增加手勢讓鍵盤隱藏

首先在您的viewDidLoad呼叫此方法，如下

override func viewDidLoad() {
    super.viewDidLoad()
    self.hideKeyboardWhenTappedAround()
}

extension UIViewController {
    func hideKeyboardWhenTappedAround() {
        let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(UIViewController.dismissKeyboard))
        //默認是true，若不關閉會無法觸發didSelect，看自身需求

        tap.cancelsTouchesInView = false
        view.addGestureRecognizer(tap)
    }
    
    func dismissKeyboard() {
        view.endEditing(true)
    }
}