I have a UITextField in which the user is expected to type a sentence which we tell the user to type. So the sentence to type is already known to us. Midway of the sentence, the user has to secretly pass a message. The way to do this is by typing a few letters of the already known sentence and then type '&' followed by WhichEverMessageUserWantsToPass and '&' to end.
The catch is the moment the user presses '&', whatever he types after that should not be displayed, instead each letter he types after that should be replaced by the letter in the already known sentence.
For example:
String - Which city did I live in 2 years ago?
User types - Which city di&Deteroit&n 2 yea
UITextField should show - Which city did I live in 2 yea
The part between the two '&' is essentially the answer by itself, so I do not want it to be shown in the text field.
My approach currently is:
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
var addString = String(self.character[self.textLength])
var start = textField.text.endIndex // Start at the string's end index as I only want the most recent character to be replaced
var end = textField.text.endIndex // Take the string's end index as I only want one character to be changes per type
var nextRange: Range<String.Index> = Range<String.Index>(start: start,end: end)
textField.text.stringByReplacingCharactersInRange(nextRange, withString: addString)
return true
}
However, this does not seem to replace any letter currently. Kindly help if any one knows the implementation. Thank you