How can i make a function for a certain textfield?

Question

This code allows the users to type in certain characters only:

let allowedChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-.";

func textField(

    textField: UITextField,

    shouldChangeCharactersInRange range: NSRange,

                                  replacementString string: String)

    -> Bool

{

    let set = NSCharacterSet(charactersInString: allowedChars);



    let filtered = string

        .componentsSeparatedByCharactersInSet(set)

        .joinWithSeparator("");

    return filtered != string;



}

How can i make it so that it allows a just one textfield called "txtField1"?

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Answer 1

Assign a value to the tag on your textfield that is unique to it (for example, 1).

txtField1.tag = 1

Then, update your method like this:

func textField(
    textField: UITextField,
    shouldChangeCharactersInRange range: NSRange,
                                  replacementString string: String)
    -> Bool
{
    if textField.tag == 1 {
        let set = NSCharacterSet(charactersInString: allowedChars)

        let filtered = string
            .componentsSeparatedByCharactersInSet(set)
            .joinWithSeparator("")
        return filtered != string
    }

    return true
}

You can also omit the ; in Swift.

How can i make a function for a certain textfield?

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