點擊表格視圖中的按鈕，歌曲將使用 swift 在每一行中播放

Question

我有一個歌曲列表，應該通過點擊按鈕在表格視圖的每一行中播放。 我在自定義單元格中制作了一個按鈕和一個協議，用於在我們的視圖控制器中顯示點擊。 例如。 當我們點擊單元格中的第二個按鈕時，它應該播放第二首歌曲，當我們點擊第三個按鈕時，它應該播放第三首歌曲。

我的視圖控制器：

import UIKit
import AVFoundation

class BeatPackViewController: UIViewController {
    
    @IBOutlet weak var beatTableView: UITableView!
    @IBOutlet weak var coverImage: UIImageView!
    @IBOutlet weak var looppackNameLabel: UILabel!
    @IBOutlet weak var producerNameLabel: UILabel!
    @IBOutlet weak var backButtonLabel: UIButton!

    let data = DataLoader().beatData
    var songs: [String] = []
    
    var audioPlayer = AVAudioPlayer()
    
    func getSongs() -> [String] {
        var names: [String] = []
        let path = Bundle.main.resourceURL?.appendingPathComponent("songs")
        do {
            let songs = try FileManager.default.contentsOfDirectory(at: path!, includingPropertiesForKeys: nil, options: FileManager.DirectoryEnumerationOptions.skipsHiddenFiles)
            
            for song in songs {
                let strArray = song.absoluteString.components(separatedBy: "/")
                var songName = strArray[strArray.count - 1].replacingOccurrences(of: "%20", with: " ")
                songName = songName.replacingOccurrences(of: ".wav", with: "")
                names.append(songName)
            }
        } catch {}
        
        return names
    }
    
    func playSong(index: Int) {
        do {
            let songPath = Bundle.main.path(forResource: songs[index], ofType: ".wav", inDirectory: "songs")
            try audioPlayer = AVAudioPlayer(contentsOf: URL(fileURLWithPath: songPath!))
            audioPlayer.play()
        } catch {}
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        beatTableView.delegate = self
        beatTableView.dataSource = self
        
        self.view.backgroundColor = SettingsService.sharedService.backgroundColor
        coverImage.layer.cornerRadius = 20
        coverImage.layer.shadowRadius = 7
        coverImage.layer.shadowOpacity = 0.8
        coverImage.layer.shadowOffset = CGSize(width: 3, height: 3)
        coverImage.layer.shadowColor = UIColor.black.cgColor
        coverImage.clipsToBounds = true
    }
    
}



extension BeatPackViewController: UITableViewDataSource, UITableViewDelegate {
    
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    
    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 80
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return data.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = beatTableView.dequeueReusableCell(withIdentifier: "firstLoopCell", for: indexPath as IndexPath) as! CustomLoopsCell
        cell.loopNameLabel.text = data[indexPath.row].loop_name
        cell.delegate = self
        cell.playButtonOutlet.addTarget(self, action: #selector(CustomLoopsCell.playButtonPressed(_:)), for: .touchUpInside)
        //        cell.instrumentLabel.text = data[indexPath.row].loops[indexPath.row].Instrument
        //        cell.producerLabel.text = data[indexPath.row].loops[indexPath.row].producer
        return cell
    }
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        didTapButton()
    }
    
}

extension BeatPackViewController: CustomLoopsDelegate {
    func didTapButton() {
    }
    
}

我的自定義單元格

import UIKit
import AVFoundation

protocol CustomLoopsDelegate: AnyObject {
    func didTapButton()
}

class CustomLoopsCell: UITableViewCell {
    
    weak var delegate: CustomLoopsDelegate?
    
    var songs: [String] = []
    
    var audioPlayer = AVAudioPlayer()
    
    
    @IBOutlet weak var loopNameLabel: UILabel!
    @IBOutlet weak var producerLabel: UILabel!
    @IBOutlet weak var instrumentLabel: UILabel!
    @IBOutlet weak var playButtonOutlet: UIButton!
    
    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }
    
    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)
        
        // Configure the view for the selected state
    }
    
    @IBAction func playButtonPressed(_ sender: UIButton) {
        delegate?.didTapButton()
    }
}

Answer 1

正如Paulw11所說，不要在cellForRowAt使用 btn 動作，您需要添加delegate 。 檢查代碼我試過關於你的。 在這里你不需要didSelect方法

BeatPackViewController.Swift

class BeatPackViewController: UIViewController, CustomLoopsDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell : CustomLoopsCell = tableView.dequeueReusableCell(withIdentifier: "firstLoopCell", for: indexPath) as! CustomLoopsCell
        cell.delegate = self
        return cell
    }
    
    func btnUseTap(cell: CustomLoopsCell) {
        let indexPath = self.tableview.indexPath(for: cell)
        //play song here
    }

}

CustomLoopsCell.Swift

protocol CustomLoopsDelegate: AnyObject {
    func btnUseTap(cell: CustomLoopsCell)
}

class CustomLoopsCell: UITableViewCell {
    
    weak var delegate: CustomLoopsDelegate?
    
    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }
    
    @IBAction func btnUse(_ sender: Any) {
        delegate?.btnUseTap(cell: self)
    }
    
}

更新歌曲播放代碼

let audioData = try! Data(contentsOf: url, options: .mappedIfSafe)
        try! AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback)
        try! AVAudioSession.sharedInstance().setActive(true)
        do {
            self.audioPlayer = try AVAudioPlayer(data: audioData, fileTypeHint: AVFileType.m4a.rawValue)
            self.audioPlayer.prepareToPlay()
            self.audioPlayer.play()
            if isVideoMute {
                self.audioPlayer.volume = 0
            }else {
                self.audioPlayer.volume = 1
            }
        } catch let error {
            print(error.localizedDescription)
        }