Shows the Alert when UITextField's are full or empty Swift

Question

Below is the code in that if the userNameTF or the passwordTF are full or empty it shows the alert.

@IBAction func LoginBtn(sender: AnyObject) {
    let userName = userNameTF.text
    let password = passwordTF.text    

    if ((userName?.isEmpty) != nil) {

        displayMyAlertMessage ("Forget to fill your user name")
        return        
    }

    if ((password?.isEmpty) != nil){

        displayMyAlertMessage ("Forget to fill your password")
        return    
    }        
}

func displayMyAlertMessage(userMessage:String){

    let myAlert = UIAlertController(title: "WOF", message: userMessage, preferredStyle: UIAlertControllerStyle.Alert)  
    let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil)
    myAlert.addAction(okAction)
    self.presentViewController(myAlert, animated: true, completion: nil)
 }

When checking Optional Booleans you need to deal with a 3rd possible result which is nil so add == true, == false or == nil — Leo Dabus, Apr 28 '16 at 04:37
Look at this answer as well http://stackoverflow.com/questions/29381994/swift-check-string-for-nil-empty — user3353890, Apr 28 '16 at 04:39
hi @Roberto C Dl Garza: Please Checkout my answer and accept it. — Pavan Gandhi, Apr 28 '16 at 04:48

score 3 · Answer 1 · answered Apr 28 '16 at 04:47

You can simply check your code with my code. there is minor mistake u did for checking value is empty or not.

follow below steps :

1.) Define IBOutlet for textfield

@IBOutlet var userNameTF : UITextField!
@IBOutlet var passwordTF : UITextField!

2.) Write below code on button clicked Event.

    let userName = userNameTF.text
    let password = passwordTF.text

    if (userName!.isEmpty) 
    {
        displayMyAlertMessage ("Forget to fill your user name")
        return
    }
    else if (password!.isEmpty)
    {
        displayMyAlertMessage ("Forget to fill your password")
        return
    }
    else
    {
        // Do Whatever u want.
    }

Enjoy coding...its work fine.

vadian · Accepted Answer · 2016-04-28T05:03:29.610

That's a good example to use guard

@IBAction func LoginBtn(sender: AnyObject) {

   guard let userName = userNameTF.text where !userName.isEmpty else {
        displayMyAlertMessage ("Forget to fill your user name")
        return
   }

   guard let password = passwordTF.text where !password.isEmpty else {
        displayMyAlertMessage ("Forget to fill your password")
        return
   }

    // do something with userName and password
}

Shows the Alert when UITextField's are full or empty Swift

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