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将GestureRecognizer添加到UIView不会触发操作

uitapgesturerecognizer swift ios

Tom A · 技术社区 · 8 年前

我不知道为什么这个手势识别器不能正常工作:

class SlideInMenuLauncher: NSObject, UITableViewDelegate, UITableViewDataSource {

  fileprivate let dimmerView = UIView()
  fileprivate let tableView: UITableView = {
    let tbv = UITableView(frame: .zero)
    return tbv
  }()
  fileprivate let resourceArray: [Content]
  weak var delegate: SlideInMenuDelegate?

  let cellIdentifier = "SlideInMenuTableViewCell"

  init(withContentArray contentArray: [Content]) {

    resourceArray = contentArray

    super.init()

    tableView.dataSource = self
    tableView.delegate = self

    tableView.register(UINib(nibName: cellIdentifier, bundle: nil), forCellReuseIdentifier: cellIdentifier)
  }

  func showMenu() {
    if let window = UIApplication.shared.keyWindow {
      dimmerView.backgroundColor = UIColor(white: 0, alpha: 0.5)

      dimmerView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(dismissMenu)))
      dimmerView.isUserInteractionEnabled = true

      window.addSubview(dimmerView)
      window.addSubview(tableView)

      let height: CGFloat = 200
      let y = window.frame.height - height
      tableView.frame = CGRect(x: 0, y: window.frame.height, width: window.frame.width, height: height)

      dimmerView.frame = window.frame
      dimmerView.alpha = 0

      UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
        self.dimmerView.alpha = 1
        self.tableView.frame = CGRect(x: 0, y: y, width: self.tableView.frame.width, height: self.tableView.frame.height)
      }, completion: nil)

    }
  }

  func dismissMenu() {
    UIView.animate(withDuration: 0.5) {
      self.dimmerView.alpha = 0

      if let window = UIApplication.shared.keyWindow {
        self.tableView.frame = CGRect(x: 0, y: window.frame.height, width: self.tableView.frame.width, height: self.tableView.frame.height)
      }
    }
  }

我在dismissMenu函数中放置了一个断点,但它从未被触发。也许我疲惫的眼睛(和思想)错过了一些简单的东西?

///Some other VC
let slideInMenuLauncher = SlideInMenuLauncher(withContentArray: [content])
slideInMenuLauncher.showMenu()

5 回复 | 直到 7 年前

Duncan C 8 年前

我希望这会导致编译器错误。你错过了 @objc 关于你的声明 dismissMenu()

编辑:

下面是我创建的测试项目的代码:

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var tapView: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()

        tapView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleTap)))
        tapView.isUserInteractionEnabled = true
    }

    @objc func handleTap() {
        print("You tapped on the view")
    }
}

Enrico Susatyo 8 年前

你能试着代替这个吗

window.addSubview(dimmerView)
window.addSubview(tableView)

执行以下操作:

window.addSubview(dimmerView)
window.addSubview(tableView)
window.bringSubviewToFront(dimmerView)

Steven Gardner 8 年前

let tapGes = UITapGestureRecognizer(target: self, action:#selector(dismissMenu))
    tapGes.delegate = self
    dimmerView.addGestureRecognizer(tapGes)

希望对你有帮助!

Caleb 8 年前

我想你的问题是:

dimmerView.alpha = 0

alpha 设置为 0 0.5 只是想看看它是否有效,然后拨回一个更小的值,这个值仍然大于 0个 .

Tom A 7 年前

所以我发现了问题多亏了这个 post

将对象设置为强属性修复了此问题。