在 swift 4 中正确显示所有文本字段是否完整？

Question

我正在创建一个电子邮件输入和一个姓名输入，我需要在所有字段都完成后显示一条消息。但出于某种原因，当存在空白字段并且用户单击提交按钮时，将显示成功消息。有没有办法在所有字段完成后放入一个子句或其他东西来触发它？谢谢您的帮助。

这是我的代码：

import UIKit
import MessageUI

class RequestFilterVC: UIViewController {

    @IBOutlet weak var emailTxtField: UITextField!
    @IBOutlet weak var filterTxtField: UITextField!
    @IBOutlet weak var requestBtn: UIButton!        
    @IBOutlet weak var validatorMessage: UILabel!        
    @IBOutlet weak var requestedMessage: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        // hide validator message
        validatorMessage.isHidden = true            
        requestedMessage.isHidden = true
    }

    @IBAction func requestBtnWasTapped(_ sender: Any) {

        let providedEmailAddress = emailTxtField.text

        let isEmailAddressValid = isValidEmailAddress(emailAddressString: providedEmailAddress!)

        if isEmailAddressValid
        {
            print("Email address is valid")
        } else {
            print("Email address is not valid")
            displayAlertMessage(messageToDisplay: "Email address is not valid")
        }

        // If All are completed then send the email .
        let composeVC = MFMailComposeViewController()
        composeVC.mailComposeDelegate = self as? MFMailComposeViewControllerDelegate

        // Configure the fields of the interface.
        composeVC.setToRecipients(["myemail@awesomeemail.com])
        composeVC.setSubject("Form Submit)
        composeVC.setMessageBody("\(emailTxtField, filterTxtField)", isHTML: false)

        // Present the view controller modally
        //  self.present(composeVC, animated: true, completion: nil)
        requestedMessage.isHidden = false
        requestedMessage.text = "Submitted form . thank you"            
   }

    func isValidEmailAddress(emailAddressString: String) -> Bool {

        var returnValue = true
        let emailRegEx = "[A-Z0-9a-z.-_]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,3}"

        do {
            let regex = try NSRegularExpression(pattern: emailRegEx)
            let nsString = emailAddressString as NSString
            let results = regex.matches(in: emailAddressString, range: NSRange(location: 0, length: nsString.length))

            if results.count == 0
            {
                returnValue = false
            }                
        } catch let error as NSError {
            print("invalid regex: \(error.localizedDescription)")
            returnValue = false
        }

        return  returnValue
    }        

    func displayAlertMessage(messageToDisplay: String)
    {
        let alertController = UIAlertController(title: "Error", message: messageToDisplay, preferredStyle: .alert)

        let OKAction = UIAlertAction(title: "OK", style: .default) { (action:UIAlertAction!) in

            print("Ok button tapped");                
        }

        alertController.addAction(OKAction)

        self.present(alertController, animated: true, completion:nil)
    }    
}

Answer 1

使用正则表达式创建委托听起来怎么样？每次你按下一个键调用委托，如果它与正则表达式匹配，你可以取消隐藏 UILabel ......这样的事情可以工作。

Answer 2

改变

displayAlertMessage(messageToDisplay: "Email address is not valid")

至

displayAlertMessage(messageToDisplay: "Email address is not valid")
return

Answer 3

如果第二个文本字段为空或不在任何地方，您就不会检查ing。（我不知道为什么你将一个应该存储名称的文本字段命名为 filterTextField ）

if isEmailAddressValid && !filterTextField.text?.isEmpty {
    print("Email address is valid")
} else {
    print("Email address is not valid")
    displayAlertMessage(messageToDisplay: "Email address is not valid")
    return
}

Answer 4

对于您的问题，以下更改将处理错误验证电子邮件后，您不会返回或中断流程，它将执行您函数中剩下的剩余代码。所以你需要停止执行。

if isEmailAddressValid
        {
            print("Email address is valid")
        } else {
            print("Email address is not valid")
            displayAlertMessage(messageToDisplay: "Email address is not valid")
        }

How ever for better approach, I would suggest to disable the submit button until the text field has value.

func textFieldDidBeginEditing(textField: UITextField!) {    //delegate method
   //check for the required text field  
   if (emailTxtField.text!.isEmpty){
      //disable submit button
    }
   else{
     // enable the submit button
     }
}

func textFieldShouldEndEditing(textField: UITextField!) -> Bool {  //delegate method
   if (emailTxtField.text!.isEmpty){
      //disable submit button
    }
   else{
     // enable the submit button
     }
    return true
}

在 swift 4 中正确显示所有文本字段是否完整？

Show message if all textfields are complete, correctly in swift 4?

uitextfield

ios

swift