ios - tableView(_ tableView : UITableView, didSelectRowAt indexPath: IndexPath) 当我将 UITapGestureRecognizer 添加到自定义 UITableViewCell 时不起作用

Question

我手头有一个非常原始的问题，那就是当我将点击手势识别器添加到我的自定义单元格时，我无法调用 didSelectRowAt 方法。

我的代码如下:

import UIKit

class LanguageViewController: UIViewController {

    @IBOutlet weak var titleLabel: AvenirUILabel!
    @IBOutlet weak var backButton: UIButton!
    @IBOutlet weak var submitButton: PinkUIButton!
    @IBOutlet weak var addLanguageButton: UIButton!
    @IBOutlet weak var addAnotherLanguageLabel: UILabel!
    @IBOutlet weak var tableView: UITableView!

    @IBOutlet weak var tableViewHeightConstraint: NSLayoutConstraint!

    var numberOfLanguagesSpoken = 2
    var pickersStartHeight: CGFloat!
    let downArrowImage = UIImage(named: "arrow_drop_down")
    let BGColor = UIColor.white.withAlphaComponent(0.1)
    var tag = 1001
    var selectedCellHeight: CGFloat = 88.0
    var unselectedCellHeight: CGFloat = 44.0
    var selectedCellIndexPath: IndexPath?
    let languages = ["Akan", "Amharic", "Arabic", "Assamese", "Awadhi", "Azerbaijani", "Balochi", "Belarusian", "Bengali", "Bhojpuri", "Burmese", "Cebuano", "Chewa", "Chhattisgarhi", "Chittagonian", "Czech", "Deccan", "Dhundhari", "Dutch", "Eastern Min", "English", "French", "Fula", "Gan Chinese", "German", "Greek", "Gujarati", "Haitian Creole", "Hakka", "Haryanvi", "Hausa", "Hiligaynon/Ilonggo", "Hindi ", "Hmong", "Hungarian", "Igbo", "Ilocano", "Italian", "Japanese", "Javanese", "Jin", "Kannada", "Kazakh", "Khmer", "Kinyarwanda", "Kirundi", "Konkani", "Korean", "Kurdish", "Madurese", "Magahi", "Maithili", "Malagasy", "Malay", "Malayalam", "Mandarin", "Marathi", "Marwari", "Mossi", "Nepali", "Northern Min", "Odia", "Oromo", "Pashto", "Persian", "Polish", "Portuguese", "Punjabi", "Quechua", "Romanian", "Russian", "Saraiki", "Serbo-Croatian", "Shona", "Sindhi", "Sinhalese", "Somali", "Southern Min", "Spanish", "Sundanese", "Swedish", "Sylheti", "Tagalog/Filipino", "Tamil", "Telugu", "Thai", "Turkish", "Turkmen", "Ukrainian", "Urdu", "Uyghur", "Uzbek", "Vietnamese", "Wu", "Xhosa", "Xiang ", "Yoruba", "Yue ", "Zhuang", "Zulu"]

    var proficiency = ["Basic","Conversational","Proficient","Fluent","Native"]

    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.backgroundColor = backgroundTint

        //  initial set up

        let height = self.view.bounds.height

        titleLabel.textColor = .white

        backButton.addTarget(self, action: #selector(goBack), for: .allTouchEvents)

        tableView.dataSource = self
        tableView.delegate = self
        tableView.register(LanguageProficiencyTableViewCell.self, forCellReuseIdentifier: "Language")
        tableView.backgroundColor = backgroundTint
        tableView.allowsSelection = true
        tableViewHeightConstraint.constant = 2*height/9


        addLanguageButton.tintColor = .white
        addLanguageButton.addTarget(self, action: #selector(addNewLanguage), for: .allTouchEvents)

        addAnotherLanguageLabel.textColor = .white

        submitButton.addTarget(self, action: #selector(submitChanges), for: .allEvents)
    }

    override func viewWillLayoutSubviews() {
        unselectedCellHeight = self.view.bounds.height/9
        selectedCellHeight = CGFloat(unselectedCellHeight * 2.0)
    }

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

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func goBack() {
        self.dismiss(animated: true, completion: nil)
    }

    func submitChanges() {
        self.dismiss(animated: true) {
            //
        }
    }

    func addNewLanguage() {
        numberOfLanguagesSpoken += 1
        UIView.animate(withDuration: 0.5) {
            //
        }
    }

    /*
     // MARK: - Navigation

     // In a storyboard-based application, you will often want to do a little preparation before navigation
     override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
     // Get the new view controller using segue.destinationViewController.
     // Pass the selected object to the new view controller.
     }
     */

}
extension LanguageViewController: UITableViewDataSource, UITableViewDelegate {

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return numberOfLanguagesSpoken
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Language", for: indexPath) as! LanguageProficiencyTableViewCell
        cell.parentVC = self
        cell.backgroundColor = .clear
        cell.languages = self.languages
        cell.proficiency = self.proficiency
        return cell
    }

    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        if selectedCellIndexPath == indexPath {
            return selectedCellHeight
        } else {
            return unselectedCellHeight
        }
    }

    func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
        //
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        if selectedCellIndexPath != nil && selectedCellIndexPath == indexPath as IndexPath {
            selectedCellIndexPath = nil
        } else {
            selectedCellIndexPath = indexPath as IndexPath
        }

        tableView.beginUpdates()
        tableView.endUpdates()

        if selectedCellIndexPath != nil {
            // This ensures, that the cell is fully visible once expanded
            tableView.scrollToRow(at: indexPath as IndexPath, at: .none, animated: true)
        }
    }

    func tableView(_ tableView: UITableView, willSelectRowAt indexPath: IndexPath) -> IndexPath? {
        return indexPath
    }
}

import UIKit

class LanguageProficiencyTableViewCell: UITableViewCell {

    let languageLabel = IndentedTextUILabel()
    var languagePicker = UIPickerView()
    weak var parentVC: LanguageViewController!
    var cellHeight: CGFloat = 80
    var open = false
    var languages = [""]
    var proficiency = [""]
    var pickedLanguage = ""
    var pickedProficiency = ""

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)

        self.contentView.addSubview(languageLabel)
        self.contentView.addSubview(languagePicker)
        self.contentView.backgroundColor = .clear
    }

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)!
    }

    override func layoutSubviews() {

        let width = self.bounds.width
        let height = cellHeight
        let BGColor = UIColor.white.withAlphaComponent(0.1)

        languageLabel.frame = CGRect(x: 0.0, y: 1.0, width: width, height: height - 1.0)
        languageLabel.textColor = .white
        languageLabel.backgroundColor = BGColor
        languageLabel.text = "Language(Proficiency)"
        languageLabel.leftInset = 25.0
        let downArrow = UIButton()
        let downArrowImage = UIImage(named: "arrow_drop_down")
        downArrow.setImage(downArrowImage, for: .normal)
        downArrow.center.y = height/2
        downArrow.center.x = 4 * width/5
        languageLabel.addSubview(downArrow)

        let tap = UITapGestureRecognizer(target: self, action: #selector(cellTapped))
        self.addGestureRecognizer(tap)

        languagePicker.frame = CGRect(x: 0.0, y: self.cellHeight + 1.0, width: self.bounds.width, height: 0.0)
        languagePicker.delegate = self
        languagePicker.dataSource = self
        languagePicker.backgroundColor = UIColor.white.withAlphaComponent(0.05)
        languagePicker.selectRow(20, inComponent: 0, animated: true)

        let backGroundView = UIView(frame: CGRect(x: 0.0, y: 1.0, width: width, height: height - 1.0))
        backGroundView.backgroundColor = .clear
        self.selectedBackgroundView = backGroundView
    }

    func cellTapped() {
        UIView.animate(withDuration: 0.2, animations: {
            if !self.open {
                self.languagePicker.frame.size.height = self.cellHeight - 2.0
            } else {
                self.languagePicker.isHidden = true
            }
            }, completion: { (_) in
                if self.open {
                    self.languagePicker.frame.size.height = 0.0
                    self.languagePicker.isHidden = false
                }
                self.open = !self.open
        })
    }
}

Answer 1

它不起作用，因为点击手势本身进行点击，而不是将点击发送到其下方的 View 。

您可以通过点击手势发送要传递到背景 View 的点击

mySwipeGesture.cancelsTouchesInView = false

如 How to pass a 'tap' to UIButton that is underneath UIView with UISwipeGestureRecognizer? 中所述

此外，如果您只是使用点击手势来关闭键盘，则可以在 tableView 的 didSelectAt 方法中执行此操作，并在该方法中关闭键盘后执行任何其他操作。