How to call a constant from a func in another func

Question

I'm new in swift and have a question 😊.

I made a UITextField in a func programmatically and I want to call it in another func like:

func alertForEmptyField {
    if textfield == nill { 
        ...
    }
}

But I can't call my textfield of course because it is in another func , but my silly question is how can I call it ?

I don't want to make my constants in viewDidLoad because those are more than 20 constants for that reason I made them separately in separate func .

Thank you so much.

Answer 1

You need to read up on the concept of scope. The Apple Swift iBook covers this quite well. I suggest reading the first few chapters of that book to get a better grounding. (You will struggle until you get this concept, so it's worth spending as much time as it takes to get it before moving on.)

If you define a variable or let constant inside a function, it is a local variable, and it ceases to exist when you exit the function. If that variable/constant contains an object, and that's the only reference to that object, it will get deallocated once the function returns. You need to move your variables/constants outside of your functions (and probably make them instance variables) if you want them to be accessible from other instance methods in your class.

Answer 2

You shouldn't do that. If you need to access variable you should return it. Then you can assign it to variable, constant or property.