UITextField function not available in UITextView - ios

Question

I'm having a problem with applying a textField function in terms of a textView.
Previously, I was using a textField and the below code was running smoothly without any problem. Now, I decided to use a textView instead of a textField, so want to change every textField to a textView but don't know how to implement the textField.addtarget() function to a textView. What I want is, initially, when the textView is empty the button color isn't enabled but when there is text in it, the button color should be blue.
I can't find a proper function that contains a #selector to call my main function in the textView functions. I'd appreciate any help. Thank you very much in advance!
override func viewDidLoad() {
super.viewDidLoad()
buttonColor.isEnabled = false
handleTextField()
}
func handleTextField() {
textField.addTarget(self, action: #selector(self.textFieldDidChange), for: UIControlEvents.editingChanged)
} // used to call the main function
#objc func textFieldDidChange() {
if (textView.text != ""){
buttonColor.setTitleColor(UIColor.blue, for: UIControlState.normal)
buttonColor.isEnabled = true
return
}
buttonColor.setTitleColor(UIColor.lightGray, for: UIControlState.normal)
buttonColor.isEnabled = false
}

Answer 1

You have a delegate for it in UITextViewDelegate called textViewDidChange(_:).
class ViewController: UIViewController, UITextViewDelegate {
override func viewDidLoad() {
super.viewDidLoad()
yourTextView.delegate = self
print(locationName) // not important
buttonColor.isEnabled = false // not important
}
//Your other code
func textViewDidChange(textView: UITextView) {
if (textView.text != ""){
buttonColor.setTitleColor(UIColor.blue, for: UIControlState.normal)
buttonColor.isEnabled = true
return
}
buttonColor.setTitleColor(UIColor.lightGray, for: UIControlState.normal)
buttonColor.isEnabled = false
}
}