从 Struct 创建的数组中存储的选定表格单元格中播放音频

Posted 2023-02-24

【中文标题】从 Struct 创建的数组中存储的选定表格单元格中播放音频

【英文标题】：Playing audio from a selected table cell stored in an array created from a Struct

【发布时间】：2017-05-10 11:43:45

【问题描述】：

我有一个显示在表格中的环境声音列表，当您单击一个时，它会将您带到第二个视图控制器，该控制器显示声音标题，显示图像并给出环境声音的描述并显示播放按钮，我从 Struct 获取了数组中的所有数据，但在播放音频时遇到问题，这是我的代码示例：

我的结构：

import UIKit
import AVFoundation
import Foundation

struct Audio 
    var title: String
    var imageName: UIImage
    var descr: String
    var audioURL: String

我的视图控制器：

import UIKit
import AVFoundation

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate 

    let audios = [Audio(title: "Bubbling Pools", imageName: UIImage(named: ("1.png"))!, descr: "The stench of life fills the air. Viscous fluid bubbles to the surface in great exhortations of gas and moisture. Something about these pools is familiar..", audioURL: "2_Bubbling_Pools.mp3"),
                  Audio(title: "March Of Faith", imageName: UIImage(named: ("2.png"))!, descr: "The devoted stream into the distance. The dust from their sandaled feet blocks out the sun for miles around. There's no stopping them. They believe.", audioURL: "3_The_March_of_the_Faithful.mp3"),
                  Audio(title: "Solemn Vow", imageName: UIImage(named: ("3.png"))!, descr: "When death is near, and retreat is not an option. Only the bravest have any purchase on the word \"honor\".", audioURL: "4_Solemn_Vow-a.mp3")

public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 

        return audios.count
    

    public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 

        let cell = UITableViewCell()
        let audio = audios[indexPath.row]
        cell.textLabel?.text = audio.title

        return cell
    

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) 
        let audio = audios[indexPath.row]

        performSegue(withIdentifier: "segue", sender: audio)

    

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) 
        if segue.identifier == "segue" 

            let audio = sender as! Audio
            let destinationVC = segue.destination as! SecondViewController
            destinationVC.selectedAudio = audio
        
    

    @IBOutlet weak var tableView: UITableView!

    override var preferredStatusBarStyle: UIStatusBarStyle 
        return .lightContent
    

    override func viewDidLoad() 
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

    

我的第二个视图控制器：

import UIKit
import AVFoundation

class SecondViewController: UIViewController 

    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet weak var artworkImage: UIImageView!
    @IBOutlet weak var descriptionLabel: UILabel!
    @IBOutlet weak var playButton: UIButton!

    var selectedAudio: Audio!

    override var preferredStatusBarStyle: UIStatusBarStyle 
        return .lightContent
    

    override func viewDidLoad() 
        super.viewDidLoad()
        // Do any additional setup after loading the view.

        titleLabel.text = selectedAudio.title
        artworkImage.image = selectedAudio.imageName
        descriptionLabel.text = selectedAudio.descr

    

    @IBAction func playButtonPressed(_ sender: Any) 

        playAudio()

    

    var player: AVAudioPlayer?

    func playAudio() 
        let url = Bundle.main.url(forResource: selectedAudio.audioURL, withExtension: "mp3")!

        do 
            player = try AVAudioPlayer(contentsOf: url)
            guard let player = player else  return 

            player.prepareToPlay()
            player.play()
         catch let error 
            print(error.localizedDescription)
        
    

【问题讨论】：

你是否到达调用 player.play() 的地方（确保通过输出或断点）？

连接到上述内容：您是否确定 url 是您喜欢的（仅使用文件名似乎有问题）并且文件确实存在？

【参考方案1】：

尝试从audios 中的URL 中删除.mp3。 URLForResource:withExtension: 单独获取扩展名。