Paste (Insert) into Label (IOS) only the numbers of String

Question

I have code to implement the "Paste" function.

But there is an insertion of all symbols and not only numbers.

How can I make it so that I can insert only numbers ???

Creating an Extension file:

Updated code

actionSheetController.addAction(
        UIAlertAction(title: NSLocalizedString("Past", comment: ""), style: .default, handler: { [weak self] _ in
            guard let strongSelf = self else { return }

            strongSelf.displayResultLabel.text = UIPasteboard.general.string.onlyNumbers()

            print ("Past")

        })
    )



extension String {

    func onlyNumbers() ->String{
        do{
            let regex = try NSRegularExpression(pattern: "([//.,\\d])*", options:[.dotMatchesLineSeparators])
            var result : String = ""

            for resultMatch in regex.matches(in: self, options: NSRegularExpression.MatchingOptions.init(rawValue: 0), range: NSMakeRange(0, NSString(string: self).length)) {
                result += NSString(string: self).substring(with: resultMatch.range)
            }
            return result
        }
        catch
        {

        }

        return ""
    }

}

Convert the string to a number and back OR use NSCharacterSet and extract the numbers from the string. — Brandon, Aug 28 '17 at 13:50

Reinier Melian · Accepted Answer · 2017-08-28T14:25:29.237

0

Use this extension with regex function to get only the numbers of your String

    extension String {

    func onlyNumbers() ->String{
        do{
            let regex = try NSRegularExpression(pattern: "([//.,\\d])*", options:[.dotMatchesLineSeparators])
            var result : String = ""

            for resultMatch in regex.matches(in: self, options: NSRegularExpression.MatchingOptions.init(rawValue: 0), range: NSMakeRange(0, NSString(string: self).length)) {
                result += NSString(string: self).substring(with: resultMatch.range)
            }
            return result
        }
        catch
        {

        }

        return ""
    }

}

you can use it like this

actionSheetController.addAction(
        UIAlertAction(title: NSLocalizedString("Past", comment: ""), style: .default, handler: { [weak self] _ in
            guard let strongSelf = self else { return }

            strongSelf.displayResultLabel.text = UIPasteboard.general.string.onlyNumbers()
            print ("Past")

        })
    )

edited Aug 28 '17 at 14:25

answered Aug 28 '17 at 14:02

Reinier Melian

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There are errors: Value of string "String?" has no member "onlyMembers" , Declaration is only valid at file scope – BLC Aug 28 '17 at 14:11
You need add the extension for String, did you do that? @BLC – Reinier Melian Aug 28 '17 at 14:22
@BLC the method is called onlyNumbers() not onlyMembers maybe is a typo please check this was tested before post – Reinier Melian Aug 28 '17 at 14:23
yes, you need to add this to your project is an extension for String – Reinier Melian Aug 28 '17 at 14:24
I added everything you wrote – BLC Aug 28 '17 at 14:27
can you post your code updated? you need add the extension out of any class scope @BLC – Reinier Melian Aug 28 '17 at 14:27
@BLC add a new file named StringExtension and there replace the code by my extension snippet and must work, please let me know – Reinier Melian Aug 28 '17 at 14:31
And what type of file to create ?? – BLC Aug 28 '17 at 14:35
did you figured it out? @BLC – Reinier Melian Aug 28 '17 at 15:34

Paste (Insert) into Label (IOS) only the numbers of String

1 Answers1