Handling test changed events in a text field swift - ios

Question

I am building a small iOS application that involves doing certain things when text in a tex fields changes. I have been trying to figure out how I can write certain function to be called when the test changed event occurs but none of those solutions work for me, I believe they are outdated. the most popular solution is this:
textField.addTarget(self, action: #selector(textFieldDidChange(_:)), for: .editingChanged)
and
func textFieldDidChange(_ textField: UITextField) {
}
This solution was posted here: How do I check when a UITextField changes?
However when I try to implement this to my code I get an error saying that value of member UITextView has no member addTarget. I am not sure if the code is wrong or if I'm writing it in the wrong place, I am still learning swift so I'm sorry if there's an obvious error.
Here is my code:
import UIKit
class JournalEntryViewController: UIViewController
{
override func viewDidLoad() {
super.viewDidLoad()
print(RatingSelection.selectedSegmentIndex)
let date = NSDate()
let calendar = NSCalendar.current
let hour = calendar.component(.hour, from: date as Date)
let minutes = calendar.component(.minute, from: date as Date)
print("minutes: ",minutes)
if (minutes == 16)
{
print("got in!!!")
print(TextField.text)
}
func textFieldDidChange(_ textField: UITextField)
{
print("text changed")
}
// This line is the problem, I'm trying to add a text changed event to TextField
TextField.addTarget(self, action: #selector(textFieldDidChange(_:)), for: .editingChanged)
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBOutlet weak var TodaysDate: UILabel!
#IBOutlet weak var RateDayLabel: UILabel!
#IBOutlet weak var RatingSelection: UISegmentedControl!
#IBOutlet weak var TextField: UITextView!
}
EDIT:
I tried doing this, which is almost a copy of the solution but the statement still doesn't get printed when the text changes in the textview
class JournalEntryViewController: UIViewController, UITextViewDelegate
{
override func viewDidLoad()
{
super.viewDidLoad()
self.textField.delegate = self
func textViewDidChange(_ textView: UITextView)
{
print("text changed!!!")
}
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
}
#IBOutlet weak var textField: UITextView!
#IBOutlet weak var todaysDate: UILabel!
#IBOutlet weak var rateDayLabel: UILabel!
#IBOutlet weak var ratingSelection: UISegmentedControl!
}
Can anyone please help?
EDIT 2:
I figured out the problem, it wasn't in this code.
Thanks for the help!

Answer 1

Your TextField variable (which should be textField - use a lower case first letter for variables, upper case first letter for classes) is a UITextView, not a UITextField so you are attempting to use an incorrect solution.
For a UITextView you need to implement the appropriate UITextViewDelegate method:
class JournalEntryViewController: UIViewController, UITextViewDelegate
{
override func viewDidLoad()
{
super.viewDidLoad()
self.textField.delegate = self
}
func textViewDidChange(_ textView: UITextView) {
// Do whatever
}
}