CODEWITHSUNDEEP
iosswiftuitextfield
Luis F Ramirez
Luis F Ramirez

Reputation: 168

Allow Backspace with character set

I am having trouble deleting in my text field. So I have a text field for a person name only allowing letters. But when I hit the delete or backspace it doesn't seem to work. This is what my code looks like.

 func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    let set = CharacterSet.letter
    return (string.rangeOfCharacter(from: set) != nil)
}

I am not sure why the backspace/delete is not working.

Upvotes: 4

Views: 1358

Answers (2)

Tejasvi
Tejasvi

Reputation: 29

When you tap the backspace check for backspace code and return false if rangeOfCharacter for your regular expression is nil else return true.

Try this:

        let  char = text.cString(using: String.Encoding.utf8)!
        let isBackSpace = strcmp(char, "\\b")
        if (isBackSpace == -92) {
        }else if text.range(of: kRangeWithoutSpace, options:.regularExpression) == nil {
           return false
        }

Upvotes: 0

rmaddy
rmaddy

Reputation: 318794

When the user taps the backspace, string will be the empty string. So rangeOfCharacter will be nil so your code returns false preventing the backspace from working.

Try this:

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    return string.isEmpty || string.rangeOfCharacter(from: CharacterSet.letter) != nil
}

Upvotes: 8

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