Both TikTok & Instagram (iOS) have a mechanism built into their edit profile biography code which enables the user to use the return key and create separation lines in user's profile biographies. However, after a certain number of lines returned with no text in the lines, they prevent the user from using the return key again.
How can one do this?
I understand how to prevent the return key from being used if the present line the cursor is on is empty, using the following:
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
guard text.rangeOfCharacter(from: CharacterSet.newlines) == nil else {
return false
}
return true
Moreover, I need help figuring out how to detect, for example, that 4 lines are empty, and stating that if 4 lines are empty, preventing the user from using the return key.
This may need fine tuning for edge cases but this would be my starting point for sure. The idea is to check the last 4 inputs into the text view with the current input and decide what to do with it. This particular code would prevent the user from creating a fourth consecutive empty line.
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
if text == "\n",
textView.text.hasSuffix("\n\n\n\n") {
return false
}
return true
}