I want to check if the user types specific phrases in a UITextView for a science app. I have this current code that creates a string of the last 20 characters then checks if that string contains a word in the arrayOfWords which gets performed on textViewDidChange:
var arrayOfWords = [“Gold", “Phosphorus”]
func textViewDidChange(_ textField: UITextView) {
if let selectedRange = textView.selectedTextRange {
let cursorPosition = textView.offset(from: textView.beginningOfDocument, to: selectedRange.start)
let startRange = cursorPosition - 20
let result = textView.text.substring(from: startRange, to: cursorPosition)
checkIfContains(textViewString: result)
}}
func checkIfContains(textViewString: String) {
if arrayOfWords.contains(where: textViewString.contains) {
doAction()
}
}
I know this is a very specific function so any ideas on how I could go about achieving this would be greatly appreciated.
Try to look at a regular expression (REGEX).
In your case the regex should look like "([A-Za-z]\w+ [1-9]\.[1-9]*) " ( note the space at the end )
Then in your textViewDidChange, as soon as the text matches the regex you can trigger your fetching method, and considering there is a space at the end it will only trigger when the user press space as you said.
Here is a link to try your regex : https://regexr.com/
And here is an example of using regex in swift : https://stackoverflow.com/a/27880748/5464805