maxprig / stringformatter

Simple Text Formetter (Credit Card Number, Phone Number, Serial Number etc.) Can be used in all text inputs according to the format pattern. If desired, large minor character restrictions can be made in the format pattern.

StringFormatter

Simple Text Formetter (Credit Card Number, Phone Number, Serial Number etc.) Can be used in all text inputs according to the format pattern. If desired, large minor character restrictions can be made in the format pattern.

Display Visual Example

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Installation

To use the StringFormatter extension in an app, just drag the StringFormatter extension file (demo files and assets are not needed) into your project.

Methods

The StringFormatter extension has the following methods (note: for iOS, String in method arguments):

• func format(_ format: String, oldString: String) -> String

Formatting method according to given format pattern. oldString can be empty(""), but the final character formatting may not work smoothly.

• func unformat(_ format: String, oldString: String) -> String

Unformatting method according to given format pattern. oldString can be empty(""), but the final character unformatting may not work smoothly.

How to use ?

If the text format is entered uppercase, the character input from the keyboard is displayed as a upper case character.

'x' or 'X' -> Any character

'c' or 'C' -> Alphabetic character

'n' or 'N' -> Numerical character

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

guard let text = textField.text else {
return true
}
let lastText = (text as NSString).replacingCharacters(in: range, with: string) as String

if textfieldPhoneNumber == textField {
textField.text = lastText.format("(NNN) NNN NN NN", oldString: text)
return false
} else if textfieldCreditCard == textField {
textField.text = lastText.format("nnnn nnnn nnnn nnnn", oldString: text)
return false
} else if textfieldSerialNumber == textField {
textField.text = lastText.format("XX NNNN", oldString: text)
return false
}
return true
}
}

Build and run the project files. Enjoy more examples!