Format UITextField text without having cursor move to the end

Question

I am trying to apply NSAttributedString styles to a UITextField after processing a new text entry, keystroke by keystroke. The problem is t

Answer 1

To complement the other correct answers in this thread here are some code snippets for Swift 4.2 and for both UITextField and UITextView

UITextField

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    // Update Cursor
    let positionOriginal = textField.beginningOfDocument
    let cursorLocation = textField.position(from: positionOriginal, offset: (range.location + string.count))
    if let cursorLocation = cursorLocation {
        textField.selectedTextRange = textField.textRange(from: cursorLocation, to: cursorLocation)
    }
    return false
}

UITextView

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
    // Update Cursor
    let positionOriginal = textView.beginningOfDocument
    let cursorLocation = textView.position(from: positionOriginal, offset: (range.location + text.count))
    if let cursorLocation = cursorLocation {
        textView.selectedTextRange = textView.textRange(from: cursorLocation, to: cursorLocation)
    }
    return false
}