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iOS

Posted by Alexander Certosimo
Alexander Certosimo
1,774 Points

stuck on a piece of code to check empty text field

hey all,

I am trying to implement a check to see if a text field is empty, but i am having no luck. Basically what is happening is i can add an empty string to my table view, and i do not want that so i tried to avoid that from happening with this:

@IBAction func addItem(sender: AnyObject) {

        if taskInput.text != nil {

        taskList.append((taskInput.text!))
        taskInput.text = ""


        NSUserDefaults.standardUserDefaults().setObject(taskList, forKey: "taskList")

        }else{
            print("no")
        }
    }
Jhoan Arango
Jhoan Arango
14,575 Points

Hello :

If you can explain a bit better I may be able to help you with this. But I am not understanding what you want to do at the end.

  • What do you want to do with the empty string ?
  • What if it's empty ?
  • Do you want it to be empty?
  • What is the purpose of the code ?
Alexander Certosimo
Alexander Certosimo
1,774 Points

hey Jhoan ,

Thanks for the reply! So what i am doing here is using a button to take a user inputted string from UItextfield (taskInput) to then add that string to the array named taskList. The empty string is there to reset the Uitextfield back to nothing so the user inputted text disappears. The else statement was just for testing to see if the code worked. My main goal is to avoid an empty Uitextfield from being submitted to the array, which is then input into the tableview. I want the button to not allow just white space to be submitted

1 Answer

Jhoan Arango
Jhoan Arango
14,575 Points
Jhoan Arango
Jhoan Arango
14,575 Points

Got it.. How about if you declare a constant and append it to the array..? 

@IBAction func addItem(sender: AnyObject) {

        if taskInput.text != nil {

        let thisConstant = taskInput.text

        taskList.append(thisConstant)
        taskInput.text = ""


        NSUserDefaults.standardUserDefaults().setObject(taskList, forKey: "taskList")

        }else{
            print("no")
        }
    }

Let me know if that works.. if not I will get in Xcode and help you out.

Alexander Certosimo
Alexander Certosimo
1,774 Points

hey Jhoan

So i tried that out and had not luck. The if statement still wont work. If i hit my button with nothing in the uitextfield, it does not print "no" to the console and still submits the empty space to my table view. I am pretty stuck with this.

Jhoan Arango
Jhoan Arango
14,575 Points

Hello Alex, Good news :)

It's a very very simple fix.

Instead of using nil, use "". 

if taskInput.text != "" {
// actions
}

So if the text field is empty then it will not execute your action and will print the else action.

Please let me know if that works

Alexander Certosimo
Alexander Certosimo
1,774 Points

Jhoan

Thank you so much! that simple fix worked! I was stuck on this for so long. Would this same approach work for a uitextview as well?

Jhoan Arango
Jhoan Arango
14,575 Points

I don't see why not.

Glad it worked, if you encounter anything else let me know..

Good luck

Alexander Certosimo
Alexander Certosimo
1,774 Points

Thanks Jhoan. I have a question related to this i figured i would ask you. With this project i am working on, i am setting up a table view with 4 sections. I am creating custom cells that have a uitextview in each of them along with a button so that the user can add, edit, and delete their data easily (it seemed like the best solution). The data for each section is going to come from a different array. How do i specify cells in each different section to get the data from the different arrays? Can i make a seperate cellForRowAtIndexPath function for each section?

The overview of what i am trying to do is have a user input questions that would be stored in an array, and have the tableview be the area that the user can do all the adding and deleting of their questions within the uitextview.