允许在点击UITextView时执行操作

let tapGesture = UITapGestureRecognizer(target: self, action: #selector(textViewTapped))
textView.addGestureRecognizer(tapGesture)

@objc func textViewTapped() {
    // 执行操作
}

class ViewController: UIViewController, UITextViewDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        textView.delegate = self
    }
    
    func textViewDidBeginEditing(_ textView: UITextView) {
        // 执行操作
    }
}

NotificationCenter.default.addObserver(self, selector: #selector(textViewDidBeginEditing), name: UITextView.textDidBeginEditingNotification, object: nil)

@objc func textViewDidBeginEditing() {
    // 执行操作
}