorString!)

                if (errorString?.rangeOfString("missing username").toRange() != nil) {
                    errorString = "missing email address"
                }

                if (errorString?.rangeOfString("username \(self.emailAddress.text) already taken").toRange() != nil) {
                    errorString = "email \(self.emailAddress.text) already taken"
                }

                let alertController = UIAlertController(title: "", message: "\(errorString!)", preferredStyle: UIAlertControllerStyle.Alert)
                alertController.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
                    //println("Handle Ok logic here")
                }))
                self.presentViewController(alertController, animated: true, completion: nil)
            } else {
                println("SDFJPOIWEJRPOIJWEPOITPOEWIJRPOWIEJRPIWOJEPTIHWEPROIJWPEROIJ")
            }
        }
    }
}

此外，有趣的是，如果 password 成员为空，Parse 似乎应该生成 错误，因为它是 PFUser() 的一部分> 当用户名为空时，会生成错误。但事实似乎并非如此。

所以底线是:如果其他字段为空，我不希望 signUpInBackgroundWithBlock 将指定信息发送到云。我不知道该怎么做。有人有解决这个问题的建议吗？

Answer 1

您只需将验证代码移至 User.signUpInBackgroundWithBlock 回调之外即可:

@IBAction func signUp(sender: AnyObject) {
    let user = PFUser()
    user["firstName"] = firstName.text
    user["lastName"] = lastName.text
    user.email = emailAddress.text
    user.password = password.text
    user.username = emailAddress.text

    if firstName.text == "" {
        let alertController = UIAlertController(title: "", message: "please enter your first name", preferredStyle: UIAlertControllerStyle.Alert)
        alertController.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
            //println("Handle Ok logic here")
        }))
        presentViewController(alertController, animated: true, completion: nil)
    } else if lastName.text == "" {
        let alertController = UIAlertController(title: "", message: "please enter your last name", preferredStyle: UIAlertControllerStyle.Alert)
        alertController.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
            //println("Handle Ok logic here")
        }))
        presentViewController(alertController, animated: true, completion: nil)
    } else if emailAddress.text == "" {
        let alertController = UIAlertController(title: "", message: "please enter your email", preferredStyle: UIAlertControllerStyle.Alert)
        alertController.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
            //println("Handle Ok logic here")
        }))
        presentViewController(alertController, animated: true, completion: nil)
    } else if password.text == "" {
        let alertController = UIAlertController(title: "", message: "please enter a password", preferredStyle: UIAlertControllerStyle.Alert)
        alertController.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
            //println("Handle Ok logic here")
        }))
        presentViewController(alertController, animated: true, completion: nil)
    } else {
        user.signUpInBackgroundWithBlock { (succeeded: Bool, error: NSError?) -> Void in
            if let error = error {
                var errorString = error.userInfo?["error"] as? NSString
                errorString = String(errorString!)

                if (errorString?.rangeOfString("missing username").toRange() != nil) {
                    errorString = "missing email address"
                }

                if (errorString?.rangeOfString("username \(self.emailAddress.text) already taken").toRange() != nil) {
                    errorString = "email \(self.emailAddress.text) already taken"
                }

                let alertController = UIAlertController(title: "", message: "\(errorString!)", preferredStyle: UIAlertControllerStyle.Alert)
                alertController.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
                    //println("Handle Ok logic here")
                }))
                self.presentViewController(alertController, animated: true, completion: nil)
            } else {
                println("SDFJPOIWEJRPOIJWEPOITPOEWIJRPOWIEJRPIWOJEPTIHWEPROIJWPEROIJ")
            }
        }
    }
}