swift - Remove white spaces from var(UITextField input) doesn't work

Question

I'm new to swift, but from ObjectiveC background, I tried to get an input from textfield into a var, on a button click.

Now, when I tried to remove blank space using "stringByTrimmingCharactersInSet" and so many other options, it's not working. Here is my code,

    var someVariable = urlInputComponent.text!
    if someVariable.containsString(" "){
        someVariable = someVariable.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
        print(someVariable)

    }

I also tried by assigning the result to a new var,

        let trimmed: String = someVariable.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
        print(trimmed)

but still couldn't remove the whitespace. My guess is I'm confusing with the "Unwrapped value" concept, it'll be really helpful if someone could help me out. Thanks!

If you look at the docs, `someVariable.stringByTrimmingCharactersInSet ` returns a new string made by removing from both ends of the String characters contained in a given character set, so it's working as intended - see @Anbu's answer — sschale, Apr 28 '16 at 07:12

score 5 · Accepted Answer · answered Apr 28 '16 at 07:09

5

try the alternate way

 urlInputComponent.text! = urlInputComponent.text!.stringByReplacingOccurrencesOfString(" ", withString: "")

or else try this

let trimmed = "".join(urlInputComponent.text!.characters.map({ $0 == " " ? "" : String($0) }))
 print (trimmed)

answered Apr 28 '16 at 07:09

Anbu.Karthik

82,064
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That's fine, the first option worked. My bad, I forgot to try that. Thank you. – Rajesh S Apr 28 '16 at 07:24

score 2 · Answer 2 · answered Apr 28 '16 at 07:14

This is the code you can use to start the cleaning:

extension String {
    func condenseWhitespace() -> String {
        let components = self.componentsSeparatedByCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()).filter({!Swift.isEmpty($0)})
        return " ".join(components)
    }
}

var string = "  Lorem   \r  ipsum dolar   sit  amet. "
println(string.condenseWhitespace())

Add also this delegate method to your code:

 func textField(textField: UITextField!, shouldChangeCharactersInRange range: NSRange, replacementString string: String!) -> Bool {
       if range.location == 0 && string == " " {
           return false
       }
       return true
 }

score 2 · Answer 3 · answered Aug 02 '17 at 18:42

2

For Swift 3 you can use:

//let myTextField.text = " Hello World"

myTextField.text.replacingOccurrences(of: " ", with: "")
// Result: "Helloworld"

answered Aug 02 '17 at 18:42

gandhi Mena

2,115
1
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20

score 2 · Answer 4 · answered May 02 '18 at 00:23

2

let string = textField.text?.trimmingCharacters(in: .whitespaces)

answered May 02 '18 at 00:23

nslllava

589
2
9
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score 0 · Answer 5 · answered Apr 21 '22 at 06:41

You can do it while typing in TextFeild

 func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        if string == " " {
            textField.text = textField.text!.replacingOccurrences(of: " ", with: "")
            return false
        }
    return true
}

swift - Remove white spaces from var(UITextField input) doesn't work

5 Answers5