如何将长按手势识别器添加到 tableview 单元格内的按钮？答案

【问题标题】：How to add long press gesture recognizer to a button inside of tableview cell?如何将长按手势识别器添加到 tableview 单元格内的按钮？
【发布时间】：2016-11-24 12:45:55
【问题描述】：

我正在尝试将长按手势识别器添加到 tableview 单元格内的按钮。但我无法弄清楚我做错了什么。我希望我的按钮在用户点击并按住按钮时播放不同的音频文件。

我的代码

import UIKit
import AVFoundation

class ViewController6: UIViewController, UITableViewDataSource, UITableViewDelegate
{

    var player = AVQueuePlayer()


    @IBOutlet var tableView: UITableView!

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

    override func didReceiveMemoryWarning()
    {
        super.didReceiveMemoryWarning()
    }


//Functions for tableView

    //Cell - For Rifles

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

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
    {
        let cell6 = tableView.dequeueReusableCell(withIdentifier: "cell6", for: indexPath) as! ViewControllerTableViewCell6

        cell6.myImage.image = UIImage(named: arrayOfRifles[indexPath.row] + ".jpg")
        cell6.myButton.setTitle(buttonDataRifles[indexPath.row], for: UIControlState.normal)
        cell6.myButton.tag = indexPath.row
        cell6.myButton.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
        cell6.myButton.addGestureRecognizer(longPressGesture)
        return cell6

    }

    func longPressGesture() {
        let lpg = UILongPressGestureRecognizer(target: self, action: "longPress")
        lpg.minimumPressDuration = 0.5
    }

    func longPress(_ sender: UIButton) {
        if let url = Bundle.main.url(forResource: soundArrayRiflesUzun[(sender as AnyObject).tag], withExtension: "mp3")
        {
            player.removeAllItems()
            player.insert(AVPlayerItem(url: url), after: nil)
            player.play()

        }

    }

 //Action for Sounds


    @IBAction func buttonAction(_ sender: UIButton)
    {

        if let url = Bundle.main.url(forResource: soundArrayRifles[sender.tag], withExtension: "mp3")
        {
            player.removeAllItems()
            player.insert(AVPlayerItem(url: url), after: nil)
            player.play()

        }

    }

}

我在这一行遇到错误

cell6.myButton.addGestureRecognizer(longPressGesture)

【问题讨论】：

错误说明了什么？

标签： ios swift uilongpressgesturerecogni

【解决方案1】：

这样做，

cell6.myButton.addTarget(self, action: #selector(ViewController6.buttonAction(_:)), for: .touchUpInside)
cell6.myButton.addGestureRecognizer(self.longPressGesture())

func longPressGesture() -> UILongPressGestureRecognizer {
    let lpg = UILongPressGestureRecognizer(target: self, action: #selector(ViewController6.longPress))
    lpg.minimumPressDuration = 0.5
    return lpg
}

func longPress(_ sender: UILongPressGestureRecognizer) {
    if let url = Bundle.main.url(forResource: soundArrayRiflesUzun[sender.view.tag], withExtension: "mp3")
    {
        player.removeAllItems()
        player.insert(AVPlayerItem(url: url), after: nil)
        player.play()

    }

}

【讨论】：

谢谢你，成功了。但是当我松开按钮时，音频文件又开始播放了。你知道如何解决这个问题吗？
也修复了这个问题。我添加了 'if sender.state == UIGestureRecognizerState.began' 和 'if sender.state == UIGestureRecognizerState.ended' 再次非常感谢您的帮助

【解决方案2】：

让你的方法返回lpg:

func longPressGesture() -> UILongPressGestureRecognizer {
    let lpg = UILongPressGestureRecognizer(target: self, action: "longPress")
    lpg.minimumPressDuration = 0.5
    return lpg
}

然后这样称呼它：

...
cell6.myButton.addGestureRecognizer(longPressGesture())
    return cell6

}

【讨论】：