swift - touchesBegan 在我的代码中没有响应

Question

//
//  CommentViewController.swift
//  Bordy
//
//  Created by Micheal Tyler on 9/22/17.
//  Copyright © 2017 Bordy,LLC. All rights reserved.
//

import UIKit
import FirebaseDatabase
import FirebaseAuth
class CommentViewController: UIViewController {

    @IBOutlet weak var commentTextField: UITextField!
    @IBOutlet weak var sendButton: UIButton!
    @IBOutlet weak var tableView: UITableView!
    @IBOutlet weak var constraintToBottom: NSLayoutConstraint!

    let postId = "-KuXb-8C5kijYNqOOihB"
    var comments = [Comment]()
    var users = [Users]()

    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.dataSource = self
        tableView.estimatedRowHeight = 77
        tableView.rowHeight = UITableViewAutomaticDimension
        empty()
        handleTextField()
        loadComments()

        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide(_:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
    }

/* 这是我放置代码的地方，当我在模拟器中点击屏幕时，不会打印任何内容，如果用户单击屏幕退出 textField，我的键盘也不会隐藏。 */

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        view.endEditing(true)
        print("12121")
    }

Answer 1

由于您在此处使用的是表格 View ，因此您的表格 View 的 ScrollView 很可能会在您的 View 获得触摸之前吸收触摸。

如果您想在用户点击您的表格 View 时隐藏键盘，您可以考虑使用 UITapGestureRecognizer 代替:

 // MARK: LifeCycle

 override func viewDidLoad() {
    super.viewDidLoad()

    tableView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleHideKeyboard)))
 }

 // MARK: User Interaction

 func handleHideKeyboard() {
    commentTextField.resignFirstResponder()
 }

请注意，您可以使用 resignFirstResponder() 方法来隐藏您的键盘:

resignFirstResponder()

Notifies this object that it has been asked to relinquish its status as first responder in its window.