Swift: recognize when UITextField is tapped

Question

I am new to swift and have been stuck on this for hours. I am trying to recognize when a UITextField is tapped by the user, and call some function. For some reason I keep getting "unrecognized selector sent to instance". Here is my attempt at a solutionand Here is the error thrown

Any help is greatly appreciated!

Answer 1

Your selector is not pointing to the method! Try this instead:

textField.addTarget(self, action: #selector(ViewController.tapped(_:)), for: UIControlEvents.touchDown)

Also, instead of this approach you could also set ViewController as the delegate for textField and implement this:

extension ViewController: UITextFieldDelegate {
    func textFieldDidBeginEditing(_ textField: UITextField) {
        print("tapped")
        textField.backgroundColor = UIColor.blue
    }
}

Answer 2

Use: action: #selector(ViewController.tapped())

Also, below that, add this: self.textField.delegate = self

Answer 3

you can simply perform you action in UITexFieldDelegate, by making

myTextField.delegate = self

and use the method

optional public func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool{
//perform you action here
return true
}

Answer 4

instead of finding a way to get tap event you can use textFieldDidBeginEditing function:

class ViewController: UIViewController, UITextFieldDelegate
{
@IBOutlet weak var textField: UITextField!


override func viewDidLoad() {
    super.viewDidLoad()
    textField.delegate = self;
    // Do any additional setup after loading the view, typically from a nib.
}
 func textFieldDidBeginEditing(textField: UITextField) {
 print("TextField did begin editing method called")
 }
 func textFieldDidEndEditing(textField: UITextField) {
 print("TextField did end editing method called")
 }

}