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UITextField accept only numbers to certain limits (Swift 5 Tested.)
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// let MAX_LENGTH_PHONENUMBER = 15 | |
// let ACCEPTABLE_NUMBERS = "0123456789" | |
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool { | |
let newLength: Int = textField.text!.count + string.count - range.length | |
let numberOnly = NSCharacterSet.init(charactersIn: ACCEPTABLE_NUMBERS).inverted | |
let strValid = string.rangeOfCharacter(from: numberOnly) == nil | |
return (strValid && (newLength <= MAX_LENGTH_PHONENUMBER)) | |
} |
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