How to replace string in particular range in iOS Swift? - ios

Question

For example string = "Hello #manan123 and #man"
i am doing tagging functionality in textview and i want when user press backspace if word contains # then whole word will delete not single character.
but i am facing problem while two tagged word have same characters. So in above example when i am trying to delete last word #man then #manan123 also convert to the an123.
Here is my code on textview delegate method
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
if text == "" {
if let selectedRange = textView.selectedTextRange {
let cursorOffset = textView.offset(from: textView.beginningOfDocument, to: selectedRange.start)
if let myText = textView.text {
let index = myText.index(myText.startIndex, offsetBy: cursorOffset)
let substring = myText[..<index]
if let lastword = substring.components(separatedBy: " ").last {
if lastword.hasPrefix("#") {
//Check complete word
let completeLastword = myText.components(separatedBy: " ").filter{$0.contains(lastword)}.last
textView.text = myText.replacingOccurrences(of: completeLastword!, with: "")
return false
}
}
}
}
}
return true
}

Answer 1

Hi I have updated your code please check it.
if text == "" {
if let selectedRange = textView.selectedTextRange {
let cursorOffset = textView.offset(from: textView.beginningOfDocument, to: selectedRange.start)
if let myText = textView.text {
let index = myText.index(myText.startIndex, offsetBy: cursorOffset)
let substring = myText[..<index]
if let lastword = substring.components(separatedBy: " ").last {
if lastword.hasPrefix("#") {
var newText = myText
let start = newText.index(myText.startIndex, offsetBy: cursorOffset - lastword.count);
let end = newText.index(myText.startIndex, offsetBy: (cursorOffset - lastword.count) + lastword.count);
newText.replaceSubrange(start..<end, with: "")
textView.text = newText
return false
}
}
}
}
}
Hope this helps.