由于tapGestureRecognizer

Question

我正在使用swift 3.0中的一个项目，我有UIViewController来填充几个文本字段。因此，我使用表格视图作为下拉菜单，一旦选择了一行，它将被分配给UILabel。此外，我添加了一个UITapGuestureRecognizer方法，以确保在点击屏幕后隐藏键盘。不幸的是，由于这种方法，我的didSelectRow无法正常工作，实际上一旦点击一行，该名称将不会被分配给UILable。但是，当我消除UITapGusture方法时，它工作正常。我该如何解决这个问题？代码如下所示。

import UIKit
import CoreData

class AddRecurringExpensesViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

@IBOutlet weak var selectCategoryLabel: UILabel!

@IBOutlet weak var expenseNameTextField: UITextField!
@IBOutlet weak var amountTextField: UITextField!
@IBOutlet weak var toTextField: UITextField!
@IBOutlet weak var fromTextField: UITextField!

@IBOutlet weak var recurringexpenseTypeTableView: UITableView!

@IBOutlet weak var fromDatePicker: UIDatePicker!
@IBOutlet weak var fromDatePickerView: UIView!

@IBOutlet weak var toDatePickerView: UIView!
@IBOutlet weak var toDatePicker: UIDatePicker!





 var selectCategoryArray = ["Entertainment", "Food", "Membership", "Misc", "Purchase", "Subscription", "Transport", "Utility", "Other"]


 override func viewDidLoad() {
    super.viewDidLoad()
    self.fromDatePickerView.isHidden = true
    self.toDatePickerView.isHidden = true
    self.recurringexpenseTypeTableView.isHidden = true

    let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(AddRecurringExpensesViewController.dismissKeyboard))
    view.addGestureRecognizer(tap)

  }
 func dismissKeyboard() {
    //Causes the view (or one of its embedded text fields) to resign the first responder status.
    view.endEditing(true)
  }
  func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return selectCategoryArray.count
  }

  func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = UITableViewCell ()

    cell.textLabel?.text = selectCategoryArray[indexPath.row]
    return cell
  }


  func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {


    self.selectCategoryLabel.text = selectCategoryArray[indexPath.row]

    print("selected row is \(selectCategoryLabel.text)")


    self.recurringexpenseTypeTableView.isHidden = true
  }
  @IBAction func selectCategoryButtonPressed(_ sender: AnyObject) {
     self.recurringexpenseTypeTableView.isHidden = false
  }

  @IBAction func fromDateButtonPressed(_ sender: AnyObject) {

    self.fromDatePickerView.isHidden = false
  }

  @IBAction func fromDateAddedButtonPressed(_ sender: AnyObject) {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "dd MMM yyyy"
    fromTextField.text = dateFormatter.string(from:fromDatePicker.date)
    self.fromDatePickerView.isHidden = true
  }

  @IBAction func toDateButtonPressed(_ sender: AnyObject) {
    self.toDatePickerView.isHidden = false
  }

  @IBAction func toDateAddedButtonPressed(_ sender: AnyObject) {
    let dateFormatter = DateFormatter ()
    dateFormatter.dateFormat = "dd MMM yyyy"
    toTextField.text = dateFormatter.string(from: toDatePicker.date)
    self.toDatePickerView.isHidden = true
  }

Answer 1

修改你的消除键盘功能，如下所示，

func dismissKeyboard() {
  if self.recurringexpenseTypeTableView.isHidden == true {
     view.endEditing(true)
   }
}

Answer 2

你是对的，由于tapGestureRecognizer，DidSelectRow方法将被禁用。 您可以尝试在'touchsbegin'中执行'view.endEditing（true）'，记得重写super func。当UITableview存在时，不要使用tapGestureRecognizer。

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

Answer 3

您可以将它们视为彼此重叠的图层。 使用UITapGuestureRecognizer，您添加了一个新图层。当用户按下屏幕时，将调用顶层（UITapGuestureRecognizer）。它下面的图层不会被调用。

对于这种情况，我建议您删除UITapGuestureRecognizer图层。并在DidSelectRow中添加键盘的消除。