Clash Royale CLAN TAG#URR8PPP

Cursor goes to end after setting text to UITextField inside shouldChangeCharactersIn

I have text label which has phone number in it. I mask the phone number when user is typing so that in shouldChangeCharactersIn function;

shouldChangeCharactersIn

UITextField

UITextField

My question is that after I set text of UITextfield (delete or add new character UITextField, cursor moves to the end but I want it to stay in the same position. (By meaning same position, I mean same when I don't implement shouldChangeCharactersIn function) How can I do that? Thank you.

UITextfield

UITextField

shouldChangeCharactersIn

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool

guard CharacterSet(charactersIn: "0123456789").isSuperset(of: CharacterSet(charactersIn: string)) else
return false

if let text = textField.text
let newLength = text.count + string.count - range.length
let newText = text + string

let textFieldText: NSString = (textField.text ?? "") as NSString
let txtAfterUpdate = textFieldText.replacingCharacters(in: range, with: string)
if(newLength <= 15)
//textField.text = txtAfterUpdate
textField.text = txtAfterUpdate.digits.applyPatternOnNumbers()
return false

return newLength <= 15

return true



Mask Function:

func applyPatternOnNumbers(pattern: String = "(###) ### ## ##", replacmentCharacter: Character = "#") -> String
var pureNumber = self.replacingOccurrences( of: "[^0-9]", with: "", options: .regularExpression)
for index in 0 ..< pattern.count
guard index < pureNumber.count else return pureNumber
let stringIndex = String.Index(encodedOffset: index)
let patternCharacter = pattern[stringIndex]
guard patternCharacter != replacmentCharacter else continue
pureNumber.insert(patternCharacter, at: stringIndex)

return pureNumber



What I want in GIF

1 Answer
1

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool

guard CharacterSet(charactersIn: "0123456789").isSuperset(of: CharacterSet(charactersIn: string)) else
return false

if let text = textField.text
let newLength = text.count + string.count - range.length
let newText = text + string

let textFieldText: NSString = (textField.text ?? "") as NSString
let txtAfterUpdate = textFieldText.replacingCharacters(in: range, with: string)
if(newLength <= 15)

var currentPosition = 0
if let selectedRange = textField.selectedTextRange
currentPosition = textField.offset(from: textField.beginningOfDocument, to: selectedRange.start)


if(string == "")
if(currentPosition == 2)
if(textField.text!.count > 2)
currentPosition = 1
else
currentPosition = 0

else if(currentPosition == 7)
currentPosition = 4
else if(currentPosition == 11)
currentPosition = 9
else if(currentPosition == 14)
currentPosition = 12
else
if(currentPosition != 1)
currentPosition = currentPosition - 1


else
if(currentPosition == 0)
currentPosition = 2
else if(currentPosition == 4)
currentPosition = 7
else if(currentPosition == 9)
currentPosition = 11
else if(currentPosition == 12)
currentPosition = 14
else
currentPosition = currentPosition + 1



textField.text = txtAfterUpdate.applyPatternOnNumbers()
print("textField Length -> : (textField.text?.count ?? 0)")

if let newPosition = textField.position(from: textField.beginningOfDocument, offset: currentPosition)
textField.selectedTextRange = textField.textRange(from: newPosition, to: newPosition)


return false

return newLength <= 15

return true



By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.